| 1990 | ATL | Atlanta Braves | MLB-NL | MLB | team page | 162 | 65 | 97 | 26.0 | 682 | 821 | -139 | 6 | 12 | Bobby Cox, Russ Nixon | Atlanta-Fulton County Stadium | dnq |
| 1990 | ATL | Richmond Braves | IL | AAA | team page | 145 | 71 | 74 | 15.5 | 559 | 556 | 3 | 3 | 4 | Jim Beauchamp | The Diamond | dnq |
| 1990 | ATL | Greenville Braves | Sou | AA | team page | 144 | 57 | 87 | 28.0 | 586 | 722 | -136 | 5 | 10 | Buddy Bailey | Greenville Municipal Stadium | dnq |
| 1990 | ATL | Durham Bulls | Caro | A+ | team page | 139 | 71 | 68 | 19.0 | 603 | 622 | -19 | 3 | 4 | Grady Little | Durham Athletic Park | dnq |
| 1990 | ATL | Burlington Braves | Midw | A | team page | 137 | 78 | 59 | 11.5 | 646 | 570 | 76 | 3 | 4 | Jim Saul | Community Field | dnq |
| 1990 | ATL | Sumter Braves | SAL | A | team page | 142 | 73 | 69 | 9.5 | 607 | 529 | 78 | 4 | 7 | | Riley Park | dnq |
| 1990 | ATL | Gulf Coast Braves | GCL | Rk | team page | 62 | 33 | 29 | 6.5 | 267 | 287 | -20 | 3 | 6 | | West Palm Beach Municipal Stadium | dnq |
| 1990 | ATL | Idaho Falls Braves | Pio | Rk | team page | 70 | 39 | 31 | 4.0 | 395 | 426 | -31 | 2 | 4 | Steve Curry | McDermott Field | dnq |
| 1990 | ATL | Pulaski Braves | App | Rk | team page | 72 | 37 | 35 | 16.5 | 361 | 334 | 27 | 5 | 5 | Randy Ingle | Calfee Park | dnq |
| 1990 | BAL | Baltimore Orioles | MLB-AL | MLB | team page | 161 | 76 | 85 | 11.5 | 669 | 698 | -29 | 5 | 10 | Frank Robinson | Memorial Stadium | dnq |
| 1990 | BAL | Rochester Red Wings | IL | AAA | team page | 145 | 89 | 56 | -- | 735 | 621 | 114 | 1 | 1 | Greg Biagini | Silver Stadium | dnq |
| 1990 | BAL | Hagerstown Suns | East | AA | team page | 138 | 67 | 71 | 11.5 | 566 | 531 | 35 | 6 | 6 | Jerry Narron | Municipal Stadium | dnq |
| 1990 | BAL | Frederick Keys | Caro | A+ | team page | 136 | 74 | 62 | -- | 611 | 517 | 94 | 1 | 3 | Wally Moon | Harry Grove Stadium | League Champions |
| 1990 | BAL | Wausau Timbers | Midw | A | team page | 136 | 49 | 87 | 29.0 | 461 | 723 | -262 | 6 | 14 | Mike Young | Athletic Park | dnq |
| 1990 | BAL | Bluefield Orioles | App | Rk | team page | 70 | 38 | 32 | 14.5 | 336 | 344 | -8 | 4 | 4 | Gus Gil | Bowen Field at Peters Park | dnq |
| 1990 | BOS | Boston Red Sox | MLB-AL | MLB | team page | 162 | 88 | 74 | -- | 699 | 664 | 35 | 1 | 3 | Joe Morgan | Fenway Park | Lost ALCS (Athletics) |
| 1990 | BOS | Pawtucket Red Sox | IL | AAA | team page | 146 | 62 | 84 | 27.5 | 673 | 741 | -68 | 3 | 7 | Edward Nottle, Johnny Pesky | McCoy Stadium | dnq |
| 1990 | BOS | New Britain Red Sox | East | AA | team page | 139 | 72 | 67 | 7.0 | 506 | 514 | -8 | 4 | 4 | Butch Hobson | Beehive Field | Lost in Finals |
| 1990 | BOS | Lynchburg Red Sox | Caro | A+ | team page | 138 | 58 | 80 | 17.0 | 549 | 678 | -129 | 3 | 6 | Gary Allenson | Lynchburg City Stadium | dnq |
| 1990 | BOS | Winter Haven Red Sox | FSL | A+ | team page | 134 | 40 | 94 | 44.0 | 439 | 680 | -241 | 4 | 14 | Dave Holt | Chain of Lakes Park | dnq |
| 1990 | BOS | Elmira Pioneers | NYPL | A- | team page | 77 | 32 | 45 | 19.0 | 315 | 379 | -64 | 3 | 10 | Mike Verdi | Dunn Field | dnq |
| 1990 | BOS | Gulf Coast Red Sox | GCL | Rk | team page | 63 | 34 | 29 | 4.0 | 341 | 311 | 30 | 3 | 5 | Felix Maldonado | Chain of Lakes Park | dnq |
| 1990 | CAL | California Angels | MLB-AL | MLB | team page | 162 | 80 | 82 | 23.0 | 690 | 706 | -16 | 4 | 6 | Doug Rader | Anaheim Stadium | dnq |
| 1990 | CAL | Edmonton Trappers | PCL | AAA | team page | 141 | 78 | 63 | -- | 729 | 642 | 87 | 1 | 2 | Max Oliveras | John Ducey Park | Lost in Finals |
| 1990 | CAL | Midland Angels | Tex | AA | team page | 136 | 56 | 80 | 23.0 | 709 | 848 | -139 | 4 | 7 | Eduardo Rodriguez | Angels Stadium | dnq |
| 1990 | CAL | Palm Springs Angels | Calif | A+ | team page | 142 | 62 | 80 | 28.5 | 598 | 705 | -107 | 4 | 8 | Nate Oliver | Palm Springs Stadium | dnq |
| 1990 | CAL | Quad Cities Angels | Midw | A | team page | 140 | 81 | 59 | 10.0 | 660 | 519 | 141 | 2 | 2 | Don Long | John O'Donnell Stadium | League Champions |
| 1990 | CAL | Boise Hawks | Nwst | A- | team page | 76 | 53 | 23 | -- | 425 | 250 | 175 | 1 | 1 | Tom Kotchman | Memorial Stadium | Lost in Finals |
| 1990 | CAL | Arizona Angels | Ariz | Rk | team page | 55 | 19 | 36 | 18.0 | 280 | 351 | -71 | 6 | 6 | Bill Lachemann | Gene Autry Park | dnq |
| 1990 | CHN | Chicago Cubs | MLB-NL | MLB | team page | 162 | 77 | 85 | 18.0 | 690 | 774 | -84 | 5 | 8 | Don Zimmer | Wrigley Field | dnq |
| 1990 | CHN | Iowa Cubs | Amer | AAA | team page | 146 | 72 | 74 | -- | 642 | 694 | -52 | 0 | 5 | Jim Essian | Sec Taylor Stadium | dnq |
| 1990 | CHN | Charlotte Knights | Sou | AA | team page | 144 | 65 | 79 | 20.0 | 583 | 642 | -59 | 4 | 9 | Jay Loviglio | Knights Stadium | dnq |
| 1990 | CHN | Winston-Salem Spirits | Caro | A+ | team page | 140 | 86 | 54 | 4.5 | 674 | 540 | 134 | 2 | 2 | Brad Mills | Ernie Shore Field | dnq |
| 1990 | CHN | Peoria Chiefs | Midw | A | team page | 137 | 55 | 82 | 34.5 | 532 | 610 | -78 | 8 | 13 | Greg Mahlberg | Meinen Field | dnq |
| 1990 | CHN | Geneva Cubs | NYPL | A- | team page | 77 | 51 | 26 | -- | 421 | 283 | 138 | 1 | 2 | Bill Hayes | McDonough Park | Lost in Semi-Finals |
| 1990 | CHN | Huntington Cubs | App | Rk | team page | 69 | 40 | 29 | 12.0 | 307 | 276 | 31 | 3 | 2 | Steve Roadcap | St. Cloud Commons | dnq |
| 1990 | CHA | Chicago White Sox | MLB-AL | MLB | team page | 162 | 94 | 68 | 9.0 | 682 | 633 | 49 | 2 | 2 | Jeff Torborg | Comiskey Park | dnq |
| 1990 | CHA | Vancouver Canadians | PCL | AAA | team page | 141 | 74 | 67 | 4.0 | 681 | 628 | 53 | 3 | 5 | Marv Foley | Nat Bailey Stadium | dnq |
| 1990 | CHA | Birmingham Barons | Sou | AA | team page | 144 | 77 | 67 | 2.0 | 770 | 717 | 53 | 2 | 4 | Ken Berry | Hoover Metropolitan Stadium | Lost in Semi-Finals |
| 1990 | CHA | Sarasota White Sox | FSL | A+ | team page | 138 | 63 | 75 | 22.0 | 532 | 575 | -43 | 3 | 8 | Tony Franklin | Ed Smith Stadium | dnq |
| 1990 | CHA | South Bend White Sox | Midw | A | team page | 134 | 77 | 57 | -- | 611 | 553 | 58 | 1 | 3 | Richard Patterson | Stanley Covelski Regional Stadium | Lost in Finals |
| 1990 | CHA | Utica Blue Sox | NYPL | A- | team page | 78 | 31 | 47 | 21.0 | 311 | 382 | -71 | 4 | 12 | Tommy Thompson | Donovan Stadium at Murnane Field | dnq |
| 1990 | CHA | Gulf Coast White Sox | GCL | Rk | team page | 63 | 21 | 42 | 19.0 | 216 | 290 | -74 | 8 | 14 | Mike Gellinger | Ed Smith Stadium | dnq |
| 1990 | CIN | Cincinnati Reds | MLB-NL | MLB | team page | 162 | 91 | 71 | -- | 693 | 597 | 96 | 1 | 3 | Lou Piniella | Riverfront Stadium | Won World Series (Athletics) |
| 1990 | CIN | Nashville Sounds | Amer | AAA | team page | 147 | 86 | 61 | -- | 625 | 572 | 53 | 0 | 2 | Pete Mackanin | Herschel Greer Stadium | Lost in Finals |
| 1990 | CIN | Chattanooga Lookouts | Sou | AA | team page | 144 | 66 | 78 | 13.0 | 642 | 705 | -63 | 5 | 8 | Jim Tracy | Engel Stadium | dnq |
| 1990 | CIN | Cedar Rapids Reds | Midw | A | team page | 134 | 88 | 46 | -- | 562 | 430 | 132 | 1 | 1 | Dave Miley | Veterans Field | Lost in Semi-Finals |
| 1990 | CIN | Charleston (Wv) Wheelers | SAL | A | team page | 143 | 77 | 66 | 5.0 | 657 | 528 | 129 | 3 | 5 | Jim Lett | Walt Powell Park | League Champions |
| 1990 | CIN | Billings Mustangs | Pio | Rk | team page | 66 | 32 | 34 | 15.0 | 391 | 380 | 11 | 3 | 6 | | Cobb Field | dnq |
| 1990 | CIN | Gulf Coast Reds | GCL | Rk | team page | 63 | 36 | 27 | 2.0 | 293 | 278 | 15 | 2 | 3 | Sam Mejias | Plant City Stadium | dnq |
| 1990 | CLE | Cleveland Indians | MLB-AL | MLB | team page | 162 | 77 | 85 | 11.0 | 732 | 737 | -5 | 4 | 9 | John McNamara | Cleveland Stadium | dnq |
| 1990 | CLE | Colorado Springs Sky Sox | PCL | AAA | team page | 143 | 76 | 67 | 15.5 | 811 | 834 | -23 | 2 | 3 | Charlie Manuel | Sky Sox Stadium | Lost in Semi-Finals |
| 1990 | CLE | Canton/Akron Indians | East | AA | team page | 140 | 76 | 64 | 3.5 | 555 | 528 | 27 | 2 | 3 | Ken Bolek | Thurman Munson Memorial Stadium | Lost in Semi-Finals |
| 1990 | CLE | Kinston Indians | Caro | A+ | team page | 135 | 88 | 47 | -- | 697 | 509 | 188 | 1 | 1 | Brian Graham | Grainger Stadium | Lost in Finals |
| 1990 | CLE | Watertown Indians | NYPL | A- | team page | 77 | 43 | 34 | 8.5 | 369 | 303 | 66 | 3 | 4 | Jim Gabella | Duffy Fairgrounds | dnq |
| 1990 | CLE | Burlington Indians | App | Rk | team page | 72 | 35 | 37 | 18.5 | 337 | 325 | 12 | 6 | 6 | Dave Keller | Burlington Athletic Stadium | dnq |
| 1990 | CLE | Gulf Coast Indians | GCL | Rk | team page | 63 | 23 | 40 | 15.0 | 242 | 353 | -111 | 6 | 13 | Dean Treanor | Sarasota | dnq |
| 1990 | DET | Detroit Tigers | MLB-AL | MLB | team page | 162 | 79 | 83 | 9.0 | 750 | 754 | -4 | 3 | 7 | Sparky Anderson | Tiger Stadium | dnq |
| 1990 | DET | Toledo Mud Hens | IL | AAA | team page | 144 | 58 | 86 | 28.0 | 589 | 665 | -76 | 4 | 8 | Tom Gamboa, John Wockenfuss | Ned Skeldon Stadium | dnq |
| 1990 | DET | London Tigers | East | AA | team page | 139 | 76 | 63 | 3.0 | 549 | 533 | 16 | 3 | 2 | Chris Chambliss | Labatt Memorial Park | League Champions |
| 1990 | DET | Lakeland Tigers | FSL | A+ | team page | 132 | 83 | 49 | -- | 549 | 406 | 143 | 1 | 2 | Johnny Lipon | Joker Marchant Stadium | Lost in Semi-Finals |
| 1990 | DET | Fayetteville Generals | SAL | A | team page | 143 | 82 | 61 | -- | 601 | 552 | 49 | 1 | 3 | Gene Roof | J.P. Riddle Stadium | Lost in Semi-Finals |
| 1990 | DET | Niagara Falls Rapids | NYPL | A- | team page | 77 | 35 | 42 | 9.0 | 295 | 388 | -93 | 4 | 9 | Aurelio Rodriguez | Sal Maglie Stadium | dnq |
| 1990 | DET | Bristol Tigers | App | Rk | team page | 68 | 22 | 46 | 29.5 | 224 | 340 | -116 | 10 | 10 | Ken Cunningham | Devault Memorial Stadium | dnq |
| 1990 | HOU | Houston Astros | MLB-NL | MLB | team page | 162 | 75 | 87 | 16.0 | 573 | 656 | -83 | 5 | 10 | Art Howe | Astrodome | dnq |
| 1990 | HOU | Tucson Toros | PCL | AAA | team page | 142 | 71 | 71 | 20.0 | 768 | 781 | -13 | 3 | 6 | Bob Skinner | Hi Corbett Field | dnq |
| 1990 | HOU | Columbus Mudcats | Sou | AA | team page | 144 | 67 | 77 | 18.0 | 637 | 676 | -39 | 3 | 7 | Rick Sweet | Golden Park | dnq |
| 1990 | HOU | Osceola Astros | FSL | A+ | team page | 138 | 72 | 66 | 14.0 | 603 | 576 | 27 | 2 | 7 | Sal Butera | Osceola County Stadium | dnq |
| 1990 | HOU | Asheville Tourists | SAL | A | team page | 143 | 66 | 77 | 16.0 | 638 | 699 | -61 | 4 | 9 | Frank Cacciatore | McCormick Field | dnq |
| 1990 | HOU | Auburn Astros | NYPL | A- | team page | 77 | 31 | 46 | 20.0 | 345 | 452 | -107 | 4 | 11 | Rick Peters | Falcon Park | dnq |
| 1990 | HOU | Gulf Coast Astros | GCL | Rk | team page | 63 | 33 | 30 | 5.0 | 336 | 275 | 61 | 4 | 7 | | Osecola County Stadium | dnq |
| 1990 | KCA | Kansas City Royals | MLB-AL | MLB | team page | 161 | 75 | 86 | 27.5 | 707 | 709 | -2 | 6 | 11 | John Wathan | Royals Stadium | dnq |
| 1990 | KCA | Omaha Royals | Amer | AAA | team page | 146 | 86 | 60 | -- | 678 | 555 | 123 | 0 | 1 | Sal Rende | Johnny Rosenblatt Stadium | League Champions, AAA Champions |
| 1990 | KCA | Memphis Chicks | Sou | AA | team page | 144 | 73 | 71 | 6.0 | 718 | 625 | 93 | 3 | 5 | Jeff Cox | Tim McCarver Stadium | League Champions |
| 1990 | KCA | Baseball City Royals | FSL | A+ | team page | 138 | 60 | 78 | 26.0 | 552 | 675 | -123 | 3 | 11 | Brian Poldberg | Baseball City Stadium | dnq |
| 1990 | KCA | Appleton Foxes | Midw | A | team page | 133 | 62 | 71 | 14.5 | 564 | 557 | 7 | 3 | 8 | Joseph Breeden | Goodland Field | dnq |
| 1990 | KCA | Eugene Emeralds | Nwst | A- | team page | 76 | 30 | 46 | 23.0 | 303 | 372 | -69 | 3 | 7 | Paul Kirsch | Civic Stadium | dnq |
| 1990 | KCA | Gulf Coast Royals | GCL | Rk | team page | 63 | 25 | 38 | 13.0 | 241 | 291 | -50 | 5 | 12 | Carlos Tosca | Baseball City Stadium | dnq |
| 1990 | LAN | Los Angeles Dodgers | MLB-NL | MLB | team page | 162 | 86 | 76 | 5.0 | 728 | 685 | 43 | 2 | 4 | Tommy Lasorda | Dodger Stadium | dnq |
| 1990 | LAN | Albuquerque Dukes | PCL | AAA | team page | 142 | 91 | 51 | -- | 813 | 658 | 155 | 1 | 1 | Kevin Kennedy | Albuquerque Sports Stadium | League Champions |
| 1990 | LAN | San Antonio Missions | Tex | AA | team page | 134 | 78 | 56 | -- | 668 | 544 | 124 | 1 | 1 | John Shoemaker | V.J. Keefe Memorial Stadium | Lost in Finals |
| 1990 | LAN | Bakersfield Dodgers | Calif | A+ | team page | 142 | 80 | 62 | -- | 730 | 661 | 69 | 0 | 3 | Tom Beyers | Sam Lynn Ballpark | Lost in Finals |
| 1990 | LAN | Vero Beach Dodgers | FSL | A+ | team page | 135 | 79 | 56 | 14.5 | 671 | 532 | 139 | 2 | 5 | Joe Alvarez | Holman Stadium | League Champions |
| 1990 | LAN | Yakima Bears | Nwst | A- | team page | 76 | 36 | 40 | 13.0 | 397 | 403 | -6 | 2 | 4 | Jerry Royster | Parker Field | dnq |
| 1990 | LAN | Great Falls Dodgers | Pio | Rk | team page | 68 | 48 | 20 | -- | 435 | 257 | 178 | 1 | 1 | Joe Vavra | Legion Field | League Champions |
| 1990 | LAN | Gulf Coast Dodgers | GCL | Rk | team page | 63 | 38 | 25 | -- | 312 | 257 | 55 | 1 | 2 | Ivan De Jesus | Holman Stadium | League Champions |
| 1990 | MIL | Milwaukee Brewers | MLB-AL | MLB | team page | 162 | 74 | 88 | 14.0 | 732 | 760 | -28 | 6 | 13 | Tom Trebelhorn | County Stadium | dnq |
| 1990 | MIL | Denver Zephyrs | Amer | AAA | team page | 146 | 68 | 78 | -- | 756 | 820 | -64 | 0 | 6 | Dave Machemer | Mile High Stadium | dnq |
| 1990 | MIL | El Paso Diablos | Tex | AA | team page | 135 | 77 | 58 | 1.5 | 653 | 613 | 40 | 2 | 2 | Dave Huppert | Cohen Stadium | Lost in Semi-Finals |
| 1990 | MIL | Stockton Ports | Calif | A+ | team page | 141 | 82 | 59 | -- | 663 | 611 | 52 | 1 | 2 | Chris Bando | Billy Hebert Field | League Champions |
| 1990 | MIL | Beloit Brewers | Midw | A | team page | 135 | 72 | 63 | 5.5 | 594 | 563 | 31 | 2 | 7 | Rob Derksen | Harry C. Pohlman Field | dnq |
| 1990 | MIL | Arizona Brewers | Ariz | Rk | team page | 53 | 36 | 17 | -- | 334 | 238 | 96 | 1 | 1 | Alex Taveras | Maryvale Baseball Park | dnq |
| 1990 | MIL | Helena Brewers | Pio | Rk | team page | 65 | 37 | 28 | 9.5 | 365 | 325 | 40 | 2 | 3 | | Kindrick Field | dnq |
| 1990 | MIN | Minnesota Twins | MLB-AL | MLB | team page | 162 | 74 | 88 | 29.0 | 666 | 729 | -63 | 7 | 12 | Tom Kelly | Hubert H. Humphrey Metrodome | dnq |
| 1990 | MIN | Portland Beavers | PCL | AAA | team page | 139 | 56 | 83 | 21.0 | 646 | 617 | 29 | 5 | 9 | Phil Roof | Civic Stadium | dnq |
| 1990 | MIN | Orlando Sun Rays | Sou | AA | team page | 144 | 85 | 59 | -- | 685 | 582 | 103 | 1 | 1 | Ron Gardenhire | Tinker Field | Lost in Finals |
| 1990 | MIN | Visalia Oaks | Calif | A+ | team page | 141 | 90 | 51 | -- | 724 | 568 | 156 | 1 | 1 | Scott Ullger | Recreation Park | Lost in Semi-finals |
| 1990 | MIN | Kenosha Twins | Midw | A | team page | 138 | 61 | 77 | 18.0 | 533 | 545 | -12 | 4 | 10 | Steven Liddle | Simmons Field | dnq |
| 1990 | MIN | Elizabethton Twins | App | Rk | team page | 67 | 51 | 16 | -- | 423 | 268 | 155 | 1 | 1 | Ray Smith | Joe O'Brien Field | dnq |
| 1990 | MIN | Gulf Coast Twins | GCL | Rk | team page | 62 | 32 | 30 | 7.5 | 295 | 320 | -25 | 4 | 9 | Joel Lepel | Hammond Stadium | dnq |
| 1990 | MON | Montreal Expos | MLB-NL | MLB | team page | 162 | 85 | 77 | 10.0 | 662 | 598 | 64 | 3 | 6 | Buck Rodgers | Olympic Stadium | dnq |
| 1990 | MON | Indianapolis Indians | Amer | AAA | team page | 146 | 61 | 85 | -- | 567 | 590 | -23 | 0 | 7 | Tim Johnson | Bush Stadium | dnq |
| 1990 | MON | Jacksonville Expos | Sou | AA | team page | 144 | 84 | 60 | 1.0 | 665 | 557 | 108 | 2 | 2 | Jerry Manuel | Sam W. Wolfson Baseball Park | Lost in Semi-Finals |
| 1990 | MON | West Palm Beach Expos | FSL | A+ | team page | 132 | 92 | 40 | -- | 597 | 428 | 169 | 1 | 1 | Felipe Alou | West Palm Beach Municipal Stadium | Lost in Finals |
| 1990 | MON | Rockford Expos | Midw | A | team page | 136 | 56 | 80 | 22.0 | 525 | 614 | -89 | 5 | 12 | Mike Quade | Marinelli Field | dnq |
| 1990 | MON | Jamestown Expos | NYPL | A- | team page | 77 | 41 | 36 | 3.0 | 320 | 319 | 1 | 2 | 7 | Don Werner | College Stadium | Lost in Semi-Finals |
| 1990 | MON | Gulf Coast Expos | GCL | Rk | team page | 63 | 40 | 23 | -- | 319 | 218 | 101 | 1 | 1 | Lorenzo Bundy | McKechnie Field | Lost in Finals |
| 1990 | NYN | New York Mets | MLB-NL | MLB | team page | 162 | 91 | 71 | 4.0 | 775 | 613 | 162 | 2 | 2 | Bud Harrelson, Davey Johnson | Shea Stadium | dnq |
| 1990 | NYN | Tidewater Tides | IL | AAA | team page | 146 | 79 | 67 | 8.0 | 592 | 551 | 41 | 2 | 3 | Steve Swisher | Met Park | dnq |
| 1990 | NYN | Jackson Mets | Tex | AA | team page | 135 | 73 | 62 | -- | 555 | 499 | 56 | 1 | 3 | Clint Hurdle | Smith-Wills Stadium | Lost in Semi-Finals |
| 1990 | NYN | St. Lucie Mets | FSL | A+ | team page | 134 | 76 | 58 | 17.0 | 641 | 509 | 132 | 3 | 6 | Tim Blackwell | Thomas J. White Stadium | Lost in 1st Round |
| 1990 | NYN | Columbia Mets | SAL | A | team page | 143 | 83 | 60 | -- | 732 | 603 | 129 | 1 | 1 | Tim Blackwell | Capital City Stadium | Lost in Semi-Finals |
| 1990 | NYN | Pittsfield Mets | NYPL | A- | team page | 77 | 43 | 34 | 8.5 | 379 | 346 | 33 | 2 | 5 | Jim Eschen | Wahconah Park | dnq |
| 1990 | NYN | Gulf Coast Mets | GCL | Rk | team page | 59 | 29 | 30 | 9.0 | 225 | 226 | -1 | 6 | 10 | | Thomas J. White Stadium | dnq |
| 1990 | NYN | Kingsport Mets | App | Rk | team page | 72 | 41 | 31 | 12.5 | 370 | 307 | 63 | 2 | 3 | Jim Thrift | Dobyns-Bennett | dnq |
| 1990 | NYA | New York Yankees | MLB-AL | MLB | team page | 162 | 67 | 95 | 21.0 | 603 | 749 | -146 | 7 | 14 | Stump Merrill, Bucky Dent | Yankee Stadium I | dnq |
| 1990 | NYA | Columbus Clippers | IL | AAA | team page | 146 | 87 | 59 | -- | 710 | 537 | 173 | 1 | 2 | Stump Merrill | Cooper Stadium | dnq |
| 1990 | NYA | Albany/Colonie Yankees | East | AA | team page | 139 | 79 | 60 | -- | 620 | 533 | 87 | 1 | 1 | Rick Down, Dan Radison | Heritage Park | Lost in Semi-Finals |
| 1990 | NYA | Fort Lauderdale Yankees | FSL | A+ | team page | 137 | 62 | 75 | 32.5 | 537 | 654 | -117 | 4 | 9 | Mike Hart | Fort Lauderdale Stadium | dnq |
| 1990 | NYA | Prince William Cannons | Caro | A+ | team page | 139 | 64 | 75 | 11.5 | 554 | 533 | 21 | 2 | 5 | Gary Denbo | G. Richard Pfitzner Stadium | dnq |
| 1990 | NYA | Greensboro Hornets | SAL | A | team page | 144 | 59 | 85 | 23.5 | 547 | 670 | -123 | 6 | 11 | Brian Butterfield | World War Memorial Stadium | dnq |
| 1990 | NYA | Oneonta Yankees | NYPL | A- | team page | 78 | 52 | 26 | -- | 363 | 266 | 97 | 1 | 1 | Trey Hillman | Damaschke Field | League Champions |
| 1990 | NYA | Gulf Coast Yankees | GCL | Rk | team page | 62 | 32 | 30 | 7.5 | 251 | 221 | 30 | 5 | 8 | Glenn Sherlock | Yankee Complex | dnq |
| 1990 | OAK | Oakland Athletics | MLB-AL | MLB | team page | 162 | 103 | 59 | -- | 733 | 570 | 163 | 1 | 1 | Tony La Russa | Oakland-Alameda County Coliseum | Lost World Series (Reds) |
| 1990 | OAK | Tacoma Tigers | PCL | AAA | team page | 142 | 75 | 67 | 3.5 | 695 | 652 | 43 | 2 | 4 | Bradley Fischer | Cheney Stadium | Lost in Semi-Finals |
| 1990 | OAK | Huntsville Stars | Sou | AA | team page | 144 | 79 | 65 | -- | 678 | 681 | -3 | 1 | 3 | Jeff Newman | Joe W. Davis Stadium | dnq |
| 1990 | OAK | Modesto A's | Calif | A+ | team page | 141 | 59 | 82 | 23.0 | 596 | 678 | -82 | 5 | 9 | Ted Kubiak | John Thurman Field | dnq |
| 1990 | OAK | Madison Muskies | Midw | A | team page | 135 | 74 | 61 | 14.5 | 602 | 567 | 35 | 5 | 6 | Casey Parsons | Warner Park | Lost in Semi-Finals |
| 1990 | OAK | Southern Oregon A's | Nwst | A- | team page | 76 | 40 | 36 | 13.0 | 369 | 325 | 44 | 2 | 3 | Grady Fuson | Miles Field | dnq |
| 1990 | OAK | Arizona Athletics | Ariz | Rk | team page | 53 | 26 | 27 | 10.0 | 292 | 309 | -17 | 4 | 4 | Gary Jones | Scottsdale Stadium | dnq |
| 1990 | PHI | Philadelphia Phillies | MLB-NL | MLB | team page | 162 | 77 | 85 | 18.0 | 646 | 729 | -83 | 4 | 7 | Nick Leyva | Veterans Stadium | dnq |
| 1990 | PHI | Scranton/Wilkes-Barre Red Barons | IL | AAA | team page | 146 | 68 | 78 | 21.5 | 580 | 661 | -81 | 2 | 5 | Bill Dancy | Lackawanna County Stadium | dnq |
| 1990 | PHI | Reading Phillies | East | AA | team page | 137 | 55 | 82 | 23.0 | 474 | 578 | -104 | 8 | 8 | Don McCormack | Reading Municipal Memorial Stadium | dnq |
| 1990 | PHI | Clearwater Phillies | FSL | A+ | team page | 137 | 50 | 87 | 34.5 | 476 | 595 | -119 | 5 | 12 | Lee Elia | Jack Russell Memorial Stadium | dnq |
| 1990 | PHI | Spartanburg Phillies | SAL | A | team page | 141 | 63 | 78 | 18.0 | 530 | 573 | -43 | 5 | 10 | Mel Roberts | Duncan Park | dnq |
| 1990 | PHI | Batavia Clippers | NYPL | A- | team page | 76 | 41 | 35 | 9.5 | 369 | 328 | 41 | 2 | 6 | Ramon Aviles, Dave Cash, Tony Scott | Dwyer Stadium | dnq |
| 1990 | PHI | Martinsville Phillies | App | Rk | team page | 69 | 25 | 44 | 27.0 | 280 | 341 | -61 | 9 | 9 | Roly De Armas | Hooker Field | dnq |
| 1990 | PIT | Pittsburgh Pirates | MLB-NL | MLB | team page | 162 | 95 | 67 | -- | 733 | 619 | 114 | 1 | 1 | Jim Leyland | Three Rivers Stadium | Lost NLCS (Reds) |
| 1990 | PIT | Buffalo Bisons | Amer | AAA | team page | 147 | 85 | 62 | -- | 627 | 547 | 80 | 0 | 3 | Terry Collins | Pilot Field | dnq |
| 1990 | PIT | Harrisburg Senators | East | AA | team page | 138 | 69 | 69 | 9.5 | 531 | 475 | 56 | 5 | 5 | Marc Bombard | Riverside Stadium | dnq |
| 1990 | PIT | Salem Buccaneers | Caro | A+ | team page | 139 | 55 | 84 | 20.5 | 633 | 801 | -168 | 4 | 8 | Stan Cliburn | Salem Municipal Stadium | dnq |
| 1990 | PIT | Augusta Pirates | SAL | A | team page | 143 | 73 | 70 | 10.0 | 681 | 663 | 18 | 3 | 8 | Lee Driggers | Heaton Stadium | dnq |
| 1990 | PIT | Welland Pirates | NYPL | A- | team page | 78 | 36 | 42 | 8.5 | 366 | 375 | -9 | 3 | 8 | Jack Lind | Welland Stadium | dnq |
| 1990 | PIT | Gulf Coast Pirates | GCL | Rk | team page | 62 | 25 | 37 | 14.5 | 230 | 280 | -50 | 7 | 11 | | Pirate City Stadium | dnq |
| 1990 | SDN | San Diego Padres | MLB-NL | MLB | team page | 162 | 75 | 87 | 16.0 | 673 | 673 | 0 | 4 | 9 | Greg Riddoch, Jack McKeon | Jack Murphy Stadium | dnq |
| 1990 | SDN | Las Vegas Stars | PCL | AAA | team page | 144 | 58 | 86 | 34.0 | 688 | 913 | -225 | 5 | 10 | Pat Kelly | Cashman Field | dnq |
| 1990 | SDN | Wichita Wranglers | Tex | AA | team page | 135 | 67 | 68 | 11.5 | 683 | 663 | 20 | 3 | 5 | Steve Lubratich | Lawrence-Dumont Stadium | dnq |
| 1990 | SDN | Riverside Red Wave | Calif | A+ | team page | 142 | 64 | 78 | 26.5 | 608 | 709 | -101 | 4 | 7 | Bruce Bochy | Riverside Sports Complex | dnq |
| 1990 | SDN | Charleston (sc) Rainbows | SAL | A | team page | 142 | 46 | 96 | 36.5 | 472 | 762 | -290 | 6 | 12 | Jack Krol | College Park | dnq |
| 1990 | SDN | Waterloo Diamonds | Midw | A | team page | 136 | 60 | 76 | 29.0 | 533 | 559 | -26 | 7 | 11 | Bryan Little | Municipal Stadium | dnq |
| 1990 | SDN | Spokane Indians | Nwst | A- | team page | 76 | 49 | 27 | -- | 394 | 360 | 34 | 1 | 2 | Gene Glynn | Avista Stadium | League Champions |
| 1990 | SDN | Arizona Padres | Ariz | Rk | team page | 54 | 19 | 35 | 17.5 | 261 | 379 | -118 | 5 | 5 | Jaime Moreno | Scottsdale Stadium | dnq |
| 1990 | SFN | San Francisco Giants | MLB-NL | MLB | team page | 162 | 85 | 77 | 6.0 | 719 | 710 | 9 | 3 | 5 | Roger Craig | Candlestick Park | dnq |
| 1990 | SFN | Phoenix Firebirds | PCL | AAA | team page | 139 | 63 | 76 | 26.5 | 689 | 707 | -18 | 4 | 8 | Duane Espy | Phoenix Municipal Stadium | dnq |
| 1990 | SFN | Shreveport Captains | Tex | AA | team page | 133 | 65 | 68 | 7.0 | 538 | 496 | 42 | 3 | 6 | Billy Evers | Fair Grounds Field | League Champions |
| 1990 | SFN | San Jose Giants | Calif | A+ | team page | 142 | 74 | 68 | 8.5 | 766 | 688 | 78 | 2 | 5 | Tom Spencer | San Jose Municipal Stadium | Lost in Semi-finals |
| 1990 | SFN | Clinton Giants | Midw | A | team page | 134 | 76 | 58 | 12.0 | 563 | 458 | 105 | 4 | 5 | Jack Mull | Riverview Stadium | dnq |
| 1990 | SFN | Everett Giants | Nwst | A- | team page | 76 | 35 | 41 | 14.0 | 354 | 370 | -16 | 3 | 5 | Deron McCue | Everett Memorial Stadium | dnq |
| 1990 | SEA | Seattle Mariners | MLB-AL | MLB | team page | 162 | 77 | 85 | 26.0 | 640 | 680 | -40 | 5 | 8 | Jim Lefebvre | The Kingdome | dnq |
| 1990 | SEA | Calgary Cannons | PCL | AAA | team page | 143 | 66 | 77 | 13.0 | 738 | 827 | -89 | 4 | 7 | Thomas Jones | Foothills Stadium | dnq |
| 1990 | SEA | Williamsport Bills | East | AA | team page | 140 | 61 | 79 | 18.5 | 467 | 577 | -110 | 7 | 7 | Rich Morales | Bowman Field | dnq |
| 1990 | SEA | Peninsula Pilots | Caro | A+ | team page | 140 | 57 | 83 | 33.5 | 506 | 631 | -125 | 4 | 7 | Jim Nettles | War Memorial Stadium | dnq |
| 1990 | SEA | San Bernardino Spirit | Calif | A+ | team page | 142 | 77 | 65 | 13.5 | 842 | 746 | 96 | 3 | 4 | Keith Bodie | Perris Hill Park | dnq |
| 1990 | SEA | Bellingham Mariners | Nwst | A- | team page | 76 | 32 | 44 | 17.0 | 273 | 342 | -69 | 4 | 6 | P.J. Carey | Joe Martin Field | dnq |
| 1990 | SEA | Arizona Mariners | Ariz | Rk | team page | 53 | 32 | 21 | 4.0 | 354 | 280 | 74 | 2 | 2 | Dave Myers | Peoria Sports Complex | dnq |
| 1990 | SLN | St. Louis Cardinals | MLB-NL | MLB | team page | 162 | 70 | 92 | 25.0 | 599 | 698 | -99 | 6 | 11 | Whitey Herzog, Joe Torre, Red Schoendienst | Busch Stadium II | dnq |
| 1990 | SLN | Louisville Redbirds | Amer | AAA | team page | 146 | 74 | 72 | -- | 564 | 591 | -27 | 0 | 4 | Gaylen Pitts | Cardinal Stadium | dnq |
| 1990 | SLN | Arkansas Travelers | Tex | AA | team page | 136 | 56 | 80 | 17.5 | 503 | 650 | -147 | 4 | 8 | Dave Bialas | Ray Winder Field | dnq |
| 1990 | SLN | St. Petersburg Cardinals | FSL | A+ | team page | 134 | 60 | 74 | 23.0 | 515 | 527 | -12 | 4 | 10 | Joe Pettini | Al Lang Field | dnq |
| 1990 | SLN | Savannah Cardinals | SAL | A | team page | 141 | 73 | 68 | 9.0 | 552 | 619 | -67 | 5 | 6 | Keith Champion | Grayson Stadium | Lost in Finals |
| 1990 | SLN | Springfield Cardinals | Midw | A | team page | 139 | 63 | 76 | 27.5 | 548 | 668 | -120 | 6 | 9 | Keith Champion | Lanphier Park | dnq |
| 1990 | SLN | Hamilton Redbirds | NYPL | A- | team page | 76 | 30 | 46 | 13.5 | 287 | 330 | -43 | 5 | 13 | Luis Melendez | Bernie Arbour Memorial Stadium | dnq |
| 1990 | SLN | Arizona Cardinals | Ariz | Rk | team page | 52 | 28 | 24 | 7.5 | 312 | 277 | 35 | 3 | 3 | Larry Milbourne | Compadre Stadium | dnq |
| 1990 | SLN | Johnson City Cardinals | App | Rk | team page | 70 | 28 | 42 | 24.5 | 301 | 371 | -70 | 8 | 8 | Mark DeJohn | Howard Johnson Field | dnq |
| 1990 | TEX | Texas Rangers | MLB-AL | MLB | team page | 162 | 83 | 79 | 20.0 | 676 | 696 | -20 | 3 | 5 | Bobby Valentine | Arlington Stadium | dnq |
| 1990 | TEX | Oklahoma City 89ers | Amer | AAA | team page | 145 | 58 | 87 | -- | 609 | 753 | -144 | 0 | 8 | Steve Smith | All Sports Stadium | dnq |
| 1990 | TEX | Tulsa Drillers | Tex | AA | team page | 136 | 68 | 68 | 5.5 | 624 | 620 | 4 | 2 | 4 | Tommy Thompson | Drillers Stadium | dnq |
| 1990 | TEX | Charlotte Rangers | FSL | A+ | team page | 138 | 85 | 53 | -- | 581 | 380 | 201 | 1 | 4 | Bob Jones | Charlotte County Stadium | Lost in Semi-Finals |
| 1990 | TEX | Gastonia Rangers | SAL | A | team page | 143 | 82 | 61 | -- | 627 | 511 | 116 | 2 | 2 | | Sims Legion Park | dnq |
| 1990 | TEX | Butte Copper Kings | Pio | Rk | team page | 67 | 37 | 30 | 4.5 | 436 | 384 | 52 | 3 | 5 | | Cobb Field | dnq |
| 1990 | TEX | Gulf Coast Rangers | GCL | Rk | team page | 63 | 36 | 27 | 4.0 | 263 | 229 | 34 | 2 | 4 | Chino Cadahia | Charlotte County Stadium | dnq |
| 1990 | TOR | Toronto Blue Jays | MLB-AL | MLB | team page | 162 | 86 | 76 | 2.0 | 767 | 661 | 106 | 2 | 4 | Cito Gaston | SkyDome | dnq |
| 1990 | TOR | Syracuse Chiefs | IL | AAA | team page | 145 | 62 | 83 | 27.0 | 569 | 622 | -53 | 4 | 6 | Bob Bailor | MacArthur Stadium | dnq |
| 1990 | TOR | Knoxville Blue Jays | Sou | AA | team page | 144 | 67 | 77 | 12.0 | 615 | 673 | -58 | 4 | 6 | John Stearns | Bill Meyer Stadium | dnq |
| 1990 | TOR | Dunedin Blue Jays | FSL | A+ | team page | 136 | 84 | 52 | 1.0 | 639 | 511 | 128 | 2 | 3 | Dennis Holmberg | Dunedin Stadium | Lost in 1st Round |
| 1990 | TOR | Myrtle Beach Blue Jays | SAL | A | team page | 140 | 77 | 63 | 4.5 | 610 | 548 | 62 | 2 | 4 | | Watson Stadium | dnq |
| 1990 | TOR | St. Catharines Blue Jays | NYPL | A- | team page | 76 | 29 | 47 | 14.5 | 254 | 317 | -63 | 6 | 14 | Doug Ault | Community Park | dnq |
| 1990 | TOR | Medicine Hat Blue Jays | Pio | Rk | team page | 66 | 20 | 46 | 27.0 | 264 | 427 | -163 | 4 | 7 | Garth Iorg | Athletic Park | dnq |