| 1990-04-09 | vs MON | 1 | W 6-5 | 1-0 | 2 | 48,752 | Joe Magrane | Dennis Martinez | Ken Dayley | Mark Gardner | | 6 | 5 | 1 |
| 1990-04-10 | vs MON | 2 | W 4-2 | 2-0 | 3 | 22,571 | Bryn Smith | Zane Smith | Bryn Smith | Zane Smith | Scott Terry | 10 | 7 | 3 |
| 1990-04-11 | vs MON | 3 | L 4-6 | 2-1 | 2 | 26,174 | Jose DeLeon | Oil Can Boyd | Oil Can Boyd | Greg Mathews | Tim Burke | 14 | 13 | 1 |
| 1990-04-13 | @ PHI | 4 | W 11-0 | 3-1 | 2 | 32,173 | John Tudor | Ken Howell | John Tudor | Ken Howell | Bob Tewksbury | 25 | 13 | 12 |
| 1990-04-14 | @ PHI | 5 | L 2-6 | 3-2 | 2 | 15,613 | Joe Magrane | Bruce Ruffin | Bruce Ruffin | Joe Magrane | Jeff Parrett | 27 | 19 | 8 |
| 1990-04-15 | @ PHI | 6 | L 0-4 | 3-3 | 5 | 14,435 | Bryn Smith | Dennis Cook | Dennis Cook | Bryn Smith | Roger McDowell | 27 | 23 | 4 |
| 1990-04-16 | @ PIT | 7 | W 6-4 | 4-3 | 3 | 7,136 | Jose DeLeon | John Smiley | Jose DeLeon | John Smiley | Ricky Horton | 33 | 27 | 6 |
| 1990-04-17 | @ PIT | 8 | L 2-7 | 4-4 | 4 | 3,981 | Greg Mathews | Neal Heaton | Neal Heaton | Greg Mathews | | 35 | 34 | 1 |
| 1990-04-18 | @ PIT | 9 | W 3-0 | 5-4 | 3 | 11,626 | John Tudor | Bob Walk | John Tudor | Bob Walk | Ken Dayley | 38 | 34 | 4 |
| 1990-04-19 | vs PIT | 10 | L 1-5 | 5-5 | 4 | 20,495 | Joe Magrane | Doug Drabek | Doug Drabek | Joe Magrane | | 39 | 39 | 0 |
| 1990-04-20 | vs PHI | 11 | L 0-3 | 5-6 | 5 | 29,343 | Bryn Smith | Dennis Cook | Dennis Cook | Bryn Smith | | 39 | 42 | -3 |
| 1990-04-21 | vs PHI | 12 | L 6-7 | 5-7 | 6 | 39,798 | Jose DeLeon | Terry Mulholland | Roger McDowell | Scott Terry | | 45 | 49 | -4 |
| 1990-04-22 | vs PHI | 13 | L 3-5 | 5-8 | 6 | 36,819 | Greg Mathews | Pat Combs | Pat Combs | Ricky Horton | Roger McDowell | 48 | 54 | -6 |
| 1990-04-23 | vs PIT | 14 | W 7-4 | 6-8 | 6 | 22,748 | John Tudor | Bob Walk | John Tudor | Bob Walk | | 55 | 58 | -3 |
| 1990-04-24 | @ LAN | 15 | L 0-3 | 6-9 | 6 | 27,366 | Joe Magrane | Mike Morgan | Mike Morgan | Joe Magrane | | 55 | 61 | -6 |
| 1990-04-25 | @ LAN | 16 | W 5-1 | 7-9 | 5 | 32,584 | Bryn Smith | Orel Hershiser | Bryn Smith | Orel Hershiser | | 60 | 62 | -2 |
| 1990-04-26 | @ LAN | 17 | W 7-1 | 8-9 | 5 | 27,609 | Jose DeLeon | Tim Belcher | Jose DeLeon | Tim Belcher | | 67 | 63 | 4 |
| 1990-04-27 | @ SFN | 18 | L 3-12 | 8-10 | 5 | 19,516 | Greg Mathews | Atlee Hammaker | Atlee Hammaker | Greg Mathews | | 70 | 75 | -5 |
| 1990-04-28 | @ SFN | 19 | W 5-0 | 9-10 | 5 | 21,963 | John Tudor | Scott Garrelts | John Tudor | Scott Garrelts | | 75 | 75 | 0 |
| 1990-04-29 | @ SFN | 20 | L 7-9 | 9-11 | 5 | 34,969 | Joe Magrane | Rick Reuschel | Rick Reuschel | Joe Magrane | Steve Bedrosian | 82 | 84 | -2 |
| 1990-05-01 | @ SDN | 21 | W 2-1 | 10-11 | 4 | 18,562 | Bryn Smith | Ed Whitson | Bryn Smith | Ed Whitson | Scott Terry | 84 | 85 | -1 |
| 1990-05-02 | @ SDN | 22 | L 3-4 | 10-12 | 6 | 18,697 | Jose DeLeon | Bruce Hurst | Bruce Hurst | Jose DeLeon | Craig Lefferts | 87 | 89 | -2 |
| 1990-05-04 | vs CIN | 23 | L 3-8 | 10-13 | 6 | 41,655 | John Tudor | Ron Robinson | Ron Robinson | John Tudor | Rob Dibble | 90 | 97 | -7 |
| 1990-05-05 | vs CIN | 24 | L 2-4 | 10-14 | 6 | 44,552 | Joe Magrane | Jose Rijo | Jose Rijo | Joe Magrane | Randy Myers | 92 | 101 | -9 |
| 1990-05-06 | vs CIN | 25 | L 1-5 | 10-15 | 6 | 38,772 | Bryn Smith | Scott Scudder | Scott Scudder | Bryn Smith | Norm Charlton | 93 | 106 | -13 |
| 1990-05-07 | vs CIN | 26 | L 0-3 | 10-16 | 6 | 28,018 | Jose DeLeon | Tom Browning | Tom Browning | Jose DeLeon | | 93 | 109 | -16 |
| 1990-05-09 | vs SDN | 27 | W 11-5 | 11-16 | 6 | 19,717 | John Tudor | Andy Benes | Ricky Horton | Andy Benes | | 104 | 114 | -10 |
| 1990-05-10 | vs SDN | 28 | L 1-9 | 11-17 | 6 | 28,597 | Joe Magrane | Dennis Rasmussen | Dennis Rasmussen | Joe Magrane | | 105 | 123 | -18 |
| 1990-05-11 | vs ATL | 29 | W 5-2 | 12-17 | 6 | 41,408 | Bryn Smith | John Smoltz | Bryn Smith | John Smoltz | Lee Smith | 110 | 125 | -15 |
| 1990-05-12 | vs ATL | 30 | W 4-3 | 13-17 | 6 | 30,068 | Jose DeLeon | Derek Lilliquist | Lee Smith | Joe Boever | | 114 | 128 | -14 |
| 1990-05-13 | vs ATL | 31 | L 1-3 | 13-18 | 6 | 29,022 | Greg Mathews | Marty Clary | Tony Castillo | Scott Terry | Joe Boever | 115 | 131 | -16 |
| 1990-05-15 | vs HOU | 32 | W 4-0 | 14-18 | 6 | 16,790 | Joe Magrane | Mike Scott | Joe Magrane | Mike Scott | | 119 | 131 | -12 |
| 1990-05-16 | vs HOU | 33 | W 10-6 | 15-18 | 6 | 19,432 | Bryn Smith | Jim Deshaies | Bryn Smith | Jim Deshaies | | 129 | 137 | -8 |
| 1990-05-17 | @ CIN | 34 | W 3-0 | 16-18 | 5 | 22,741 | Jose DeLeon | Tom Browning | Jose DeLeon | Tom Browning | Lee Smith | 132 | 137 | -5 |
| 1990-05-18 | @ CIN | 35 | L 0-1 | 16-19 | 6 | 34,968 | Greg Mathews | Ron Robinson | Norm Charlton | Ken Dayley | | 132 | 138 | -6 |
| 1990-05-19 | @ CIN | 36 | L 0-4 | 16-20 | 6 | 36,005 | John Tudor | Jack Armstrong | Jack Armstrong | John Tudor | | 132 | 142 | -10 |
| 1990-05-20 | @ CIN | 37 | W 6-2 | 17-20 | 6 | 32,249 | Joe Magrane | Danny Jackson | Joe Magrane | Danny Jackson | | 138 | 144 | -6 |
| 1990-05-21 | @ ATL | 38 | L 5-6 | 17-21 | 6 | 6,237 | Bryn Smith | John Smoltz | Joe Boever | Scott Terry | | 143 | 150 | -7 |
| 1990-05-22 | @ ATL | 39 | W 4-3 | 18-21 | 6 | 11,313 | Jose DeLeon | Derek Lilliquist | Jose DeLeon | Derek Lilliquist | Lee Smith | 147 | 153 | -6 |
| 1990-05-23 | vs SFN | 40 | L 1-6 | 18-22 | 6 | 35,760 | Greg Mathews | Bob Knepper | Bob Knepper | Greg Mathews | | 148 | 159 | -11 |
| 1990-05-24 | vs SFN | 41 | W 3-2 | 19-22 | 6 | 34,253 | John Tudor | Don Robinson | Frank DiPino | Ed Vosberg | | 151 | 161 | -10 |
| 1990-05-25 | vs LAN | 42 | L 1-4 | 19-23 | 6 | 36,264 | Joe Magrane | Ramon Martinez | Ramon Martinez | Joe Magrane | | 152 | 165 | -13 |
| 1990-05-26 | vs LAN | 43 | L 0-8 | 19-24 | 6 | 47,077 | Bryn Smith | Mike Morgan | Mike Morgan | Bryn Smith | | 152 | 173 | -21 |
| 1990-05-27 | vs LAN | 44 | L 7-14 | 19-25 | 6 | 45,895 | Jose DeLeon | John Wetteland | Tim Crews | Jose DeLeon | | 159 | 187 | -28 |
| 1990-05-28 | @ HOU | 45 | L 1-5 | 19-26 | 6 | 17,229 | Greg Mathews | Bill Gullickson | Bill Gullickson | Greg Mathews | Dave Smith | 160 | 192 | -32 |
| 1990-05-29 | @ HOU | 46 | W 3-2 | 20-26 | 6 | 10,897 | John Tudor | Dan Schatzeder | John Tudor | Dan Schatzeder | Lee Smith | 163 | 194 | -31 |
| 1990-05-30 | @ HOU | 47 | L 1-2 | 20-27 | 6 | 12,870 | Joe Magrane | Mike Scott | Juan Agosto | Joe Magrane | Dave Smith | 164 | 196 | -32 |
| 1990-06-01 | vs CHN | 48 | W 6-4 | 21-27 | 6 | 43,773 | Jose DeLeon | Greg Maddux | Jose DeLeon | Greg Maddux | Lee Smith | 170 | 200 | -30 |
| 1990-06-02 | vs CHN | 49 | L 6-7 | 21-28 | 6 | 48,051 | Greg Mathews | Mike Bielecki | Les Lancaster | Lee Smith | Mitch Williams | 176 | 207 | -31 |
| 1990-06-03 | vs CHN | 50 | W 7-4 | 22-28 | 6 | 45,393 | Bryn Smith | Kevin Blankenship | Bryn Smith | Kevin Blankenship | | 183 | 211 | -28 |
| 1990-06-04 | vs PHI | 51 | W 3-2 | 23-28 | 4 | 29,937 | John Tudor | Terry Mulholland | Frank DiPino | Marvin Freeman | | 186 | 213 | -27 |
| 1990-06-05 | vs PHI | 52 | L 6-9 | 23-29 | 5 | 26,522 | Joe Magrane | Bruce Ruffin | Don Carman | Scott Terry | | 192 | 222 | -30 |
| 1990-06-06 | vs PHI | 53 | W 12-11 | 24-29 | 5 | 28,319 | Greg Mathews | Dennis Cook | Frank DiPino | Roger McDowell | | 204 | 233 | -29 |
| 1990-06-07 | @ MON | 54 | L 2-3 | 24-30 | 5 | 15,360 | Jose DeLeon | Zane Smith | Zane Smith | Jose DeLeon | Dave J. Schmidt | 206 | 236 | -30 |
| 1990-06-08 | @ MON | 55 | L 2-18 | 24-31 | 5 | 20,127 | Bryn Smith | Dennis Martinez | Dennis Martinez | Bryn Smith | | 208 | 254 | -46 |
| 1990-06-09 | @ MON | 56 | L 1-3 | 24-32 | 6 | 27,388 | Scott Terry | Mark Gardner | Mark Gardner | Scott Terry | Dave J. Schmidt | 209 | 257 | -48 |
| 1990-06-10 | @ MON | 57 | W 5-3 | 25-32 | 6 | 30,349 | Joe Magrane | Oil Can Boyd | Joe Magrane | Oil Can Boyd | Lee Smith | 214 | 260 | -46 |
| 1990-06-11 | vs PIT | 58 | L 7-8 | 25-33 | 6 | 27,403 | Greg Mathews | Doug Drabek | Stan Belinda | Tom Niedenfuer | Bill Landrum | 221 | 268 | -47 |
| 1990-06-12 | vs PIT | 59 | L 3-6 | 25-34 | 6 | 30,815 | Jose DeLeon | Neal Heaton | Neal Heaton | Jose DeLeon | Bill Landrum | 224 | 274 | -50 |
| 1990-06-13 | vs PIT | 60 | L 5-6 | 25-35 | 6 | 26,926 | John Tudor | Bob Walk | Mark Huismann | Frank DiPino | Rick Reed | 229 | 280 | -51 |
| 1990-06-14 | vs MON | 61 | L 2-3 | 25-36 | 6 | 33,575 | Bryn Smith | Mark Gardner | Bill Sampen | Tom Niedenfuer | Dave J. Schmidt | 231 | 283 | -52 |
| 1990-06-15 | vs MON | 62 | L 4-7 | 25-37 | 6 | 34,377 | Joe Magrane | Oil Can Boyd | Steve Frey | Joe Magrane | Dave J. Schmidt | 235 | 290 | -55 |
| 1990-06-16 | vs MON | 63 | W 5-3 | 26-37 | 5 | 43,553 | Bob Tewksbury | Kevin Gross | Bob Tewksbury | Drew Hall | Tom Niedenfuer | 240 | 293 | -53 |
| 1990-06-17 | vs MON | 64 | W 7-1 | 27-37 | 5 | 34,810 | Jose DeLeon | Zane Smith | Jose DeLeon | Zane Smith | | 247 | 294 | -47 |
| 1990-06-19 | @ NYN | 65 | L 0-6 | 27-38 | 6 | 27,668 | John Tudor | David Cone | David Cone | John Tudor | | 247 | 300 | -53 |
| 1990-06-20 | @ NYN | 66 | L 3-6 | 27-39 | 6 | 35,237 | Bryn Smith | Sid Fernandez | Sid Fernandez | Bryn Smith | John Franco | 250 | 306 | -56 |
| 1990-06-22 | @ CHN | 67 | W 7-0 | 28-39 | 5 | 30,764 | Joe Magrane | Steve Wilson | Joe Magrane | Steve Wilson | | 257 | 306 | -49 |
| 1990-06-23 | @ CHN | 68 | W 8-7 | 29-39 | 5 | 33,721 | Bob Tewksbury | Mike Bielecki | Bob Tewksbury | Mike Bielecki | Lee Smith | 265 | 313 | -48 |
| 1990-06-24 | @ CHN | 69 | L 2-3 | 29-40 | 5 | 34,229 | Jose DeLeon | Mike Harkey | Paul Assenmacher | Tom Niedenfuer | | 267 | 316 | -49 |
| 1990-06-25 | vs NYN | 70 | L 2-3 | 29-41 | 5 | 33,598 | John Tudor | David Cone | David Cone | Lee Smith | John Franco | 269 | 319 | -50 |
| 1990-06-26 | vs NYN | 71 | L 6-8 | 29-42 | 5 | 32,220 | Bryn Smith | Ron Darling | Alejandro Pena | Ken Dayley | | 275 | 327 | -52 |
| 1990-06-27 | vs NYN | 72 | L 2-5 | 29-43 | 6 | 31,705 | Joe Magrane | Frank Viola | Frank Viola | Joe Magrane | | 277 | 332 | -55 |
| 1990-06-28 | vs PIT | 73 | W 5-1 | 30-43 | 6 | 22,602 | Bob Tewksbury | Doug Drabek | Bob Tewksbury | Doug Drabek | Lee Smith | 282 | 333 | -51 |
| 1990-06-29 | @ LAN | 74 | L 0-6 | 30-44 | 6 | 38,583 | Jose DeLeon | Fernando Valenzuela | Fernando Valenzuela | Jose DeLeon | | 282 | 339 | -57 |
| 1990-06-30 | @ LAN | 75 | W 6-5 | 31-44 | 6 | 39,914 | John Tudor | Ramon Martinez | John Tudor | Jim Gott | Lee Smith | 288 | 344 | -56 |
| 1990-07-01 | @ LAN | 76 | W 6-5 | 32-44 | 6 | 35,265 | Scott Terry | Mike Morgan | Frank DiPino | Tim Crews | Lee Smith | 294 | 349 | -55 |
| 1990-07-02 | @ SFN | 77 | L 2-3 | 32-45 | 6 | 15,396 | Joe Magrane | Don Robinson | Don Robinson | Joe Magrane | Jeff Brantley | 296 | 352 | -56 |
| 1990-07-03 | @ SFN | 78 | L 0-4 | 32-46 | 6 | 48,900 | Bob Tewksbury | Trevor Wilson | Trevor Wilson | Bob Tewksbury | | 296 | 356 | -60 |
| 1990-07-04 | @ SFN | 79 | L 2-9 | 32-47 | 6 | 25,538 | Jose DeLeon | John Burkett | John Burkett | Jose DeLeon | Jeff Brantley | 298 | 365 | -67 |
| 1990-07-05 | @ SDN | 80 | W 4-1 | 33-47 | 6 | 15,502 | Bryn Smith | Andy Benes | Lee Smith | Greg Harris | | 302 | 366 | -64 |
| 1990-07-06 | @ SDN | 81 | W 5-3 | 34-47 | 6 | 16,992 | John Tudor | Dennis Rasmussen | John Tudor | Dennis Rasmussen | Lee Smith | 307 | 369 | -62 |
| 1990-07-07 | @ SDN | 82 | L 1-3 | 34-48 | 6 | 51,124 | Joe Magrane | Bruce Hurst | Bruce Hurst | Joe Magrane | | 308 | 372 | -64 |
| 1990-07-08 | @ SDN | 83 | W 4-1 | 35-48 | 6 | 17,174 | Bob Tewksbury | Ed Whitson | Bob Tewksbury | Ed Whitson | | 312 | 373 | -61 |
| 1990-07-12 | vs SFN | 84 | L 2-4 | 35-49 | 6 | 32,136 | Bryn Smith | Scott Garrelts | Scott Garrelts | Bryn Smith | | 314 | 377 | -63 |
| 1990-07-13 | vs SFN | 85 | L 1-6 | 35-50 | 6 | 35,961 | Jose DeLeon | Don Robinson | Don Robinson | Jose DeLeon | Jeff Brantley | 315 | 383 | -68 |
| 1990-07-14 | vs SFN | 86 | W 2-1 | 36-50 | 5 | 43,690 | Joe Magrane | Trevor Wilson | Lee Smith | Trevor Wilson | | 317 | 384 | -67 |
| 1990-07-15 | vs SFN | 87 | L 3-5 | 36-51 | 6 | 29,624 | John Tudor | John Burkett | Steve Bedrosian | Tom Niedenfuer | Jeff Brantley | 320 | 389 | -69 |
| 1990-07-16 | vs LAN | 88 | L 2-5 | 36-52 | 6 | 25,405 | Bob Tewksbury | Terry Wells | Terry Wells | Bob Tewksbury | Jay Howell | 322 | 394 | -72 |
| 1990-07-17 | vs LAN | 89 | W 3-0 | 37-52 | 6 | 25,716 | Bryn Smith | Fernando Valenzuela | Bryn Smith | Fernando Valenzuela | Lee Smith | 325 | 394 | -69 |
| 1990-07-18 | vs LAN | 90 | L 1-6 | 37-53 | 6 | 25,328 | Jose DeLeon | Ramon Martinez | Ramon Martinez | Jose DeLeon | Jay Howell | 326 | 400 | -74 |
| 1990-07-19 | vs SDN | 91 | W 8-3 | 38-53 | 6 | 29,688 | Joe Magrane | Bruce Hurst | Joe Magrane | Bruce Hurst | Frank DiPino | 334 | 403 | -69 |
| 1990-07-20 | vs SDN | 92 | W 4-2 | 39-53 | 6 | 28,298 | John Tudor | Ed Whitson | John Tudor | Ed Whitson | Lee Smith | 338 | 405 | -67 |
| 1990-07-21 | vs SDN | 93 | W 4-2 | 40-53 | 6 | 38,535 | Bob Tewksbury | Eric Show | Bob Tewksbury | Eric Show | Frank DiPino | 342 | 407 | -65 |
| 1990-07-22 | vs SDN | 94 | W 6-4 | 41-53 | 6 | 31,261 | Bryn Smith | Derek Lilliquist | Ken Dayley | Greg Harris | Lee Smith | 348 | 411 | -63 |
| 1990-07-23 | vs CHN | 95 | L 1-3 | 41-54 | 6 | 40,534 | Jose DeLeon | Greg Maddux | Greg Maddux | Jose DeLeon | Mitch Williams | 349 | 414 | -65 |
| 1990-07-24 | vs CHN | 96 | W 9-4 | 42-54 | 6 | 38,974 | Joe Magrane | Steve Wilson | Scott Terry | Steve Wilson | | 358 | 418 | -60 |
| 1990-07-25 | vs CHN | 97 | W 9-0 | 43-54 | 6 | 37,826 | John Tudor | Mike Harkey | John Tudor | Mike Harkey | | 367 | 418 | -51 |
| 1990-07-26 | @ NYN | 98 | L 1-6 | 44-55 | 6 | 0 | Bob Tewksbury | Ron Darling | Ron Darling | Bob Tewksbury | | 368 | 424 | -56 |
| 1990-07-26 | @ NYN | 99 | W 3-1 | 44-55 | 6 | 45,936 | Ken Hill | Bob Ojeda | Ken Hill | Bob Ojeda | Lee Smith | 371 | 425 | -54 |
| 1990-07-27 | @ NYN | 100 | L 1-10 | 44-56 | 6 | 43,184 | Bryn Smith | Frank Viola | Frank Viola | Bryn Smith | | 372 | 435 | -63 |
| 1990-07-28 | @ NYN | 101 | W 1-0 | 45-56 | 6 | 45,870 | Joe Magrane | David Cone | Joe Magrane | David Cone | Lee Smith | 373 | 435 | -62 |
| 1990-07-29 | @ NYN | 102 | L 0-6 | 45-57 | 6 | 41,946 | Jose DeLeon | Dwight Gooden | Dwight Gooden | Jose DeLeon | | 373 | 441 | -68 |
| 1990-07-31 | @ PHI | 103 | W 4-2 | 46-57 | 6 | 25,463 | John Tudor | Ken Howell | John Tudor | Ken Howell | Lee Smith | 377 | 443 | -66 |
| 1990-08-01 | @ PHI | 104 | L 10-11 | 46-58 | 6 | 23,142 | Ken Hill | Terry Mulholland | Terry Mulholland | Ken Hill | Roger McDowell | 387 | 454 | -67 |
| 1990-08-02 | @ PHI | 105 | W 4-3 | 47-58 | 6 | 21,898 | Bob Tewksbury | Jose De Jesus | Bob Tewksbury | Jose De Jesus | Lee Smith | 391 | 457 | -66 |
| 1990-08-03 | vs NYN | 106 | L 4-5 | 47-59 | 6 | 38,087 | Jose DeLeon | David Cone | Julio Machado | Lee Smith | John Franco | 395 | 462 | -67 |
| 1990-08-04 | vs NYN | 107 | W 7-5 | 48-59 | 6 | 41,874 | Ken Hill | Dwight Gooden | Ken Hill | Dwight Gooden | Frank DiPino | 402 | 467 | -65 |
| 1990-08-05 | vs NYN | 108 | W 8-3 | 49-59 | 6 | 35,997 | John Tudor | Sid Fernandez | John Tudor | Sid Fernandez | | 410 | 470 | -60 |
| 1990-08-06 | vs NYN | 109 | W 5-1 | 50-59 | 6 | 37,130 | Joe Magrane | Ron Darling | Joe Magrane | Ron Darling | Lee Smith | 415 | 471 | -56 |
| 1990-08-07 | @ CHN | 110 | L 3-5 | 50-60 | 6 | 34,271 | Bob Tewksbury | Mike Bielecki | Paul Assenmacher | Scott Terry | Mitch Williams | 418 | 476 | -58 |
| 1990-08-08 | @ CHN | 111 | L 3-4 | 50-61 | 6 | 34,977 | Jose DeLeon | Mike Harkey | Bill Long | Tom Niedenfuer | | 421 | 480 | -59 |
| 1990-08-09 | @ CHN | 112 | W 3-1 | 51-61 | 6 | 36,328 | Ken Hill | Lance Dickson | Ken Hill | Lance Dickson | Lee Smith | 424 | 481 | -57 |
| 1990-08-10 | @ PIT | 113 | W 8-3 | 52-61 | 6 | 23,701 | John Tudor | Randy Kramer | Ken Dayley | Randy Kramer | | 432 | 484 | -52 |
| 1990-08-11 | @ PIT | 114 | W 3-2 | 53-61 | 6 | 46,720 | Joe Magrane | Randy Tomlin | Joe Magrane | Randy Tomlin | Lee Smith | 435 | 486 | -51 |
| 1990-08-12 | @ PIT | 115 | W 6-0 | 54-61 | 5 | 30,335 | Bob Tewksbury | John Smiley | Bob Tewksbury | John Smiley | | 441 | 486 | -45 |
| 1990-08-14 | vs CIN | 116 | L 4-9 | 54-62 | 6 | 36,552 | Jose DeLeon | Jack Armstrong | Jack Armstrong | Jose DeLeon | Rick Mahler | 445 | 495 | -50 |
| 1990-08-15 | vs CIN | 117 | L 1-3 | 54-63 | 6 | 31,924 | Ken Hill | Norm Charlton | Rob Dibble | Tom Niedenfuer | Tim Layana | 446 | 498 | -52 |
| 1990-08-16 | vs HOU | 118 | L 2-4 | 54-64 | 6 | 23,756 | Joe Magrane | Danny Darwin | Danny Darwin | Joe Magrane | Dave Smith | 448 | 502 | -54 |
| 1990-08-17 | vs HOU | 119 | W 5-0 | 55-64 | 6 | 33,934 | Bob Tewksbury | Bill Gullickson | Bob Tewksbury | Bill Gullickson | | 453 | 502 | -49 |
| 1990-08-18 | vs HOU | 120 | L 2-3 | 55-65 | 6 | 40,609 | Omar Olivares | Mark Portugal | Dave Smith | Frank DiPino | | 455 | 505 | -50 |
| 1990-08-19 | vs HOU | 121 | W 7-3 | 56-65 | 6 | 32,165 | Jose DeLeon | Mike Scott | Jose DeLeon | Mike Scott | | 462 | 508 | -46 |
| 1990-08-20 | vs ATL | 122 | W 7-2 | 57-65 | 6 | 22,729 | Ken Hill | Tom Glavine | Ken Hill | Tom Glavine | | 469 | 510 | -41 |
| 1990-08-21 | vs ATL | 123 | L 2-7 | 57-66 | 6 | 27,388 | Joe Magrane | John Smoltz | John Smoltz | Joe Magrane | | 471 | 517 | -46 |
| 1990-08-22 | vs ATL | 124 | L 1-2 | 57-67 | 6 | 29,464 | Bob Tewksbury | Tony Castillo | Tony Castillo | Bob Tewksbury | Kent Mercker | 472 | 519 | -47 |
| 1990-08-24 | @ HOU | 125 | W 3-2 | 58-67 | 6 | 16,459 | Omar Olivares | Mike Scott | Scott Terry | Dave Smith | Lee Smith | 475 | 521 | -46 |
| 1990-08-25 | @ HOU | 126 | L 4-6 | 58-68 | 6 | 22,410 | Jose DeLeon | Jim Deshaies | Jim Deshaies | Jose DeLeon | Juan Agosto | 479 | 527 | -48 |
| 1990-08-26 | @ HOU | 127 | L 2-4 | 58-69 | 6 | 17,216 | Ken Hill | Danny Darwin | Danny Darwin | Ken Hill | | 481 | 531 | -50 |
| 1990-08-28 | @ CIN | 128 | L 1-2 | 58-70 | 6 | 25,846 | Joe Magrane | Jose Rijo | Jose Rijo | Joe Magrane | Randy Myers | 482 | 533 | -51 |
| 1990-08-29 | @ CIN | 129 | W 9-1 | 59-70 | 6 | 26,193 | Bob Tewksbury | Tom Browning | Bob Tewksbury | Tom Browning | | 491 | 534 | -43 |
| 1990-08-30 | @ ATL | 130 | W 5-3 | 60-70 | 5 | 3,672 | Omar Olivares | Tom Glavine | Frank DiPino | Dwayne Henry | Tom Niedenfuer | 496 | 537 | -41 |
| 1990-08-31 | @ ATL | 131 | L 1-4 | 60-71 | 6 | 6,957 | Jose DeLeon | John Smoltz | John Smoltz | Jose DeLeon | Kent Mercker | 497 | 541 | -44 |
| 1990-09-01 | @ ATL | 132 | L 3-4 | 60-72 | 6 | 14,673 | Ken Hill | Paul Marak | Tony Castillo | Ken Hill | Kent Mercker | 500 | 545 | -45 |
| 1990-09-02 | @ ATL | 133 | L 0-5 | 60-73 | 6 | 10,070 | John Tudor | Charlie Leibrandt | Charlie Leibrandt | John Tudor | | 500 | 550 | -50 |
| 1990-09-03 | vs NYN | 134 | L 3-9 | 60-74 | 6 | 27,156 | Bob Tewksbury | Dwight Gooden | Dwight Gooden | Bob Tewksbury | | 503 | 559 | -56 |
| 1990-09-04 | vs NYN | 135 | W 1-0 | 61-74 | 6 | 19,873 | Joe Magrane | Sid Fernandez | Joe Magrane | Sid Fernandez | Lee Smith | 504 | 559 | -55 |
| 1990-09-05 | vs MON | 136 | L 2-6 | 61-75 | 6 | 19,808 | Jose DeLeon | Chris Nabholz | Chris Nabholz | Jose DeLeon | Tim Burke | 506 | 565 | -59 |
| 1990-09-06 | vs MON | 137 | W 4-2 | 62-75 | 6 | 10,897 | Ken Hill | Mark Gardner | Ken Dayley | Mark Gardner | Lee Smith | 510 | 567 | -57 |
| 1990-09-07 | @ CHN | 138 | W 4-3 | 63-75 | 6 | 23,353 | Bob Tewksbury | Greg Maddux | Bob Tewksbury | Greg Maddux | Lee Smith | 514 | 570 | -56 |
| 1990-09-08 | @ CHN | 139 | L 4-5 | 63-76 | 6 | 32,039 | Omar Olivares | Rick Sutcliffe | Dave Pavlas | Ken Dayley | Paul Assenmacher | 518 | 575 | -57 |
| 1990-09-09 | @ CHN | 140 | W 9-2 | 64-76 | 6 | 27,362 | Bryn Smith | Mike Bielecki | John Tudor | Mike Bielecki | | 527 | 577 | -50 |
| 1990-09-10 | @ NYN | 141 | L 1-10 | 64-77 | 6 | 26,577 | Jose DeLeon | Frank Viola | Frank Viola | Jose DeLeon | | 528 | 587 | -59 |
| 1990-09-11 | @ NYN | 142 | L 8-10 | 64-78 | 6 | 25,126 | Ken Hill | Julio Valera | John Franco | Lee Smith | | 536 | 597 | -61 |
| 1990-09-12 | @ MON | 143 | L 2-6 | 64-79 | 6 | 10,128 | Bob Tewksbury | Oil Can Boyd | Oil Can Boyd | Bob Tewksbury | | 538 | 603 | -65 |
| 1990-09-13 | @ MON | 144 | W 6-4 | 65-79 | 6 | 9,185 | Omar Olivares | Bill Sampen | Omar Olivares | Bill Sampen | Lee Smith | 544 | 607 | -63 |
| 1990-09-14 | vs CHN | 145 | W 4-2 | 66-79 | 6 | 34,473 | Bryn Smith | Mitch Williams | Bryn Smith | Mitch Williams | Mike Perez | 548 | 609 | -61 |
| 1990-09-15 | vs CHN | 146 | L 2-6 | 66-80 | 6 | 42,282 | Jose DeLeon | Randy Kramer | Les Lancaster | Jose DeLeon | | 550 | 615 | -65 |
| 1990-09-16 | vs CHN | 147 | L 4-8 | 66-81 | 6 | 39,402 | Ken Hill | Jose Nunez | Jose Nunez | Ken Hill | Mike Bielecki | 554 | 623 | -69 |
| 1990-09-18 | vs PHI | 148 | L 3-6 | 66-82 | 6 | 15,588 | Bob Tewksbury | Jason Grimsley | Jason Grimsley | Bob Tewksbury | Joe Boever | 557 | 629 | -72 |
| 1990-09-19 | vs PHI | 149 | L 4-8 | 66-83 | 6 | 15,828 | Joe Magrane | Pat Combs | Pat Combs | Joe Magrane | | 561 | 637 | -76 |
| 1990-09-20 | vs PHI | 150 | W 5-4 | 67-83 | 6 | 14,744 | Bryn Smith | Terry Mulholland | Mike Perez | Roger McDowell | | 566 | 641 | -75 |
| 1990-09-21 | @ PIT | 151 | L 0-1 | 67-84 | 6 | 29,048 | Jose DeLeon | Zane Smith | Zane Smith | Jose DeLeon | | 566 | 642 | -76 |
| 1990-09-22 | @ PIT | 152 | W 3-2 | 68-84 | 6 | 22,895 | Ken Hill | Randy Tomlin | Ken Hill | Randy Tomlin | Lee Smith | 569 | 644 | -75 |
| 1990-09-23 | @ PIT | 153 | L 2-7 | 68-85 | 6 | 30,635 | Bob Tewksbury | John Smiley | John Smiley | Bob Tewksbury | Vicente Palacios | 571 | 651 | -80 |
| 1990-09-25 | @ PHI | 154 | W 1-0 | 69-85 | 6 | 13,615 | Joe Magrane | Terry Mulholland | Joe Magrane | Terry Mulholland | Ken Dayley | 572 | 651 | -79 |
| 1990-09-26 | @ PHI | 155 | W 8-1 | 70-85 | 6 | 12,443 | Bryn Smith | Jose De Jesus | Bryn Smith | Jose De Jesus | | 580 | 652 | -72 |
| 1990-09-27 | @ PHI | 156 | L 3-4 | 70-86 | 6 | 9,119 | Jose DeLeon | Tommy Greene | Tommy Greene | Jose DeLeon | Joe Boever | 583 | 656 | -73 |
| 1990-09-28 | vs PIT | 157 | L 4-6 | 70-87 | 6 | 24,837 | Ken Hill | John Smiley | Bill Landrum | Ken Hill | Stan Belinda | 587 | 662 | -75 |
| 1990-09-29 | vs PIT | 158 | L 0-8 | 70-88 | 6 | 23,571 | Bob Tewksbury | Bob Walk | Bob Walk | Bob Tewksbury | | 587 | 670 | -83 |
| 1990-09-30 | vs PIT | 159 | L 0-2 | 70-89 | 6 | 32,672 | Joe Magrane | Doug Drabek | Doug Drabek | Joe Magrane | | 587 | 672 | -85 |
| 1990-10-01 | @ MON | 160 | L 9-15 | 70-90 | 6 | 4,120 | Bryn Smith | Howard Farmer | Tim Burke | Ken Dayley | | 596 | 687 | -91 |
| 1990-10-02 | @ MON | 161 | L 1-2 | 70-91 | 6 | 4,636 | Omar Olivares | Kevin Gross | Kevin Gross | Omar Olivares | Steve Frey | 597 | 689 | -92 |
| 1990-10-03 | @ MON | 162 | L 2-9 | 70-92 | 6 | 4,262 | Ken Hill | Scott Anderson | Bill Sampen | Ken Hill | | 599 | 698 | -99 |