| 1990-04-09 | vs CIN | 1 | L 4-8 | - | | 40,957 | Mike Scott | Tom Browning | Randy Myers | Charlie Kerfeld | | 4 | 8 | -4 |
| 1990-04-10 | vs CIN | 2 | L 2-3 | - | | 11,027 | Jim Deshaies | Jose Rijo | Tim Layana | Juan Agosto | Randy Myers | 6 | 11 | -5 |
| 1990-04-11 | vs CIN | 3 | L 0-5 | - | | 11,551 | Mark Portugal | Jack Armstrong | Jack Armstrong | Mark Portugal | Rick Mahler | 6 | 16 | -10 |
| 1990-04-13 | vs LAN | 4 | L 1-6 | - | | 22,067 | Bill Gullickson | Mike Morgan | Mike Morgan | Bill Gullickson | | 7 | 22 | -15 |
| 1990-04-14 | vs LAN | 5 | W 7-3 | - | | 21,736 | Mike Scott | Orel Hershiser | Larry Andersen | John Wetteland | Dave Smith | 14 | 25 | -11 |
| 1990-04-15 | vs LAN | 6 | L 4-5 | - | | 13,402 | Jim Deshaies | Tim Belcher | Jay Howell | Charlie Kerfeld | | 18 | 30 | -12 |
| 1990-04-17 | vs ATL | 7 | W 5-3 | - | | 9,555 | Mark Portugal | John Smoltz | Mark Portugal | John Smoltz | Dave Smith | 23 | 33 | -10 |
| 1990-04-18 | vs ATL | 8 | W 10-5 | - | | 10,137 | Bill Gullickson | Derek Lilliquist | Dan Schatzeder | Derek Lilliquist | | 33 | 38 | -5 |
| 1990-04-19 | @ LAN | 9 | L 3-7 | - | | 38,580 | Mike Scott | Orel Hershiser | Orel Hershiser | Mike Scott | | 36 | 45 | -9 |
| 1990-04-20 | @ LAN | 10 | W 4-2 | - | | 44,533 | Jim Deshaies | Tim Belcher | Jim Deshaies | Tim Belcher | Dave Smith | 40 | 47 | -7 |
| 1990-04-21 | @ LAN | 11 | W 6-5 | - | | 48,434 | Jim Clancy | Fernando Valenzuela | Juan Agosto | Jay Howell | Dave Smith | 46 | 52 | -6 |
| 1990-04-22 | @ LAN | 12 | L 0-2 | - | | 40,520 | Mark Portugal | Ramon Martinez | Ramon Martinez | Mark Portugal | | 46 | 54 | -8 |
| 1990-04-24 | vs MON | 13 | L 3-5 | - | | 9,542 | Mike Scott | Kevin Gross | Kevin Gross | Mike Scott | Tim Burke | 49 | 59 | -10 |
| 1990-04-25 | vs MON | 14 | L 0-1 | - | | 11,251 | Jim Deshaies | Dennis Martinez | Steve Frey | Dave Smith | Tim Burke | 49 | 60 | -11 |
| 1990-04-26 | @ ATL | 15 | W 3-0 | - | | 3,415 | Jim Clancy | Derek Lilliquist | Jim Clancy | Derek Lilliquist | Dave Smith | 52 | 60 | -8 |
| 1990-04-27 | vs NYN | 16 | L 0-1 | - | | 15,862 | Mark Portugal | Frank Viola | Frank Viola | Mark Portugal | John Franco | 52 | 61 | -9 |
| 1990-04-28 | vs NYN | 17 | W 8-4 | - | | 30,217 | Bill Gullickson | Sid Fernandez | Bill Gullickson | Sid Fernandez | Dave Smith | 60 | 65 | -5 |
| 1990-04-29 | vs NYN | 18 | W 2-1 | - | | 20,158 | Mike Scott | Dwight Gooden | Danny Darwin | Julio Machado | | 62 | 66 | -4 |
| 1990-04-30 | @ MON | 19 | W 4-2 | - | | 10,060 | Jim Deshaies | Dennis Martinez | Larry Andersen | Dennis Martinez | Dave Smith | 66 | 68 | -2 |
| 1990-05-01 | @ MON | 20 | L 1-2 | - | | 9,700 | Mark Portugal | Mark Gardner | Drew Hall | Larry Andersen | | 67 | 70 | -3 |
| 1990-05-02 | @ PHI | 21 | L 4-14 | - | | 15,196 | Jim Clancy | Dennis Cook | Dennis Cook | Jim Clancy | | 71 | 84 | -13 |
| 1990-05-03 | @ PHI | 22 | W 10-3 | - | | 13,653 | Bill Gullickson | Terry Mulholland | Bill Gullickson | Terry Mulholland | Dave Smith | 81 | 87 | -6 |
| 1990-05-05 | @ NYN | 23 | W 9-5 | - | | 23,409 | Mike Scott | Dwight Gooden | Mike Scott | Dwight Gooden | Larry Andersen | 90 | 92 | -2 |
| 1990-05-06 | @ NYN | 24 | L 4-7 | - | | 0 | Jim Deshaies | David Cone | John Franco | Dave Smith | | 94 | 99 | -5 |
| 1990-05-06 | @ NYN | 25 | L 6-7 | - | | 32,431 | Mark Portugal | Ron Darling | Alejandro Pena | Dan Schatzeder | | 100 | 106 | -6 |
| 1990-05-07 | @ NYN | 26 | L 1-7 | - | | 22,719 | Jim Clancy | Frank Viola | Frank Viola | Jim Clancy | Wally Whitehurst | 101 | 113 | -12 |
| 1990-05-08 | vs PHI | 27 | W 3-2 | - | | 12,909 | Bill Gullickson | Dennis Cook | Dave Smith | Dickie Noles | | 104 | 115 | -11 |
| 1990-05-09 | vs PHI | 28 | L 1-10 | - | | 11,257 | Mike Scott | Pat Combs | Pat Combs | Mike Scott | | 105 | 125 | -20 |
| 1990-05-11 | @ PIT | 29 | L 3-4 | - | | 24,734 | Jim Deshaies | Doug Drabek | Doug Drabek | Jim Deshaies | Bill Landrum | 108 | 129 | -21 |
| 1990-05-12 | @ PIT | 30 | L 1-3 | - | | 16,066 | Mark Portugal | Neal Heaton | Neal Heaton | Mark Portugal | Ted Power | 109 | 132 | -23 |
| 1990-05-13 | @ PIT | 31 | L 1-5 | - | | 16,658 | Bill Gullickson | Bob Walk | Bob Walk | Bill Gullickson | Bill Landrum | 110 | 137 | -27 |
| 1990-05-15 | @ SLN | 32 | L 0-4 | - | | 16,790 | Mike Scott | Joe Magrane | Joe Magrane | Mike Scott | | 110 | 141 | -31 |
| 1990-05-16 | @ SLN | 33 | L 6-10 | - | | 19,432 | Jim Deshaies | Bryn Smith | Bryn Smith | Jim Deshaies | | 116 | 151 | -35 |
| 1990-05-17 | vs CHN | 34 | W 5-4 | - | | 14,644 | Mark Portugal | Mike Bielecki | Dave Smith | Jose Nunez | | 121 | 155 | -34 |
| 1990-05-18 | vs CHN | 35 | L 0-7 | - | | 22,972 | Bill Gullickson | Mike Harkey | Mike Harkey | Bill Gullickson | | 121 | 162 | -41 |
| 1990-05-19 | vs CHN | 36 | L 1-4 | - | | 32,253 | Jim Clancy | Les Lancaster | Les Lancaster | Jim Clancy | Mitch Williams | 122 | 166 | -44 |
| 1990-05-20 | vs CHN | 37 | L 1-5 | - | | 26,451 | Mike Scott | Shawn Boskie | Shawn Boskie | Mike Scott | | 123 | 171 | -48 |
| 1990-05-21 | vs PIT | 38 | W 3-2 | - | | 8,116 | Jim Deshaies | Doug Drabek | Juan Agosto | Ted Power | | 126 | 173 | -47 |
| 1990-05-22 | vs PIT | 39 | L 4-8 | - | | 8,661 | Dan Schatzeder | Neal Heaton | Neal Heaton | Dan Schatzeder | | 130 | 181 | -51 |
| 1990-05-23 | vs PIT | 40 | W 7-3 | - | | 10,961 | Bill Gullickson | Bob Walk | Juan Agosto | Scott Ruskin | | 137 | 184 | -47 |
| 1990-05-26 | @ CHN | 41 | W 8-1 | - | | 0 | Mike Scott | Shawn Boskie | Mike Scott | Shawn Boskie | | 145 | 185 | -40 |
| 1990-05-26 | @ CHN | 42 | W 12-3 | - | | 31,995 | Jim Deshaies | Greg Maddux | Jim Deshaies | Greg Maddux | Larry Andersen | 157 | 188 | -31 |
| 1990-05-27 | @ CHN | 43 | L 6-11 | - | | 36,395 | Mark Portugal | Mike Bielecki | Mike Bielecki | Mark Portugal | | 163 | 199 | -36 |
| 1990-05-28 | vs SLN | 44 | W 5-1 | - | | 17,229 | Bill Gullickson | Greg Mathews | Bill Gullickson | Greg Mathews | Dave Smith | 168 | 200 | -32 |
| 1990-05-29 | vs SLN | 45 | L 2-3 | - | | 10,897 | Dan Schatzeder | John Tudor | John Tudor | Dan Schatzeder | Lee Smith | 170 | 203 | -33 |
| 1990-05-30 | vs SLN | 46 | W 2-1 | - | | 12,870 | Mike Scott | Joe Magrane | Juan Agosto | Joe Magrane | Dave Smith | 172 | 204 | -32 |
| 1990-05-31 | @ SFN | 47 | W 5-3 | - | | 10,037 | Jim Deshaies | Scott Garrelts | Jim Deshaies | Scott Garrelts | Danny Darwin | 177 | 207 | -30 |
| 1990-06-01 | @ SFN | 48 | L 5-6 | - | | 15,650 | Mark Portugal | Trevor Wilson | Steve Bedrosian | Jim Clancy | | 182 | 213 | -31 |
| 1990-06-02 | @ SFN | 49 | L 4-5 | - | | 20,692 | Bill Gullickson | Bob Knepper | Steve Bedrosian | Danny Darwin | | 186 | 218 | -32 |
| 1990-06-03 | @ SFN | 50 | L 3-7 | - | | 50,295 | Mike Scott | Atlee Hammaker | Atlee Hammaker | Mike Scott | Jeff Brantley | 189 | 225 | -36 |
| 1990-06-04 | @ SDN | 51 | L 2-10 | - | | 16,468 | Jim Clancy | Andy Benes | Andy Benes | Jim Clancy | Craig Lefferts | 191 | 235 | -44 |
| 1990-06-05 | @ SDN | 52 | L 2-11 | - | | 16,941 | Jim Deshaies | Dennis Rasmussen | Dennis Rasmussen | Jim Deshaies | | 193 | 246 | -53 |
| 1990-06-06 | @ SDN | 53 | L 2-3 | - | | 15,665 | Mark Portugal | Mike Dunne | Craig Lefferts | Mark Portugal | | 195 | 249 | -54 |
| 1990-06-07 | vs CIN | 54 | L 1-6 | - | | 15,282 | Bill Gullickson | Jose Rijo | Jose Rijo | Bill Gullickson | | 196 | 255 | -59 |
| 1990-06-08 | vs CIN | 55 | W 3-1 | - | | 23,453 | Mike Scott | Tom Browning | Mike Scott | Randy Myers | | 199 | 256 | -57 |
| 1990-06-09 | vs CIN | 56 | W 4-1 | - | | 26,781 | Jim Clancy | Rick Mahler | Jim Clancy | Rick Mahler | Dave Smith | 203 | 257 | -54 |
| 1990-06-10 | vs CIN | 57 | W 4-2 | - | | 19,076 | Jim Deshaies | Jack Armstrong | Danny Darwin | Jack Armstrong | | 207 | 259 | -52 |
| 1990-06-11 | vs LAN | 58 | W 5-3 | - | | 15,996 | Mark Portugal | Mike Morgan | Larry Andersen | Mike Morgan | Dave Smith | 212 | 262 | -50 |
| 1990-06-12 | vs LAN | 59 | W 5-4 | - | | 14,467 | Bill Gullickson | Mike Maddux | Bill Gullickson | Mike Maddux | Dave Smith | 217 | 266 | -49 |
| 1990-06-13 | vs LAN | 60 | W 5-1 | - | | 18,635 | Mike Scott | Tim Belcher | Mike Scott | Tim Belcher | Danny Darwin | 222 | 267 | -45 |
| 1990-06-15 | @ CIN | 61 | L 3-6 | - | | 30,597 | Jim Clancy | Jack Armstrong | Jack Armstrong | Jim Clancy | Randy Myers | 225 | 273 | -48 |
| 1990-06-16 | @ CIN | 62 | L 2-6 | - | | 36,495 | Jim Deshaies | Danny Jackson | Danny Jackson | Jim Deshaies | Rob Dibble | 227 | 279 | -52 |
| 1990-06-17 | @ CIN | 63 | L 1-7 | - | | 37,650 | Mark Portugal | Jose Rijo | Jose Rijo | Mark Portugal | | 228 | 286 | -58 |
| 1990-06-18 | @ LAN | 64 | L 2-5 | - | | 27,199 | Bill Gullickson | Tim Belcher | Tim Belcher | Bill Gullickson | Jay Howell | 230 | 291 | -61 |
| 1990-06-19 | @ LAN | 65 | L 1-5 | - | | 45,054 | Mike Scott | Fernando Valenzuela | Fernando Valenzuela | Mike Scott | | 231 | 296 | -65 |
| 1990-06-20 | @ LAN | 66 | L 2-3 | - | | 31,376 | Jim Clancy | Ramon Martinez | Ramon Martinez | Jim Clancy | Jay Howell | 233 | 299 | -66 |
| 1990-06-22 | vs SFN | 67 | L 3-4 | - | | 21,258 | Jim Deshaies | Scott Garrelts | Scott Garrelts | Jim Deshaies | Jeff Brantley | 236 | 303 | -67 |
| 1990-06-23 | vs SFN | 68 | W 4-2 | - | | 21,837 | Mark Portugal | Trevor Wilson | Mark Portugal | Steve Bedrosian | Dave Smith | 240 | 305 | -65 |
| 1990-06-24 | vs SFN | 69 | W 8-2 | - | | 22,103 | Bill Gullickson | Don Robinson | Bill Gullickson | Don Robinson | | 248 | 307 | -59 |
| 1990-06-25 | vs SDN | 70 | W 5-3 | - | | 11,674 | Mike Scott | Andy Benes | Mike Scott | Andy Benes | Dave Smith | 253 | 310 | -57 |
| 1990-06-26 | vs SDN | 71 | L 0-7 | - | | 12,771 | Jim Clancy | Dennis Rasmussen | Dennis Rasmussen | Jim Clancy | | 253 | 317 | -64 |
| 1990-06-27 | vs SDN | 72 | W 9-1 | - | | 14,708 | Jim Deshaies | Bruce Hurst | Jim Deshaies | Bruce Hurst | | 262 | 318 | -56 |
| 1990-06-28 | vs SDN | 73 | W 2-1 | - | | 17,603 | Mark Portugal | Ed Whitson | Larry Andersen | Mark Grant | | 264 | 319 | -55 |
| 1990-06-29 | @ PHI | 74 | L 0-2 | - | | 26,339 | Bill Gullickson | Pat Combs | Pat Combs | Bill Gullickson | | 264 | 321 | -57 |
| 1990-06-30 | @ PHI | 75 | W 8-3 | - | | 27,111 | Mike Scott | Marvin Freeman | Mike Scott | Marvin Freeman | Juan Agosto | 272 | 324 | -52 |
| 1990-07-01 | @ PHI | 76 | L 4-8 | - | | 27,014 | Danny Darwin | Jose De Jesus | Roger McDowell | Larry Andersen | | 276 | 332 | -56 |
| 1990-07-02 | @ PHI | 77 | L 1-5 | - | | 32,349 | Jim Deshaies | Bruce Ruffin | Bruce Ruffin | Jim Deshaies | Darrel Akerfelds | 277 | 337 | -60 |
| 1990-07-03 | @ NYN | 78 | L 0-12 | - | | 39,938 | Mark Portugal | Frank Viola | Frank Viola | Mark Portugal | | 277 | 349 | -72 |
| 1990-07-04 | @ NYN | 79 | L 4-7 | - | | 48,072 | Bill Gullickson | Dwight Gooden | Dwight Gooden | Juan Agosto | John Franco | 281 | 356 | -75 |
| 1990-07-05 | @ MON | 80 | L 0-11 | - | | 14,885 | Mike Scott | Mark Gardner | Mark Gardner | Mike Scott | | 281 | 367 | -86 |
| 1990-07-06 | @ MON | 81 | L 2-3 | - | | 15,806 | Danny Darwin | Oil Can Boyd | Bill Sampen | Juan Agosto | Dave J. Schmidt | 283 | 370 | -87 |
| 1990-07-07 | @ MON | 82 | L 1-3 | - | | 20,171 | Jim Deshaies | Zane Smith | Zane Smith | Jim Deshaies | Dave J. Schmidt | 284 | 373 | -89 |
| 1990-07-08 | @ MON | 83 | W 5-3 | - | | 26,016 | Mark Portugal | Dennis Martinez | Mark Portugal | Dennis Martinez | Dave Smith | 289 | 376 | -87 |
| 1990-07-12 | vs PHI | 84 | W 7-4 | - | | 16,983 | Bill Gullickson | Bruce Ruffin | Bill Gullickson | Bruce Ruffin | Dave Smith | 296 | 380 | -84 |
| 1990-07-13 | vs PHI | 85 | L 2-4 | - | | 15,248 | Mike Scott | Jose De Jesus | Jose De Jesus | Mike Scott | Darrel Akerfelds | 298 | 384 | -86 |
| 1990-07-14 | vs PHI | 86 | L 8-12 | - | | 28,308 | Jim Deshaies | Pat Combs | Pat Combs | Jim Deshaies | | 306 | 396 | -90 |
| 1990-07-15 | vs PHI | 87 | W 6-1 | - | | 19,616 | Danny Darwin | Jeff Parrett | Danny Darwin | Jeff Parrett | | 312 | 397 | -85 |
| 1990-07-16 | vs NYN | 88 | W 4-1 | - | | 16,942 | Mark Portugal | Bob Ojeda | Mark Portugal | Bob Ojeda | Larry Andersen | 316 | 398 | -82 |
| 1990-07-17 | vs NYN | 89 | L 2-6 | - | | 18,981 | Bill Gullickson | Dwight Gooden | Dwight Gooden | Bill Gullickson | John Franco | 318 | 404 | -86 |
| 1990-07-18 | vs NYN | 90 | W 1-0 | - | | 18,891 | Mike Scott | Frank Viola | Mike Scott | Alejandro Pena | | 319 | 404 | -85 |
| 1990-07-19 | vs MON | 91 | W 4-3 | - | | 16,312 | Jim Deshaies | Oil Can Boyd | Larry Andersen | Bill Sampen | | 323 | 407 | -84 |
| 1990-07-20 | vs MON | 92 | W 12-6 | - | | 15,734 | Danny Darwin | Kevin Gross | Danny Darwin | Kevin Gross | | 335 | 413 | -78 |
| 1990-07-21 | vs MON | 93 | L 2-3 | - | | 25,427 | Mark Portugal | Zane Smith | Zane Smith | Juan Agosto | Tim Burke | 337 | 416 | -79 |
| 1990-07-22 | vs MON | 94 | W 3-2 | - | | 20,028 | Bill Gullickson | Mark Gardner | Juan Agosto | Dave J. Schmidt | Dave Smith | 340 | 418 | -78 |
| 1990-07-23 | @ ATL | 95 | L 1-3 | - | | 7,888 | Mike Scott | John Smoltz | John Smoltz | Mike Scott | | 341 | 421 | -80 |
| 1990-07-24 | @ ATL | 96 | L 3-9 | - | | 0 | Jim Deshaies | Charlie Leibrandt | Charlie Leibrandt | Jim Deshaies | | 344 | 430 | -86 |
| 1990-07-24 | @ ATL | 97 | L 8-9 | - | | 12,200 | Terry Clark | Tony Castillo | Kent Mercker | Juan Agosto | | 352 | 439 | -87 |
| 1990-07-25 | @ ATL | 98 | W 5-1 | - | | 9,492 | Danny Darwin | Steve Avery | Danny Darwin | Steve Avery | | 357 | 440 | -83 |
| 1990-07-26 | @ SDN | 99 | L 2-8 | - | | 13,538 | Mark Portugal | Eric Show | Eric Show | Mark Portugal | | 359 | 448 | -89 |
| 1990-07-27 | @ SDN | 100 | L 2-6 | - | | 20,244 | Bill Gullickson | Andy Benes | Andy Benes | Bill Gullickson | | 361 | 454 | -93 |
| 1990-07-28 | @ SDN | 101 | W 5-3 | - | | 22,621 | Mike Scott | Dennis Rasmussen | Mike Scott | Dennis Rasmussen | Larry Andersen | 366 | 457 | -91 |
| 1990-07-29 | @ SDN | 102 | L 3-4 | - | | 19,506 | Jim Deshaies | Bruce Hurst | Greg Harris | Dave Smith | Craig Lefferts | 369 | 461 | -92 |
| 1990-07-30 | @ SFN | 103 | W 6-1 | - | | 17,980 | Danny Darwin | Trevor Wilson | Danny Darwin | Steve Bedrosian | | 375 | 462 | -87 |
| 1990-07-31 | @ SFN | 104 | L 2-3 | - | | 24,978 | Mark Portugal | Rafael Novoa | Jeff Brantley | Juan Agosto | | 377 | 465 | -88 |
| 1990-08-02 | vs ATL | 105 | W 3-1 | - | | 18,251 | Bill Gullickson | Tom Glavine | Bill Gullickson | Tom Glavine | Larry Andersen | 380 | 466 | -86 |
| 1990-08-03 | vs ATL | 106 | W 3-0 | - | | 17,579 | Mike Scott | John Smoltz | Mike Scott | John Smoltz | | 383 | 466 | -83 |
| 1990-08-04 | vs ATL | 107 | W 6-2 | - | | 18,751 | Jim Deshaies | Charlie Leibrandt | Jim Deshaies | Charlie Leibrandt | | 389 | 468 | -79 |
| 1990-08-05 | vs ATL | 108 | W 6-2 | - | | 15,118 | Danny Darwin | Steve Avery | Danny Darwin | Steve Avery | | 395 | 470 | -75 |
| 1990-08-06 | vs SFN | 109 | W 4-1 | - | | 17,251 | Bill Gullickson | Don Robinson | Bill Gullickson | Don Robinson | | 399 | 471 | -72 |
| 1990-08-07 | vs SFN | 110 | W 4-0 | - | | 18,648 | Mark Portugal | John Burkett | Mark Portugal | John Burkett | Dave Smith | 403 | 471 | -68 |
| 1990-08-08 | vs SFN | 111 | L 4-8 | - | | 20,110 | Mike Scott | Trevor Wilson | Trevor Wilson | Juan Agosto | Mark Thurmond | 407 | 479 | -72 |
| 1990-08-10 | vs SDN | 112 | L 0-2 | - | | 16,576 | Jim Deshaies | Ed Whitson | Ed Whitson | Jim Deshaies | Craig Lefferts | 407 | 481 | -74 |
| 1990-08-11 | vs SDN | 113 | L 3-6 | - | | 25,830 | Danny Darwin | Calvin Schiraldi | Eric Show | Dave Smith | Craig Lefferts | 410 | 487 | -77 |
| 1990-08-12 | vs SDN | 114 | L 0-9 | - | | 14,714 | Bill Gullickson | Derek Lilliquist | Derek Lilliquist | Bill Gullickson | | 410 | 496 | -86 |
| 1990-08-13 | @ CHN | 115 | W 7-2 | - | | 34,087 | Mark Portugal | Lance Dickson | Mark Portugal | Lance Dickson | | 417 | 498 | -81 |
| 1990-08-14 | @ CHN | 116 | L 2-5 | - | | 34,843 | Mike Scott | Greg Maddux | Greg Maddux | Mike Scott | Bill Long | 419 | 503 | -84 |
| 1990-08-15 | @ CHN | 117 | W 8-4 | - | | 34,307 | Jim Deshaies | Mike Bielecki | Dave Smith | Jeff Pico | | 427 | 507 | -80 |
| 1990-08-16 | @ SLN | 118 | W 4-2 | - | | 23,756 | Danny Darwin | Joe Magrane | Danny Darwin | Joe Magrane | Dave Smith | 431 | 509 | -78 |
| 1990-08-17 | @ SLN | 119 | L 0-5 | - | | 33,934 | Bill Gullickson | Bob Tewksbury | Bob Tewksbury | Bill Gullickson | | 431 | 514 | -83 |
| 1990-08-18 | @ SLN | 120 | W 3-2 | - | | 40,609 | Mark Portugal | Omar Olivares | Dave Smith | Frank DiPino | | 434 | 516 | -82 |
| 1990-08-19 | @ SLN | 121 | L 3-7 | - | | 32,165 | Mike Scott | Jose DeLeon | Jose DeLeon | Mike Scott | | 437 | 523 | -86 |
| 1990-08-20 | @ PIT | 122 | L 1-7 | - | | 20,997 | Jim Deshaies | Neal Heaton | Neal Heaton | Jim Deshaies | | 438 | 530 | -92 |
| 1990-08-21 | @ PIT | 123 | W 2-1 | - | | 14,062 | Danny Darwin | Randy Tomlin | Danny Darwin | Bob Patterson | | 440 | 531 | -91 |
| 1990-08-22 | @ PIT | 124 | L 2-4 | - | | 29,420 | Bill Gullickson | John Smiley | John Smiley | Bill Gullickson | Bill Landrum | 442 | 535 | -93 |
| 1990-08-23 | @ ATL | 125 | W 8-3 | - | | 34,023 | Mark Portugal | Charlie Leibrandt | Mark Portugal | Charlie Leibrandt | | 450 | 538 | -88 |
| 1990-08-24 | vs SLN | 126 | L 2-3 | - | | 16,459 | Mike Scott | Omar Olivares | Scott Terry | Dave Smith | Lee Smith | 452 | 541 | -89 |
| 1990-08-25 | vs SLN | 127 | W 6-4 | - | | 22,410 | Jim Deshaies | Jose DeLeon | Jim Deshaies | Jose DeLeon | Juan Agosto | 458 | 545 | -87 |
| 1990-08-26 | vs SLN | 128 | W 4-2 | - | | 17,216 | Danny Darwin | Ken Hill | Danny Darwin | Ken Hill | | 462 | 547 | -85 |
| 1990-08-28 | vs CHN | 129 | L 2-5 | - | | 12,150 | Bill Gullickson | Greg Maddux | Greg Maddux | Bill Gullickson | | 464 | 552 | -88 |
| 1990-08-29 | vs CHN | 130 | W 1-0 | - | | 11,211 | Mark Portugal | Rick Sutcliffe | Mark Portugal | Rick Sutcliffe | Larry Andersen | 465 | 552 | -87 |
| 1990-08-31 | vs PIT | 131 | W 3-2 | - | | 10,892 | Mike Scott | Zane Smith | Juan Agosto | Bob Patterson | | 468 | 554 | -86 |
| 1990-09-01 | vs PIT | 132 | W 2-1 | - | | 16,422 | Jim Deshaies | Randy Tomlin | Dave Smith | Ted Power | | 470 | 555 | -85 |
| 1990-09-02 | vs PIT | 133 | L 6-7 | - | | 16,598 | Danny Darwin | John Smiley | John Smiley | Danny Darwin | Bob Kipper | 476 | 562 | -86 |
| 1990-09-03 | @ LAN | 134 | W 7-3 | - | | 42,856 | Bill Gullickson | Fernando Valenzuela | Bill Gullickson | Fernando Valenzuela | Dave Smith | 483 | 565 | -82 |
| 1990-09-04 | @ LAN | 135 | W 10-8 | - | | 28,939 | Mark Portugal | Ramon Martinez | Al Osuna | Jim Gott | Dave Smith | 493 | 573 | -80 |
| 1990-09-05 | @ SDN | 136 | L 2-5 | - | | 27,239 | Mike Scott | Dennis Rasmussen | Dennis Rasmussen | Mike Scott | Craig Lefferts | 495 | 578 | -83 |
| 1990-09-06 | @ SDN | 137 | L 0-3 | - | | 9,244 | Jim Deshaies | Bruce Hurst | Greg Harris | Brian Meyer | | 495 | 581 | -86 |
| 1990-09-07 | @ SFN | 138 | W 2-1 | - | | 18,153 | Danny Darwin | John Burkett | Danny Darwin | John Burkett | Dave Smith | 497 | 582 | -85 |
| 1990-09-08 | @ SFN | 139 | L 1-2 | - | | 28,215 | Bill Gullickson | Kelly Downs | Steve Bedrosian | Brian Meyer | | 498 | 584 | -86 |
| 1990-09-09 | @ SFN | 140 | L 1-5 | - | | 23,229 | Mark Portugal | Mike LaCoss | Mike LaCoss | Mark Portugal | | 499 | 589 | -90 |
| 1990-09-11 | @ CIN | 141 | L 3-5 | - | | 19,570 | Jim Deshaies | Norm Charlton | Norm Charlton | Jim Deshaies | Randy Myers | 502 | 594 | -92 |
| 1990-09-12 | @ CIN | 142 | W 3-1 | - | | 17,083 | Danny Darwin | Jose Rijo | Juan Agosto | Tim Layana | Brian Meyer | 505 | 595 | -90 |
| 1990-09-13 | @ CIN | 143 | L 5-7 | - | | 17,820 | Bill Gullickson | Rick Mahler | Rob Dibble | Brian Meyer | | 510 | 602 | -92 |
| 1990-09-14 | vs SFN | 144 | W 2-1 | - | | 10,178 | Mark Portugal | Kelly Downs | Mark Portugal | Kelly Downs | Juan Agosto | 512 | 603 | -91 |
| 1990-09-15 | vs SFN | 145 | W 3-2 | - | | 13,370 | Mike Scott | Mike LaCoss | Xavier Hernandez | Steve Bedrosian | | 515 | 605 | -90 |
| 1990-09-16 | vs SFN | 146 | W 3-2 | - | | 9,937 | Jim Deshaies | Don Robinson | Juan Agosto | Don Robinson | | 518 | 607 | -89 |
| 1990-09-17 | vs SDN | 147 | L 0-5 | - | | 6,059 | Danny Darwin | Bruce Hurst | Bruce Hurst | Danny Darwin | | 518 | 612 | -94 |
| 1990-09-18 | vs SDN | 148 | L 1-8 | - | | 5,189 | Bill Gullickson | Ed Whitson | Ed Whitson | Bill Gullickson | | 519 | 620 | -101 |
| 1990-09-19 | vs CIN | 149 | W 5-2 | - | | 8,570 | Mark Portugal | Danny Jackson | Mark Portugal | Danny Jackson | Juan Agosto | 524 | 622 | -98 |
| 1990-09-20 | vs CIN | 150 | W 3-2 | - | | 7,895 | Mike Scott | Norm Charlton | Xavier Hernandez | Randy Myers | | 527 | 624 | -97 |
| 1990-09-21 | @ ATL | 151 | W 4-3 | - | | 6,081 | Jim Deshaies | Steve Avery | Juan Agosto | Kent Mercker | | 531 | 627 | -96 |
| 1990-09-22 | @ ATL | 152 | L 1-3 | - | | 13,635 | Danny Darwin | Charlie Leibrandt | Charlie Leibrandt | Danny Darwin | | 532 | 630 | -98 |
| 1990-09-23 | @ ATL | 153 | L 0-3 | - | | 9,060 | Bill Gullickson | Paul Marak | Paul Marak | Bill Gullickson | | 532 | 633 | -101 |
| 1990-09-24 | vs LAN | 154 | L 5-7 | - | | 6,936 | Mark Portugal | Fernando Valenzuela | Jim Gott | Dave Smith | | 537 | 640 | -103 |
| 1990-09-25 | vs LAN | 155 | L 1-3 | - | | 7,093 | Mike Scott | Ramon Martinez | Jay Howell | Juan Agosto | | 538 | 643 | -105 |
| 1990-09-26 | vs LAN | 156 | W 10-1 | - | | 13,790 | Jim Deshaies | Mike Morgan | Jim Deshaies | Mike Morgan | | 548 | 644 | -96 |
| 1990-09-28 | vs ATL | 157 | W 2-1 | - | | 11,045 | Danny Darwin | Paul Marak | Al Osuna | Kent Mercker | | 550 | 645 | -95 |
| 1990-09-29 | vs ATL | 158 | W 9-0 | - | | 8,129 | Bill Gullickson | Charlie Leibrandt | Bill Gullickson | Charlie Leibrandt | | 559 | 645 | -86 |
| 1990-09-30 | vs ATL | 159 | W 6-2 | - | | 14,387 | Mark Portugal | Tom Glavine | Mark Portugal | Tom Glavine | Jim Clancy | 565 | 647 | -82 |
| 1990-10-01 | @ CIN | 160 | L 3-4 | - | | 12,064 | Jim Deshaies | Tom Browning | Randy Myers | Brian Meyer | | 568 | 651 | -83 |
| 1990-10-02 | @ CIN | 161 | L 2-3 | - | | 11,202 | Xavier Hernandez | Jack Armstrong | Scott Scudder | Xavier Hernandez | Randy Myers | 570 | 654 | -84 |
| 1990-10-03 | @ CIN | 162 | W 3-2 | - | | 10,150 | Randy Hennis | Danny Jackson | Dave Smith | Tim Birtsas | | 573 | 656 | -83 |