| 1990-04-09 | @ LAN | 1 | L 2-4 | 0-1 | 5 | 48,686 | Bruce Hurst | Orel Hershiser | John Wetteland | Bruce Hurst | Don Aase | 2 | 4 | -2 |
| 1990-04-10 | vs LAN | 2 | L 0-1 | 0-2 | 5 | 54,098 | Eric Show | Tim Belcher | Tim Belcher | Eric Show | | 2 | 5 | -3 |
| 1990-04-11 | vs LAN | 3 | W 3-1 | 1-2 | 5 | 29,872 | Andy Benes | Fernando Valenzuela | Andy Benes | Fernando Valenzuela | Craig Lefferts | 5 | 6 | -1 |
| 1990-04-12 | vs LAN | 4 | W 8-6 | 2-2 | 4 | 37,204 | Dennis Rasmussen | Ramon Martinez | Calvin Schiraldi | Don Aase | Craig Lefferts | 13 | 12 | 1 |
| 1990-04-13 | @ SFN | 5 | W 8-3 | 3-2 | 3 | 52,872 | Ed Whitson | Scott Garrelts | Greg Harris | Dan Quisenberry | | 21 | 15 | 6 |
| 1990-04-14 | @ SFN | 6 | W 5-3 | 4-2 | 2 | 24,846 | Bruce Hurst | Eric Gunderson | Craig Lefferts | Jeff Brantley | | 26 | 18 | 8 |
| 1990-04-15 | @ SFN | 7 | W 4-3 | 5-2 | 2 | 29,339 | Eric Show | Rick Reuschel | Greg Harris | Steve Bedrosian | | 30 | 21 | 9 |
| 1990-04-17 | @ CIN | 8 | L 1-2 | 5-3 | 2 | 45,000 | Andy Benes | Tom Browning | Tom Browning | Andy Benes | Randy Myers | 31 | 23 | 8 |
| 1990-04-18 | @ CIN | 9 | L 7-11 | 5-4 | 3 | 18,487 | Dennis Rasmussen | Danny Jackson | Tim Layana | Rafael Valdez | Rob Dibble | 38 | 34 | 4 |
| 1990-04-20 | vs SFN | 10 | W 9-2 | 6-4 | 2 | 36,052 | Ed Whitson | Rick Reuschel | Ed Whitson | Rick Reuschel | | 47 | 36 | 11 |
| 1990-04-21 | vs SFN | 11 | L 4-6 | 6-5 | 2 | 56,147 | Bruce Hurst | Mike LaCoss | Mike LaCoss | Bruce Hurst | Steve Bedrosian | 51 | 42 | 9 |
| 1990-04-22 | vs SFN | 12 | L 1-3 | 6-6 | 3 | 28,555 | Eric Show | Atlee Hammaker | Atlee Hammaker | Eric Show | Steve Bedrosian | 52 | 45 | 7 |
| 1990-04-23 | vs SFN | 13 | W 13-3 | 7-6 | 3 | 11,312 | Andy Benes | Eric Gunderson | Andy Benes | Eric Gunderson | Calvin Schiraldi | 65 | 48 | 17 |
| 1990-04-24 | vs CHN | 14 | W 13-3 | 8-6 | 3 | 19,474 | Dennis Rasmussen | Greg Maddux | Dennis Rasmussen | Greg Maddux | | 78 | 51 | 27 |
| 1990-04-25 | vs CHN | 15 | W 3-0 | 9-6 | 2 | 22,305 | Ed Whitson | Mike Bielecki | Ed Whitson | Mike Bielecki | | 81 | 51 | 30 |
| 1990-04-26 | vs CHN | 16 | L 1-3 | 9-7 | 2 | 29,168 | Bruce Hurst | Mike Harkey | Mike Harkey | Bruce Hurst | Mitch Williams | 82 | 54 | 28 |
| 1990-04-27 | vs PIT | 17 | L 4-9 | 9-8 | 3 | 23,376 | Eric Show | Neal Heaton | Neal Heaton | Eric Show | | 86 | 63 | 23 |
| 1990-04-28 | vs PIT | 18 | L 3-4 | 9-9 | 3 | 26,473 | Andy Benes | Bob Walk | Bob Walk | Andy Benes | Bill Landrum | 89 | 67 | 22 |
| 1990-04-29 | vs PIT | 19 | L 1-10 | 9-10 | 3 | 27,206 | Dennis Rasmussen | Doug Drabek | Doug Drabek | Dennis Rasmussen | | 90 | 77 | 13 |
| 1990-05-01 | vs SLN | 20 | L 1-2 | 9-11 | 4 | 18,562 | Ed Whitson | Bryn Smith | Bryn Smith | Ed Whitson | Scott Terry | 91 | 79 | 12 |
| 1990-05-02 | vs SLN | 21 | W 4-3 | 10-11 | 3 | 18,697 | Bruce Hurst | Jose DeLeon | Bruce Hurst | Jose DeLeon | Craig Lefferts | 95 | 82 | 13 |
| 1990-05-05 | @ CHN | 22 | L 2-3 | 11-12 | 4 | 0 | Andy Benes | Greg Maddux | Greg Maddux | Craig Lefferts | | 97 | 85 | 12 |
| 1990-05-05 | @ CHN | 23 | W 6-5 | 11-12 | 4 | 33,695 | Dennis Rasmussen | Jose Nunez | Dennis Rasmussen | Jose Nunez | Greg Harris | 103 | 90 | 13 |
| 1990-05-06 | @ CHN | 24 | W 8-3 | 12-12 | 3 | 34,077 | Ed Whitson | Mike Bielecki | Ed Whitson | Mike Bielecki | | 111 | 93 | 18 |
| 1990-05-07 | @ PIT | 25 | L 1-4 | 12-13 | 3 | 9,653 | Bruce Hurst | Bob Walk | Bob Walk | Bruce Hurst | Ted Power | 112 | 97 | 15 |
| 1990-05-08 | @ PIT | 26 | L 2-10 | 12-14 | 3 | 10,694 | Eric Show | Walt Terrell | Walt Terrell | Eric Show | | 114 | 107 | 7 |
| 1990-05-09 | @ SLN | 27 | L 5-11 | 12-15 | 3 | 19,717 | Andy Benes | John Tudor | Ricky Horton | Andy Benes | | 119 | 118 | 1 |
| 1990-05-10 | @ SLN | 28 | W 9-1 | 13-15 | 3 | 28,597 | Dennis Rasmussen | Joe Magrane | Dennis Rasmussen | Joe Magrane | | 128 | 119 | 9 |
| 1990-05-11 | vs MON | 29 | W 5-3 | 14-15 | 2 | 31,080 | Ed Whitson | Mark Gardner | Craig Lefferts | Drew Hall | | 133 | 122 | 11 |
| 1990-05-12 | vs MON | 30 | W 5-2 | 15-15 | 2 | 24,493 | Bruce Hurst | Zane Smith | Bruce Hurst | Zane Smith | | 138 | 124 | 14 |
| 1990-05-13 | vs MON | 31 | L 0-15 | 15-16 | 2 | 16,197 | Eric Show | Oil Can Boyd | Oil Can Boyd | Eric Show | | 138 | 139 | -1 |
| 1990-05-14 | vs PHI | 32 | W 5-1 | 16-16 | 2 | 16,389 | Andy Benes | Pat Combs | Andy Benes | Pat Combs | | 143 | 140 | 3 |
| 1990-05-15 | vs PHI | 33 | L 1-2 | 16-17 | 3 | 22,596 | Dennis Rasmussen | Terry Mulholland | Terry Mulholland | Dennis Rasmussen | Roger McDowell | 144 | 142 | 2 |
| 1990-05-16 | vs PHI | 34 | L 5-6 | 16-18 | 3 | 17,710 | Ed Whitson | Ken Howell | Ken Howell | Ed Whitson | Roger McDowell | 149 | 148 | 1 |
| 1990-05-18 | vs NYN | 35 | W 6-3 | 17-18 | 3 | 26,905 | Bruce Hurst | Frank Viola | Bruce Hurst | Frank Viola | Craig Lefferts | 155 | 151 | 4 |
| 1990-05-19 | vs NYN | 36 | L 4-6 | 17-19 | 3 | 36,577 | Andy Benes | David Cone | David Cone | Andy Benes | John Franco | 159 | 157 | 2 |
| 1990-05-20 | vs NYN | 37 | W 3-1 | 18-19 | 3 | 25,233 | Dennis Rasmussen | Sid Fernandez | Greg Harris | Ron Darling | Craig Lefferts | 162 | 158 | 4 |
| 1990-05-22 | @ MON | 38 | L 1-6 | 18-20 | 3 | 11,690 | Ed Whitson | Mark Gardner | Mark Gardner | Ed Whitson | | 163 | 164 | -1 |
| 1990-05-23 | @ MON | 39 | L 0-4 | 18-21 | 3 | 12,469 | Bruce Hurst | Oil Can Boyd | Oil Can Boyd | Bruce Hurst | | 163 | 168 | -5 |
| 1990-05-24 | @ NYN | 40 | W 5-4 | 19-21 | 3 | 31,659 | Andy Benes | Frank Viola | Andy Benes | Frank Viola | Craig Lefferts | 168 | 172 | -4 |
| 1990-05-25 | @ NYN | 41 | W 5-4 | 20-21 | 3 | 31,098 | Dennis Rasmussen | David Cone | Dennis Rasmussen | David Cone | Craig Lefferts | 173 | 176 | -3 |
| 1990-05-26 | @ NYN | 42 | L 0-11 | 20-22 | 3 | 26,498 | Mike Dunne | Sid Fernandez | Sid Fernandez | Mike Dunne | | 173 | 187 | -14 |
| 1990-05-27 | @ NYN | 43 | W 8-4 | 21-22 | 3 | 47,876 | Ed Whitson | Dwight Gooden | Ed Whitson | Dwight Gooden | Craig Lefferts | 181 | 191 | -10 |
| 1990-05-28 | @ PHI | 44 | W 9-5 | 22-22 | 3 | 18,390 | Bruce Hurst | Ken Howell | Mark Grant | Jeff Parrett | | 190 | 196 | -6 |
| 1990-05-30 | @ PHI | 45 | W 8-3 | 23-22 | 2 | 21,375 | Andy Benes | Bruce Ruffin | Andy Benes | Bruce Ruffin | Greg Harris | 198 | 199 | -1 |
| 1990-05-31 | vs ATL | 46 | W 2-1 | 24-22 | 2 | 13,644 | Dennis Rasmussen | Pete Smith | Dennis Rasmussen | Pete Smith | Greg Harris | 200 | 200 | 0 |
| 1990-06-01 | vs ATL | 47 | L 11-16 | 24-23 | 2 | 22,291 | Mike Dunne | John Smoltz | Tony Castillo | Mike Dunne | | 211 | 216 | -5 |
| 1990-06-02 | vs ATL | 48 | W 9-0 | 25-23 | 2 | 53,701 | Ed Whitson | Derek Lilliquist | Ed Whitson | Derek Lilliquist | | 220 | 216 | 4 |
| 1990-06-03 | vs ATL | 49 | L 2-4 | 25-24 | 2 | 17,151 | Bruce Hurst | Charlie Leibrandt | Charlie Kerfeld | Greg Harris | Joe Boever | 222 | 220 | 2 |
| 1990-06-04 | vs HOU | 50 | W 10-2 | 26-24 | 2 | 16,468 | Andy Benes | Jim Clancy | Andy Benes | Jim Clancy | Craig Lefferts | 232 | 222 | 10 |
| 1990-06-05 | vs HOU | 51 | W 11-2 | 27-24 | 2 | 16,941 | Dennis Rasmussen | Jim Deshaies | Dennis Rasmussen | Jim Deshaies | | 243 | 224 | 19 |
| 1990-06-06 | vs HOU | 52 | W 3-2 | 28-24 | 2 | 15,665 | Mike Dunne | Mark Portugal | Craig Lefferts | Mark Portugal | | 246 | 226 | 20 |
| 1990-06-08 | vs LAN | 53 | W 12-6 | 29-24 | 2 | 34,641 | Ed Whitson | Tim Belcher | Craig Lefferts | Jim Gott | | 258 | 232 | 26 |
| 1990-06-09 | vs LAN | 54 | L 4-5 | 29-25 | 2 | 44,727 | Bruce Hurst | Fernando Valenzuela | John Wetteland | Eric Show | | 262 | 237 | 25 |
| 1990-06-10 | vs LAN | 55 | W 2-1 | 30-25 | 2 | 25,509 | Andy Benes | Ramon Martinez | Greg Harris | Jay Howell | | 264 | 238 | 26 |
| 1990-06-12 | vs SFN | 56 | L 2-7 | 30-26 | 2 | 29,053 | Dennis Rasmussen | Don Robinson | Don Robinson | Dennis Rasmussen | Mark Thurmond | 266 | 245 | 21 |
| 1990-06-13 | vs SFN | 57 | L 0-6 | 30-27 | 2 | 31,455 | Ed Whitson | Trevor Wilson | Trevor Wilson | Ed Whitson | | 266 | 251 | 15 |
| 1990-06-14 | vs SFN | 58 | L 2-6 | 30-28 | 2 | 30,279 | Bruce Hurst | Francisco Oliveras | Ed Vosberg | Bruce Hurst | | 268 | 257 | 11 |
| 1990-06-15 | @ LAN | 59 | W 3-1 | 31-28 | 2 | 39,620 | Andy Benes | Fernando Valenzuela | Calvin Schiraldi | Mike Hartley | | 271 | 258 | 13 |
| 1990-06-16 | @ LAN | 60 | L 2-5 | 31-29 | 3 | 36,819 | Mike Dunne | Ramon Martinez | Ramon Martinez | Mike Dunne | | 273 | 263 | 10 |
| 1990-06-17 | @ LAN | 61 | L 3-6 | 31-30 | 3 | 40,558 | Dennis Rasmussen | Mike Morgan | Mike Morgan | Dennis Rasmussen | Jay Howell | 276 | 269 | 7 |
| 1990-06-18 | @ SFN | 62 | L 1-2 | 31-31 | 3 | 26,388 | Ed Whitson | Trevor Wilson | Trevor Wilson | Ed Whitson | Jeff Brantley | 277 | 271 | 6 |
| 1990-06-19 | @ SFN | 63 | W 4-3 | 32-31 | 3 | 31,164 | Bruce Hurst | Francisco Oliveras | Bruce Hurst | Francisco Oliveras | Craig Lefferts | 281 | 274 | 7 |
| 1990-06-20 | @ SFN | 64 | W 4-3 | 33-31 | 3 | 43,876 | Andy Benes | John Burkett | Craig Lefferts | Steve Bedrosian | Greg Harris | 285 | 277 | 8 |
| 1990-06-23 | @ ATL | 65 | W 7-5 | 34-31 | 2 | 23,724 | Ed Whitson | Tom Glavine | Ed Whitson | Tom Glavine | Craig Lefferts | 292 | 282 | 10 |
| 1990-06-24 | @ ATL | 66 | L 10-11 | 34-32 | 2 | 16,298 | Bruce Hurst | Pete Smith | Rick Luecken | Craig Lefferts | | 302 | 293 | 9 |
| 1990-06-25 | @ HOU | 67 | L 3-5 | 34-33 | 2 | 11,674 | Andy Benes | Mike Scott | Mike Scott | Andy Benes | Dave Smith | 305 | 298 | 7 |
| 1990-06-26 | @ HOU | 68 | W 7-0 | 35-33 | 2 | 12,771 | Dennis Rasmussen | Jim Clancy | Dennis Rasmussen | Jim Clancy | | 312 | 298 | 14 |
| 1990-06-27 | @ HOU | 69 | L 1-9 | 35-34 | 2 | 14,708 | Bruce Hurst | Jim Deshaies | Jim Deshaies | Bruce Hurst | | 313 | 307 | 6 |
| 1990-06-28 | @ HOU | 70 | L 1-2 | 35-35 | 3 | 17,603 | Ed Whitson | Mark Portugal | Larry Andersen | Mark Grant | | 314 | 309 | 5 |
| 1990-06-29 | vs CHN | 71 | L 2-3 | 35-36 | 4 | 43,005 | Mike Dunne | Mike Harkey | Bill Long | Greg Harris | Paul Assenmacher | 316 | 312 | 4 |
| 1990-06-30 | vs CHN | 72 | L 3-7 | 35-37 | 4 | 31,852 | Andy Benes | Shawn Boskie | Steve Wilson | Andy Benes | | 319 | 319 | 0 |
| 1990-07-01 | vs CHN | 73 | L 10-11 | 35-38 | 4 | 30,968 | Dennis Rasmussen | Greg Maddux | Les Lancaster | Craig Lefferts | Bill Long | 329 | 330 | -1 |
| 1990-07-02 | vs PIT | 74 | L 3-4 | 35-39 | 4 | 13,842 | Bruce Hurst | Walt Terrell | Bob Patterson | Calvin Schiraldi | | 332 | 334 | -2 |
| 1990-07-03 | vs PIT | 75 | L 3-5 | 35-40 | 4 | 33,949 | Ed Whitson | Doug Drabek | Bill Landrum | Craig Lefferts | | 335 | 339 | -4 |
| 1990-07-04 | vs PIT | 76 | W 5-4 | 36-40 | 4 | 10,897 | Mike Dunne | Neal Heaton | Eric Show | Neal Heaton | Greg Harris | 340 | 343 | -3 |
| 1990-07-05 | vs SLN | 77 | L 1-4 | 36-41 | 4 | 15,502 | Andy Benes | Bryn Smith | Lee Smith | Greg Harris | | 341 | 347 | -6 |
| 1990-07-06 | vs SLN | 78 | L 3-5 | 36-42 | 4 | 16,992 | Dennis Rasmussen | John Tudor | John Tudor | Dennis Rasmussen | Lee Smith | 344 | 352 | -8 |
| 1990-07-07 | vs SLN | 79 | W 3-1 | 37-42 | 4 | 51,124 | Bruce Hurst | Joe Magrane | Bruce Hurst | Joe Magrane | | 347 | 353 | -6 |
| 1990-07-08 | vs SLN | 80 | L 1-4 | 37-43 | 4 | 17,174 | Ed Whitson | Bob Tewksbury | Bob Tewksbury | Ed Whitson | | 348 | 357 | -9 |
| 1990-07-12 | @ PIT | 81 | L 3-4 | 37-44 | 4 | 10,960 | Andy Benes | John Smiley | Bob Patterson | Calvin Schiraldi | | 351 | 361 | -10 |
| 1990-07-13 | @ PIT | 82 | L 1-4 | 37-45 | 4 | 16,108 | Dennis Rasmussen | Doug Drabek | Doug Drabek | Dennis Rasmussen | Stan Belinda | 352 | 365 | -13 |
| 1990-07-14 | @ PIT | 83 | L 4-8 | 37-46 | 4 | 27,955 | Bruce Hurst | Bob Walk | Ted Power | Greg Harris | | 356 | 373 | -17 |
| 1990-07-15 | @ PIT | 84 | W 4-1 | 38-46 | 4 | 34,386 | Ed Whitson | Neal Heaton | Ed Whitson | Neal Heaton | Craig Lefferts | 360 | 374 | -14 |
| 1990-07-16 | @ CHN | 85 | L 3-4 | 38-47 | 4 | 31,523 | Eric Show | Mike Harkey | Mike Harkey | Eric Show | Mitch Williams | 363 | 378 | -15 |
| 1990-07-17 | @ CHN | 86 | L 2-7 | 38-48 | 4 | 32,923 | Andy Benes | Shawn Boskie | Shawn Boskie | Andy Benes | | 365 | 385 | -20 |
| 1990-07-18 | @ CHN | 87 | L 2-4 | 38-49 | 4 | 33,856 | Dennis Rasmussen | Greg Maddux | Greg Maddux | Dennis Rasmussen | Jeff Pico | 367 | 389 | -22 |
| 1990-07-19 | @ SLN | 88 | L 3-8 | 38-50 | 4 | 29,688 | Bruce Hurst | Joe Magrane | Joe Magrane | Bruce Hurst | Frank DiPino | 370 | 397 | -27 |
| 1990-07-20 | @ SLN | 89 | L 2-4 | 38-51 | 4 | 28,298 | Ed Whitson | John Tudor | John Tudor | Ed Whitson | Lee Smith | 372 | 401 | -29 |
| 1990-07-21 | @ SLN | 90 | L 2-4 | 38-52 | 4 | 38,535 | Eric Show | Bob Tewksbury | Bob Tewksbury | Eric Show | Frank DiPino | 374 | 405 | -31 |
| 1990-07-22 | @ SLN | 91 | L 4-6 | 38-53 | 5 | 31,261 | Derek Lilliquist | Bryn Smith | Ken Dayley | Greg Harris | Lee Smith | 378 | 411 | -33 |
| 1990-07-23 | vs CIN | 92 | L 2-9 | 38-54 | 5 | 18,238 | Dennis Rasmussen | Tom Browning | Tom Browning | Dennis Rasmussen | | 380 | 420 | -40 |
| 1990-07-24 | vs CIN | 93 | W 10-0 | 39-54 | 4 | 24,139 | Bruce Hurst | Jack Armstrong | Bruce Hurst | Jack Armstrong | | 390 | 420 | -30 |
| 1990-07-25 | vs CIN | 94 | W 2-1 | 41-54 | 4 | 0 | Ed Whitson | Norm Charlton | Ed Whitson | Norm Charlton | Craig Lefferts | 392 | 421 | -29 |
| 1990-07-25 | vs CIN | 95 | W 10-4 | 41-54 | 4 | 27,285 | Calvin Schiraldi | Rick Mahler | Calvin Schiraldi | Rick Mahler | | 402 | 425 | -23 |
| 1990-07-26 | vs HOU | 96 | W 8-2 | 42-54 | 4 | 13,538 | Eric Show | Mark Portugal | Eric Show | Mark Portugal | | 410 | 427 | -17 |
| 1990-07-27 | vs HOU | 97 | W 6-2 | 43-54 | 4 | 20,244 | Andy Benes | Bill Gullickson | Andy Benes | Bill Gullickson | | 416 | 429 | -13 |
| 1990-07-28 | vs HOU | 98 | L 3-5 | 43-55 | 4 | 22,621 | Dennis Rasmussen | Mike Scott | Mike Scott | Dennis Rasmussen | Larry Andersen | 419 | 434 | -15 |
| 1990-07-29 | vs HOU | 99 | W 4-3 | 44-55 | 4 | 19,506 | Bruce Hurst | Jim Deshaies | Greg Harris | Dave Smith | Craig Lefferts | 423 | 437 | -14 |
| 1990-07-30 | vs ATL | 100 | L 3-4 | 44-56 | 4 | 18,076 | Ed Whitson | Steve Avery | Dwayne Henry | Calvin Schiraldi | Tony Castillo | 426 | 441 | -15 |
| 1990-07-31 | vs ATL | 101 | W 7-6 | 45-56 | 4 | 12,310 | Eric Show | Marty Clary | Craig Lefferts | Rick Luecken | | 433 | 447 | -14 |
| 1990-08-01 | vs CIN | 102 | L 3-6 | 45-57 | 4 | 11,317 | Andy Benes | Scott Scudder | Scott Scudder | Andy Benes | | 436 | 453 | -17 |
| 1990-08-02 | @ CIN | 103 | W 8-5 | 46-57 | 4 | 35,337 | Dennis Rasmussen | Tom Browning | Dennis Rasmussen | Tom Browning | | 444 | 458 | -14 |
| 1990-08-03 | @ CIN | 104 | W 3-2 | 47-57 | 4 | 34,733 | Bruce Hurst | Jack Armstrong | Greg Harris | Rob Dibble | Craig Lefferts | 447 | 460 | -13 |
| 1990-08-04 | @ CIN | 105 | W 7-3 | 48-57 | 4 | 37,410 | Ed Whitson | Norm Charlton | Greg Harris | Rick Mahler | | 454 | 463 | -9 |
| 1990-08-05 | @ CIN | 106 | L 2-6 | 48-58 | 4 | 38,789 | Calvin Schiraldi | Jose Rijo | Jose Rijo | Calvin Schiraldi | | 456 | 469 | -13 |
| 1990-08-07 | @ ATL | 107 | W 7-2 | 50-58 | 4 | 0 | Andy Benes | Tom Glavine | Andy Benes | Tom Glavine | Greg Harris | 463 | 471 | -8 |
| 1990-08-07 | @ ATL | 108 | W 11-9 | 50-58 | 4 | 10,991 | Eric Show | Marty Clary | Eric Show | Marty Clary | Craig Lefferts | 474 | 480 | -6 |
| 1990-08-08 | @ ATL | 109 | L 1-7 | 50-59 | 4 | 6,070 | Dennis Rasmussen | John Smoltz | John Smoltz | Dennis Rasmussen | | 475 | 487 | -12 |
| 1990-08-09 | @ ATL | 110 | W 7-0 | 51-59 | 4 | 8,312 | Bruce Hurst | Charlie Leibrandt | Bruce Hurst | Charlie Leibrandt | | 482 | 487 | -5 |
| 1990-08-10 | @ HOU | 111 | W 2-0 | 52-59 | 4 | 16,576 | Ed Whitson | Jim Deshaies | Ed Whitson | Jim Deshaies | Craig Lefferts | 484 | 487 | -3 |
| 1990-08-11 | @ HOU | 112 | W 6-3 | 53-59 | 4 | 25,830 | Calvin Schiraldi | Danny Darwin | Eric Show | Dave Smith | Craig Lefferts | 490 | 490 | 0 |
| 1990-08-12 | @ HOU | 113 | W 9-0 | 54-59 | 4 | 14,714 | Derek Lilliquist | Bill Gullickson | Derek Lilliquist | Bill Gullickson | | 499 | 490 | 9 |
| 1990-08-14 | vs MON | 114 | L 3-8 | 54-60 | 4 | 15,855 | Dennis Rasmussen | Dennis Martinez | Dennis Martinez | Dennis Rasmussen | | 502 | 498 | 4 |
| 1990-08-15 | vs MON | 115 | L 3-5 | 54-61 | 4 | 14,271 | Bruce Hurst | Kevin Gross | Bill Sampen | John Davis | | 505 | 503 | 2 |
| 1990-08-16 | vs MON | 116 | W 3-2 | 55-61 | 4 | 14,331 | Ed Whitson | Oil Can Boyd | Rich Rodriguez | Tim Burke | | 508 | 505 | 3 |
| 1990-08-17 | vs PHI | 117 | L 1-2 | 55-62 | 4 | 18,488 | Calvin Schiraldi | Jose De Jesus | Jose De Jesus | Calvin Schiraldi | | 509 | 507 | 2 |
| 1990-08-18 | vs PHI | 118 | W 4-2 | 56-62 | 4 | 35,145 | Andy Benes | Tommy Greene | Andy Benes | Tommy Greene | Craig Lefferts | 513 | 509 | 4 |
| 1990-08-19 | vs PHI | 119 | L 2-3 | 56-63 | 4 | 22,627 | Dennis Rasmussen | Pat Combs | Joe Boever | Dennis Rasmussen | Roger McDowell | 515 | 512 | 3 |
| 1990-08-20 | vs NYN | 120 | W 3-1 | 57-63 | 4 | 22,497 | Bruce Hurst | Sid Fernandez | Bruce Hurst | Sid Fernandez | Craig Lefferts | 518 | 513 | 5 |
| 1990-08-21 | vs NYN | 121 | W 7-0 | 58-63 | 4 | 23,006 | Ed Whitson | Ron Darling | Ed Whitson | Ron Darling | | 525 | 513 | 12 |
| 1990-08-22 | vs NYN | 122 | L 1-4 | 58-64 | 4 | 18,547 | Calvin Schiraldi | Frank Viola | Frank Viola | Calvin Schiraldi | John Franco | 526 | 517 | 9 |
| 1990-08-24 | @ MON | 123 | W 2-1 | 59-64 | 4 | 17,473 | Andy Benes | Dennis Martinez | Andy Benes | Dennis Martinez | Craig Lefferts | 528 | 518 | 10 |
| 1990-08-25 | @ MON | 124 | L 1-2 | 59-65 | 4 | 18,239 | Dennis Rasmussen | Chris Nabholz | Chris Nabholz | Dennis Rasmussen | Mel Rojas | 529 | 520 | 9 |
| 1990-08-26 | @ MON | 125 | L 2-4 | 59-66 | 4 | 27,650 | Bruce Hurst | Kevin Gross | Steve Frey | Bruce Hurst | | 531 | 524 | 7 |
| 1990-08-27 | @ MON | 126 | W 4-1 | 60-66 | 4 | 13,403 | Ed Whitson | Oil Can Boyd | Ed Whitson | Oil Can Boyd | Craig Lefferts | 535 | 525 | 10 |
| 1990-08-28 | @ NYN | 127 | L 0-4 | 60-67 | 4 | 32,744 | Calvin Schiraldi | David Cone | David Cone | Calvin Schiraldi | | 535 | 529 | 6 |
| 1990-08-29 | @ NYN | 128 | L 1-2 | 60-68 | 4 | 30,020 | Andy Benes | Dwight Gooden | Bob Ojeda | Greg Harris | | 536 | 531 | 5 |
| 1990-08-31 | @ PHI | 129 | L 2-4 | 60-69 | 4 | 23,286 | Dennis Rasmussen | Terry Mulholland | Roger McDowell | Atlee Hammaker | | 538 | 535 | 3 |
| 1990-09-01 | @ PHI | 130 | L 2-3 | 60-71 | 4 | 0 | Bruce Hurst | Jason Grimsley | Joe Boever | Greg Harris | | 540 | 538 | 2 |
| 1990-09-01 | @ PHI | 131 | L 1-2 | 60-71 | 4 | 25,008 | Derek Lilliquist | Tommy Greene | Darrel Akerfelds | Rich Rodriguez | Roger McDowell | 541 | 540 | 1 |
| 1990-09-02 | @ PHI | 132 | W 9-1 | 61-71 | 4 | 33,498 | Ed Whitson | Jose De Jesus | Ed Whitson | Jose De Jesus | | 550 | 541 | 9 |
| 1990-09-03 | vs SFN | 133 | L 4-5 | 61-72 | 4 | 17,287 | Calvin Schiraldi | Kelly Downs | Kelly Downs | Calvin Schiraldi | Jeff Brantley | 554 | 546 | 8 |
| 1990-09-04 | vs SFN | 134 | L 4-6 | 61-73 | 5 | 12,162 | Andy Benes | Mike LaCoss | Mike LaCoss | Atlee Hammaker | John Burkett | 558 | 552 | 6 |
| 1990-09-05 | vs HOU | 135 | W 5-2 | 62-73 | 4 | 27,239 | Dennis Rasmussen | Mike Scott | Dennis Rasmussen | Mike Scott | Craig Lefferts | 563 | 554 | 9 |
| 1990-09-06 | vs HOU | 136 | W 3-0 | 63-73 | 4 | 9,244 | Bruce Hurst | Jim Deshaies | Greg Harris | Brian Meyer | | 566 | 554 | 12 |
| 1990-09-07 | vs ATL | 137 | L 1-4 | 63-74 | 4 | 12,449 | Ed Whitson | Charlie Leibrandt | Charlie Leibrandt | Ed Whitson | | 567 | 558 | 9 |
| 1990-09-08 | vs ATL | 138 | L 5-11 | 63-75 | 4 | 12,802 | Calvin Schiraldi | Steve Avery | Jeff Parrett | Derek Lilliquist | | 572 | 569 | 3 |
| 1990-09-09 | vs ATL | 139 | W 5-4 | 64-75 | 4 | 28,593 | Andy Benes | Tom Glavine | Eric Show | Kent Mercker | | 577 | 573 | 4 |
| 1990-09-10 | vs LAN | 140 | W 5-2 | 65-75 | 4 | 11,729 | Dennis Rasmussen | Mike Morgan | Dennis Rasmussen | Tim Crews | Greg Harris | 582 | 575 | 7 |
| 1990-09-11 | vs LAN | 141 | W 4-0 | 66-75 | 4 | 13,758 | Bruce Hurst | Mike Hartley | Bruce Hurst | Mike Hartley | | 586 | 575 | 11 |
| 1990-09-12 | vs LAN | 142 | L 3-10 | 66-76 | 4 | 16,706 | Ed Whitson | Jim Neidlinger | Tim Crews | Atlee Hammaker | Jay Howell | 589 | 585 | 4 |
| 1990-09-14 | @ ATL | 143 | L 3-7 | 66-77 | 4 | 4,395 | Derek Lilliquist | Tom Glavine | Tom Glavine | Derek Lilliquist | Mark Grant | 592 | 592 | 0 |
| 1990-09-15 | @ ATL | 144 | W 5-3 | 67-77 | 4 | 7,390 | Andy Benes | John Smoltz | Craig Lefferts | Jeff Parrett | Eric Show | 597 | 595 | 2 |
| 1990-09-16 | @ ATL | 145 | W 9-4 | 68-77 | 4 | 4,058 | Dennis Rasmussen | Steve Avery | Dennis Rasmussen | Steve Avery | | 606 | 599 | 7 |
| 1990-09-17 | @ HOU | 146 | W 5-0 | 69-77 | 4 | 6,059 | Bruce Hurst | Danny Darwin | Bruce Hurst | Danny Darwin | | 611 | 599 | 12 |
| 1990-09-18 | @ HOU | 147 | W 8-1 | 70-77 | 4 | 5,189 | Ed Whitson | Bill Gullickson | Ed Whitson | Bill Gullickson | | 619 | 600 | 19 |
| 1990-09-19 | @ LAN | 148 | W 9-4 | 71-77 | 4 | 26,996 | Derek Lilliquist | Fernando Valenzuela | Derek Lilliquist | Darren Holmes | Greg Harris | 628 | 604 | 24 |
| 1990-09-20 | @ LAN | 149 | L 2-7 | 71-78 | 4 | 25,277 | Andy Benes | Ramon Martinez | Ramon Martinez | Andy Benes | | 630 | 611 | 19 |
| 1990-09-21 | vs CIN | 150 | L 1-10 | 71-79 | 4 | 44,717 | Dennis Rasmussen | Jose Rijo | Jose Rijo | Dennis Rasmussen | | 631 | 621 | 10 |
| 1990-09-22 | vs CIN | 151 | L 4-6 | 71-81 | 4 | 0 | Bruce Hurst | Scott Scudder | Rob Dibble | Greg Harris | Randy Myers | 635 | 627 | 8 |
| 1990-09-22 | vs CIN | 152 | L 5-9 | 71-81 | 4 | 27,524 | Atlee Hammaker | Tom Browning | Tom Browning | Atlee Hammaker | Rick Mahler | 640 | 636 | 4 |
| 1990-09-23 | vs CIN | 153 | L 2-9 | 71-82 | 4 | 15,410 | Ed Whitson | Danny Jackson | Danny Jackson | Ed Whitson | | 642 | 645 | -3 |
| 1990-09-24 | @ SFN | 154 | L 1-3 | 71-83 | 4 | 11,130 | Derek Lilliquist | Kelly Downs | Kelly Downs | Derek Lilliquist | Steve Bedrosian | 643 | 648 | -5 |
| 1990-09-25 | @ SFN | 155 | L 1-3 | 71-84 | 4 | 10,195 | Andy Benes | Rick Reuschel | Mark Dewey | Andy Benes | Steve Bedrosian | 644 | 651 | -7 |
| 1990-09-26 | @ SFN | 156 | L 6-7 | 71-85 | 5 | 10,193 | Dennis Rasmussen | Don Robinson | Randy O'Neal | Dennis Rasmussen | Steve Bedrosian | 650 | 658 | -8 |
| 1990-09-28 | @ CIN | 157 | W 2-1 | 72-85 | 5 | 35,399 | Bruce Hurst | Danny Jackson | Bruce Hurst | Randy Myers | | 652 | 659 | -7 |
| 1990-09-29 | @ CIN | 158 | W 3-1 | 73-85 | 5 | 37,133 | Ed Whitson | Norm Charlton | Ed Whitson | Norm Charlton | | 655 | 660 | -5 |
| 1990-09-30 | @ CIN | 159 | W 3-0 | 74-85 | 5 | 32,407 | Derek Lilliquist | Jose Rijo | Derek Lilliquist | Jose Rijo | Greg Harris | 658 | 660 | -2 |
| 1990-10-01 | @ LAN | 160 | L 1-2 | 74-86 | 5 | 23,730 | Andy Benes | Ramon Martinez | Ramon Martinez | Andy Benes | | 659 | 662 | -3 |
| 1990-10-02 | @ LAN | 161 | L 7-8 | 74-87 | 5 | 22,883 | Dennis Rasmussen | Mike Morgan | Dave Walsh | Craig Lefferts | | 666 | 670 | -4 |
| 1990-10-03 | @ LAN | 162 | W 7-3 | 75-87 | 5 | 29,930 | Eric Show | Dennis Cook | Eric Show | Dennis Cook | Rich Rodriguez | 673 | 673 | 0 |