| 1989-04-04 | @ CHN | 1 | L 4-5 | 0-1 | 4 | 33,361 | Floyd Youmans | Rick Sutcliffe | Rick Sutcliffe | Floyd Youmans | Mitch Williams | 4 | 5 | -1 |
| 1989-04-05 | @ CHN | 2 | W 12-4 | 1-1 | 4 | 18,674 | Ken Howell | Greg Maddux | Ken Howell | Greg Maddux | Mike Maddux | 16 | 9 | 7 |
| 1989-04-06 | @ CHN | 3 | W 8-3 | 2-1 | 2 | 6,364 | Steve Ontiveros | Paul Kilgus | Steve Ontiveros | Paul Kilgus | | 24 | 12 | 12 |
| 1989-04-08 | vs SLN | 4 | W 5-4 | 3-1 | 2 | 23,741 | Don Carman | Scott Terry | Jeff Parrett | John Costello | | 29 | 16 | 13 |
| 1989-04-09 | vs SLN | 5 | L 3-15 | 3-2 | 3 | 31,631 | Bruce Ruffin | Joe Magrane | Joe Magrane | Bruce Ruffin | | 32 | 31 | 1 |
| 1989-04-10 | vs MON | 6 | W 7-6 | 4-2 | 2 | 13,194 | Floyd Youmans | Randy Johnson | Steve Bedrosian | Gene Harris | | 39 | 37 | 2 |
| 1989-04-11 | vs MON | 7 | W 6-2 | 5-2 | 2 | 14,429 | Steve Ontiveros | Pascual Perez | Steve Ontiveros | Pascual Perez | | 45 | 39 | 6 |
| 1989-04-12 | vs MON | 8 | W 6-3 | 6-2 | 2 | 15,461 | Don Carman | Kevin Gross | Don Carman | Kevin Gross | Steve Bedrosian | 51 | 42 | 9 |
| 1989-04-14 | vs CHN | 9 | L 4-6 | 6-3 | 2 | 20,851 | Bruce Ruffin | Scott Sanderson | Scott Sanderson | Bruce Ruffin | Mitch Williams | 55 | 48 | 7 |
| 1989-04-16 | vs CHN | 10 | L 3-5 | 6-4 | 2 | 32,249 | Floyd Youmans | Rick Sutcliffe | Rick Sutcliffe | Floyd Youmans | Mitch Williams | 58 | 53 | 5 |
| 1989-04-17 | @ NYN | 11 | L 2-5 | 6-5 | 2 | 28,087 | Don Carman | Sid Fernandez | Sid Fernandez | Don Carman | Randy Myers | 60 | 58 | 2 |
| 1989-04-18 | @ NYN | 12 | W 7-1 | 7-5 | 2 | 26,300 | Larry McWilliams | Ron Darling | Larry McWilliams | Ron Darling | | 67 | 59 | 8 |
| 1989-04-19 | @ NYN | 13 | L 2-4 | 7-6 | 3 | 25,694 | Steve Ontiveros | David Cone | Randy Myers | Steve Bedrosian | | 69 | 63 | 6 |
| 1989-04-20 | @ PIT | 14 | W 9-4 | 8-6 | 2 | 6,977 | Ken Howell | Mike Dunne | Ken Howell | Mike Dunne | | 78 | 67 | 11 |
| 1989-04-21 | @ PIT | 15 | W 3-2 | 9-6 | 2 | 15,221 | Floyd Youmans | Doug Drabek | Floyd Youmans | Doug Drabek | Steve Bedrosian | 81 | 69 | 12 |
| 1989-04-22 | @ PIT | 16 | L 3-4 | 9-7 | 2 | 14,669 | Don Carman | Neal Heaton | Jeff Robinson | Don Carman | | 84 | 73 | 11 |
| 1989-04-23 | @ PIT | 17 | L 4-6 | 9-8 | 2 | 16,816 | Larry McWilliams | John Smiley | Logan Easley | Steve Bedrosian | | 88 | 79 | 9 |
| 1989-04-24 | @ HOU | 18 | W 8-4 | 10-8 | 1 | 9,088 | Marvin Freeman | Jim Clancy | Greg Harris | Bob Forsch | | 96 | 83 | 13 |
| 1989-04-25 | @ HOU | 19 | L 1-4 | 10-9 | 1 | 12,584 | Ken Howell | Mike Scott | Mike Scott | Ken Howell | | 97 | 87 | 10 |
| 1989-04-26 | @ HOU | 20 | L 5-6 | 10-10 | 2 | 11,195 | Floyd Youmans | Jim Deshaies | Danny Darwin | Jeff Parrett | Dave Smith | 102 | 93 | 9 |
| 1989-04-28 | vs CIN | 21 | L 0-3 | 10-11 | 5 | 23,052 | Don Carman | Jose Rijo | Jose Rijo | Don Carman | John Franco | 102 | 96 | 6 |
| 1989-04-29 | vs CIN | 22 | W 8-0 | 11-11 | 5 | 23,156 | Mike Maddux | Danny Jackson | Mike Maddux | Danny Jackson | | 110 | 96 | 14 |
| 1989-04-30 | vs CIN | 23 | L 3-5 | 11-12 | 5 | 43,605 | Ken Howell | Tom Browning | Rob Dibble | Larry McWilliams | John Franco | 113 | 101 | 12 |
| 1989-05-02 | vs HOU | 24 | L 4-12 | 11-13 | 5 | 15,832 | Floyd Youmans | Jim Deshaies | Jim Deshaies | Floyd Youmans | | 117 | 113 | 4 |
| 1989-05-03 | @ ATL | 25 | L 3-6 | 11-14 | 5 | 4,143 | Don Carman | John Smoltz | John Smoltz | Don Carman | | 120 | 119 | 1 |
| 1989-05-04 | @ ATL | 26 | L 0-3 | 11-15 | 5 | 2,047 | Mike Maddux | Tom Glavine | Tom Glavine | Mike Maddux | | 120 | 122 | -2 |
| 1989-05-05 | @ CIN | 27 | W 7-0 | 12-15 | 5 | 17,901 | Ken Howell | Tom Browning | Ken Howell | Tom Browning | | 127 | 122 | 5 |
| 1989-05-06 | @ CIN | 28 | L 4-7 | 12-16 | 5 | 21,541 | Larry McWilliams | Rick Mahler | Rick Mahler | Larry McWilliams | John Franco | 131 | 129 | 2 |
| 1989-05-07 | @ CIN | 29 | W 5-0 | 13-16 | 5 | 24,839 | Alex Madrid | Jack Armstrong | Alex Madrid | Jack Armstrong | | 136 | 129 | 7 |
| 1989-05-09 | vs ATL | 30 | L 2-7 | 13-17 | 5 | 11,544 | Don Carman | John Smoltz | John Smoltz | Don Carman | | 138 | 136 | 2 |
| 1989-05-11 | vs ATL | 31 | L 3-8 | 13-18 | 5 | 14,841 | Mike Maddux | Tom Glavine | Tom Glavine | Randy O'Neal | | 141 | 144 | -3 |
| 1989-05-12 | vs LAN | 32 | W 3-0 | 14-18 | 5 | 23,292 | Ken Howell | Tim Leary | Ken Howell | Tim Leary | Steve Bedrosian | 144 | 144 | 0 |
| 1989-05-13 | vs LAN | 33 | W 2-0 | 15-18 | 5 | 30,294 | Larry McWilliams | Tim Belcher | Larry McWilliams | Tim Belcher | | 146 | 144 | 2 |
| 1989-05-14 | vs LAN | 34 | L 0-9 | 15-19 | 5 | 29,092 | Alex Madrid | Orel Hershiser | Orel Hershiser | Alex Madrid | | 146 | 153 | -7 |
| 1989-05-15 | vs SFN | 35 | W 3-2 | 16-19 | 5 | 15,703 | Don Carman | Scott Garrelts | Steve Bedrosian | Craig Lefferts | | 149 | 155 | -6 |
| 1989-05-16 | vs SFN | 36 | L 5-13 | 16-20 | 5 | 14,074 | Mike Maddux | Atlee Hammaker | Atlee Hammaker | Mike Maddux | | 154 | 168 | -14 |
| 1989-05-17 | vs SFN | 37 | L 0-6 | 16-21 | 5 | 18,943 | Ken Howell | Rick Reuschel | Rick Reuschel | Ken Howell | | 154 | 174 | -20 |
| 1989-05-19 | vs SDN | 38 | L 2-8 | 16-22 | 5 | 28,224 | Larry McWilliams | Ed Whitson | Ed Whitson | Larry McWilliams | | 156 | 182 | -26 |
| 1989-05-20 | vs SDN | 39 | L 2-3 | 16-23 | 5 | 28,866 | Don Carman | Dennis Rasmussen | Dennis Rasmussen | Don Carman | Greg Harris | 158 | 185 | -27 |
| 1989-05-21 | vs SDN | 40 | W 3-1 | 17-23 | 5 | 38,346 | Bob Sebra | Walt Terrell | Bob Sebra | Walt Terrell | Steve Bedrosian | 161 | 186 | -25 |
| 1989-05-23 | @ LAN | 41 | W 4-1 | 18-23 | 5 | 32,199 | Ken Howell | Fernando Valenzuela | Ken Howell | Fernando Valenzuela | Steve Bedrosian | 165 | 187 | -22 |
| 1989-05-24 | @ LAN | 42 | L 2-4 | 18-24 | 5 | 37,089 | Larry McWilliams | Tim Leary | Tim Leary | Larry McWilliams | Jay Howell | 167 | 191 | -24 |
| 1989-05-25 | @ LAN | 43 | L 6-7 | 18-25 | 6 | 27,781 | Don Carman | Tim Belcher | Tim Belcher | Don Carman | Jay Howell | 173 | 198 | -25 |
| 1989-05-26 | @ SFN | 44 | L 1-6 | 18-26 | 6 | 12,787 | Bob Sebra | Scott Garrelts | Scott Garrelts | Bob Sebra | | 174 | 204 | -30 |
| 1989-05-27 | @ SFN | 45 | L 2-6 | 18-27 | 6 | 18,325 | Alex Madrid | Atlee Hammaker | Atlee Hammaker | Alex Madrid | Craig Lefferts | 176 | 210 | -34 |
| 1989-05-28 | @ SFN | 46 | L 5-8 | 18-28 | 6 | 51,498 | Ken Howell | Rick Reuschel | Rick Reuschel | Ken Howell | Mike LaCoss | 181 | 218 | -37 |
| 1989-05-29 | @ SDN | 47 | L 0-1 | 18-29 | 6 | 21,161 | Larry McWilliams | Bruce Hurst | Bruce Hurst | Larry McWilliams | Mark Davis | 181 | 219 | -38 |
| 1989-05-30 | @ SDN | 48 | L 3-9 | 18-30 | 6 | 11,710 | Don Carman | Ed Whitson | Ed Whitson | Don Carman | | 184 | 228 | -44 |
| 1989-05-31 | @ SDN | 49 | L 1-2 | 18-31 | 6 | 15,768 | Bob Sebra | Dennis Rasmussen | Greg Harris | Jeff Parrett | Mark Davis | 185 | 230 | -45 |
| 1989-06-02 | vs MON | 50 | L 1-2 | 18-32 | 6 | 20,560 | Ken Howell | Mark Langston | Steve Frey | Greg Harris | Joe Hesketh | 186 | 232 | -46 |
| 1989-06-03 | vs MON | 51 | L 5-7 | 18-33 | 6 | 35,269 | Larry McWilliams | Kevin Gross | Kevin Gross | Larry McWilliams | Tim Burke | 191 | 239 | -48 |
| 1989-06-04 | vs MON | 52 | L 4-7 | 18-34 | 6 | 30,926 | Floyd Youmans | Dennis Martinez | Dennis Martinez | Don Carman | Andy McGaffigan | 195 | 246 | -51 |
| 1989-06-05 | vs PIT | 53 | W 3-3 | 19-34 | 6 | 17,696 | Bruce Ruffin | Neal Heaton | | | | 198 | 249 | -51 |
| 1989-06-06 | vs PIT | 54 | W 9-4 | 20-34 | 6 | 16,783 | Bob Sebra | Brian Fisher | Bob Sebra | Brian Fisher | Jeff Parrett | 207 | 253 | -46 |
| 1989-06-07 | vs PIT | 55 | W 7-5 | 21-34 | 5 | 15,480 | Ken Howell | John Smiley | Jeff Parrett | Bob Kipper | Steve Bedrosian | 214 | 258 | -44 |
| 1989-06-08 | vs PIT | 56 | W 15-11 | 22-34 | 5 | 18,511 | Larry McWilliams | Bob Walk | Don Carman | Jeff Robinson | | 229 | 269 | -40 |
| 1989-06-09 | @ MON | 57 | L 0-5 | 22-35 | 5 | 15,791 | Floyd Youmans | Dennis Martinez | Dennis Martinez | Floyd Youmans | | 229 | 274 | -45 |
| 1989-06-10 | @ MON | 58 | L 1-9 | 22-36 | 6 | 23,981 | Bruce Ruffin | Bryn Smith | Bryn Smith | Bruce Ruffin | | 230 | 283 | -53 |
| 1989-06-11 | @ MON | 59 | L 2-7 | 22-37 | 6 | 34,365 | Bob Sebra | Pascual Perez | Pascual Perez | Bob Sebra | | 232 | 290 | -58 |
| 1989-06-13 | @ PIT | 60 | W 10-2 | 23-37 | 5 | 11,570 | Ken Howell | Morris Madden | Ken Howell | Morris Madden | | 242 | 292 | -50 |
| 1989-06-14 | @ PIT | 61 | L 4-6 | 23-38 | 6 | 7,407 | Steve Ontiveros | John Smiley | John Smiley | Don Carman | Bill Landrum | 246 | 298 | -52 |
| 1989-06-15 | @ PIT | 62 | L 3-5 | 23-39 | 6 | 15,428 | Floyd Youmans | Doug Drabek | Doug Drabek | Bob Sebra | Bill Landrum | 249 | 303 | -54 |
| 1989-06-16 | vs NYN | 63 | L 11-15 | 23-40 | 6 | 33,135 | Bruce Ruffin | David Cone | Randy Myers | Steve Bedrosian | | 260 | 318 | -58 |
| 1989-06-17 | vs NYN | 64 | L 0-1 | 23-41 | 6 | 46,570 | Larry McWilliams | Bob Ojeda | Bob Ojeda | Larry McWilliams | | 260 | 319 | -59 |
| 1989-06-18 | vs NYN | 65 | W 6-5 | 24-41 | 6 | 43,689 | Ken Howell | Ron Darling | Jeff Parrett | Randy Myers | | 266 | 324 | -58 |
| 1989-06-20 | vs SLN | 66 | L 4-6 | 24-43 | 6 | 0 | Terry Mulholland | Ken Hill | Ken Hill | Terry Mulholland | Ken Dayley | 270 | 330 | -60 |
| 1989-06-20 | vs SLN | 67 | L 3-5 | 24-43 | 6 | 27,285 | Steve Ontiveros | Ted Power | Frank DiPino | Steve Ontiveros | Todd Worrell | 273 | 335 | -62 |
| 1989-06-22 | vs SLN | 68 | W 11-2 | 25-43 | 6 | 26,006 | Dennis Cook | Jose DeLeon | Dennis Cook | Jose DeLeon | | 284 | 337 | -53 |
| 1989-06-23 | @ NYN | 69 | L 3-9 | 25-44 | 6 | 44,828 | Ken Howell | Bob Ojeda | Bob Ojeda | Ken Howell | Randy Myers | 287 | 346 | -59 |
| 1989-06-24 | @ NYN | 70 | L 2-4 | 25-45 | 6 | 48,323 | Floyd Youmans | Ron Darling | Ron Darling | Floyd Youmans | Randy Myers | 289 | 350 | -61 |
| 1989-06-25 | @ NYN | 71 | L 1-5 | 25-46 | 6 | 47,692 | Terry Mulholland | Sid Fernandez | Sid Fernandez | Terry Mulholland | | 290 | 355 | -65 |
| 1989-06-26 | @ SLN | 72 | W 5-4 | 26-46 | 6 | 32,723 | Bruce Ruffin | Ken Hill | Jeff Parrett | Todd Worrell | Roger McDowell | 295 | 359 | -64 |
| 1989-06-27 | @ SLN | 73 | W 4-2 | 27-46 | 6 | 30,482 | Dennis Cook | Jose DeLeon | Dennis Cook | Jose DeLeon | Roger McDowell | 299 | 361 | -62 |
| 1989-06-28 | @ SLN | 74 | L 1-2 | 27-47 | 6 | 37,018 | Ken Howell | Joe Magrane | Joe Magrane | Ken Howell | | 300 | 363 | -63 |
| 1989-06-30 | vs ATL | 75 | W 4-2 | 28-48 | 6 | 0 | Terry Mulholland | Zane Smith | Terry Mulholland | Zane Smith | Jeff Parrett | 304 | 365 | -61 |
| 1989-06-30 | vs ATL | 76 | L 1-3 | 28-48 | 6 | 25,586 | Larry McWilliams | Derek Lilliquist | Derek Lilliquist | Larry McWilliams | Joe Boever | 305 | 368 | -63 |
| 1989-07-01 | vs ATL | 77 | W 4-2 | 29-48 | 6 | 33,045 | Bruce Ruffin | Pete Smith | Bruce Ruffin | Pete Smith | Roger McDowell | 309 | 370 | -61 |
| 1989-07-02 | vs ATL | 78 | L 1-3 | 29-49 | 6 | 28,524 | Dennis Cook | John Smoltz | John Smoltz | Dennis Cook | | 310 | 373 | -63 |
| 1989-07-03 | vs CIN | 79 | W 2-1 | 30-49 | 6 | 56,498 | Ken Howell | Jose Rijo | Ken Howell | Jose Rijo | Roger McDowell | 312 | 374 | -62 |
| 1989-07-04 | vs CIN | 80 | L 1-2 | 30-50 | 6 | 14,636 | Terry Mulholland | Tom Browning | Tom Browning | Terry Mulholland | John Franco | 313 | 376 | -63 |
| 1989-07-05 | vs CIN | 81 | W 3-2 | 31-50 | 6 | 11,935 | Larry McWilliams | Rick Mahler | Roger McDowell | John Franco | | 316 | 378 | -62 |
| 1989-07-06 | @ ATL | 82 | W 4-0 | 32-50 | 6 | 6,544 | Bruce Ruffin | Pete Smith | Bruce Ruffin | Pete Smith | Jeff Parrett | 320 | 378 | -58 |
| 1989-07-07 | @ ATL | 83 | L 3-5 | 32-51 | 6 | 11,450 | Dennis Cook | John Smoltz | John Smoltz | Dennis Cook | Joe Boever | 323 | 383 | -60 |
| 1989-07-08 | @ ATL | 84 | L 3-4 | 32-52 | 6 | 21,337 | Ken Howell | Tom Glavine | Paul Assenmacher | Jeff Parrett | Joe Boever | 326 | 387 | -61 |
| 1989-07-09 | @ ATL | 85 | W 4-3 | 33-52 | 6 | 9,292 | Terry Mulholland | Marty Clary | Jeff Parrett | Joe Boever | | 330 | 390 | -60 |
| 1989-07-13 | vs HOU | 86 | W 11-4 | 34-53 | 6 | 0 | Bruce Ruffin | Bob Knepper | Bruce Ruffin | Bob Knepper | Greg Harris | 341 | 394 | -53 |
| 1989-07-13 | vs HOU | 87 | L 0-3 | 34-53 | 6 | 22,771 | Dennis Cook | Bob Forsch | Bob Forsch | Dennis Cook | Dave Smith | 341 | 397 | -56 |
| 1989-07-14 | vs HOU | 88 | W 4-2 | 35-53 | 6 | 32,300 | Terry Mulholland | Jim Clancy | Jeff Parrett | Larry Andersen | | 345 | 399 | -54 |
| 1989-07-15 | vs HOU | 89 | L 6-9 | 35-54 | 6 | 25,574 | Larry McWilliams | Mark Portugal | Mark Portugal | Larry McWilliams | | 351 | 408 | -57 |
| 1989-07-17 | @ CIN | 90 | W 4-1 | 36-54 | 6 | 24,167 | Ken Howell | Ron Robinson | Ken Howell | Ron Robinson | Roger McDowell | 355 | 409 | -54 |
| 1989-07-18 | @ CIN | 91 | W 6-5 | 37-54 | 6 | 19,970 | Bruce Ruffin | Danny Jackson | Todd Frohwirth | Danny Jackson | Roger McDowell | 361 | 414 | -53 |
| 1989-07-19 | @ CIN | 92 | W 9-4 | 38-54 | 6 | 17,739 | Dennis Cook | Tom Browning | Dennis Cook | Tom Browning | | 370 | 418 | -48 |
| 1989-07-21 | @ HOU | 93 | L 2-4 | 38-55 | 6 | 25,501 | Terry Mulholland | Mike Scott | Mike Scott | Terry Mulholland | Dave Smith | 372 | 422 | -50 |
| 1989-07-22 | @ HOU | 94 | L 0-1 | 38-57 | 6 | 0 | Ken Howell | Jim Deshaies | Jim Deshaies | Ken Howell | Dave Smith | 372 | 423 | -51 |
| 1989-07-22 | @ HOU | 95 | L 3-4 | 38-57 | 6 | 35,803 | Larry McWilliams | Mark Portugal | Danny Darwin | Larry McWilliams | | 375 | 427 | -52 |
| 1989-07-23 | @ HOU | 96 | L 2-3 | 38-58 | 6 | 20,222 | Bruce Ruffin | Bob Forsch | Bob Forsch | Bruce Ruffin | Larry Andersen | 377 | 430 | -53 |
| 1989-07-24 | @ MON | 97 | L 3-4 | 38-59 | 6 | 25,218 | Dennis Cook | Bryn Smith | Andy McGaffigan | Greg Harris | | 380 | 434 | -54 |
| 1989-07-25 | @ MON | 98 | L 0-2 | 38-60 | 6 | 30,103 | Don Carman | Mark Langston | Mark Langston | Don Carman | | 380 | 436 | -56 |
| 1989-07-26 | @ MON | 99 | W 4-3 | 39-60 | 6 | 24,377 | Terry Mulholland | Kevin Gross | Jeff Parrett | Zane Smith | Roger McDowell | 384 | 439 | -55 |
| 1989-07-28 | vs PIT | 100 | L 5-10 | 40-61 | 6 | 0 | Ken Howell | Randy Kramer | Neal Heaton | Ken Howell | | 389 | 449 | -60 |
| 1989-07-28 | vs PIT | 101 | W 6-1 | 40-61 | 6 | 35,569 | Larry McWilliams | Rick Reed | Greg Harris | Rick Reed | | 395 | 450 | -55 |
| 1989-07-29 | vs PIT | 102 | W 6-2 | 41-61 | 6 | 47,277 | Bruce Ruffin | Bob Walk | Jeff Parrett | Bob Walk | Roger McDowell | 401 | 452 | -51 |
| 1989-07-30 | vs PIT | 103 | W 8-6 | 42-61 | 6 | 31,341 | Dennis Cook | Doug Drabek | Dennis Cook | Bob Kipper | Roger McDowell | 409 | 458 | -49 |
| 1989-07-31 | vs CHN | 104 | L 2-10 | 43-62 | 6 | 0 | Terry Mulholland | Rick Sutcliffe | Rick Sutcliffe | Terry Mulholland | | 411 | 468 | -57 |
| 1989-07-31 | vs CHN | 105 | W 7-4 | 43-62 | 6 | 22,160 | Don Carman | Paul Kilgus | Don Carman | Paul Kilgus | Jeff Parrett | 418 | 472 | -54 |
| 1989-08-01 | vs CHN | 106 | L 1-4 | 43-63 | 6 | 23,614 | Larry McWilliams | Steve Wilson | Steve Wilson | Larry McWilliams | Mitch Williams | 419 | 476 | -57 |
| 1989-08-02 | vs CHN | 107 | W 6-0 | 44-63 | 6 | 21,688 | Ken Howell | Scott Sanderson | Ken Howell | Scott Sanderson | | 425 | 476 | -51 |
| 1989-08-03 | vs CHN | 108 | L 0-2 | 44-64 | 6 | 21,983 | Bruce Ruffin | Greg Maddux | Greg Maddux | Bruce Ruffin | Les Lancaster | 425 | 478 | -53 |
| 1989-08-04 | @ SLN | 109 | L 3-6 | 44-65 | 6 | 44,149 | Dennis Cook | Joe Magrane | Joe Magrane | Dennis Cook | Todd Worrell | 428 | 484 | -56 |
| 1989-08-05 | @ SLN | 110 | W 7-3 | 45-65 | 6 | 46,504 | Terry Mulholland | Jose DeLeon | Terry Mulholland | Jose DeLeon | Jeff Parrett | 435 | 487 | -52 |
| 1989-08-06 | @ SLN | 111 | L 4-5 | 45-66 | 6 | 38,736 | Don Carman | Scott Terry | Todd Worrell | Jeff Parrett | | 439 | 492 | -53 |
| 1989-08-07 | vs NYN | 112 | W 2-1 | 46-66 | 6 | 35,350 | Ken Howell | Frank Viola | Roger McDowell | Jeff Musselman | | 441 | 493 | -52 |
| 1989-08-08 | vs NYN | 113 | L 0-9 | 46-67 | 6 | 35,196 | Bruce Ruffin | David Cone | David Cone | Bruce Ruffin | | 441 | 502 | -61 |
| 1989-08-09 | vs NYN | 114 | L 0-6 | 46-68 | 6 | 43,462 | Dennis Cook | Bob Ojeda | Bob Ojeda | Dennis Cook | | 441 | 508 | -67 |
| 1989-08-10 | @ CHN | 115 | W 16-13 | 47-68 | 6 | 36,745 | Randy O'Neal | Jeff Pico | Jeff Parrett | Steve Wilson | | 457 | 521 | -64 |
| 1989-08-11 | @ CHN | 116 | L 2-9 | 47-69 | 6 | 36,440 | Don Carman | Greg Maddux | Greg Maddux | Don Carman | | 459 | 530 | -71 |
| 1989-08-12 | @ CHN | 117 | L 7-9 | 47-70 | 6 | 37,752 | Ken Howell | Mike Bielecki | Mike Bielecki | Ken Howell | Mitch Williams | 466 | 539 | -73 |
| 1989-08-13 | @ CHN | 118 | W 5-3 | 48-70 | 6 | 37,054 | Bruce Ruffin | Rick Sutcliffe | Jeff Parrett | Steve Wilson | | 471 | 542 | -71 |
| 1989-08-15 | vs LAN | 119 | W 7-6 | 49-70 | 6 | 25,169 | Dennis Cook | Ramon Martinez | Jeff Parrett | Ray Searage | | 478 | 548 | -70 |
| 1989-08-16 | vs LAN | 120 | W 6-2 | 50-70 | 6 | 25,703 | Don Carman | Tim Belcher | Don Carman | Tim Belcher | Roger McDowell | 484 | 550 | -66 |
| 1989-08-17 | vs LAN | 121 | L 4-10 | 50-71 | 6 | 25,779 | Ken Howell | Fernando Valenzuela | Fernando Valenzuela | Ken Howell | Alejandro Pena | 488 | 560 | -72 |
| 1989-08-18 | vs SFN | 122 | L 2-5 | 50-72 | 6 | 23,368 | Bruce Ruffin | Rick Reuschel | Rick Reuschel | Bruce Ruffin | Steve Bedrosian | 490 | 565 | -75 |
| 1989-08-19 | vs SFN | 123 | W 1-0 | 51-72 | 5 | 30,366 | Terry Mulholland | Kelly Downs | Terry Mulholland | Kelly Downs | | 491 | 565 | -74 |
| 1989-08-20 | vs SFN | 124 | L 2-5 | 51-73 | 6 | 36,530 | Dennis Cook | Scott Garrelts | Jeff Brantley | Roger McDowell | | 493 | 570 | -77 |
| 1989-08-21 | vs SDN | 125 | L 2-8 | 51-74 | 6 | 17,467 | Don Carman | Dennis Rasmussen | Dennis Rasmussen | Don Carman | | 495 | 578 | -83 |
| 1989-08-22 | vs SDN | 126 | W 4-2 | 52-74 | 6 | 21,419 | Ken Howell | Bruce Hurst | Ken Howell | Mark Grant | Roger McDowell | 499 | 580 | -81 |
| 1989-08-23 | vs SDN | 127 | L 3-7 | 52-75 | 6 | 20,455 | Bruce Ruffin | Andy Benes | Andy Benes | Bruce Ruffin | | 502 | 587 | -85 |
| 1989-08-25 | @ LAN | 128 | W 3-2 | 53-75 | 6 | 33,541 | Terry Mulholland | Ramon Martinez | Terry Mulholland | Ramon Martinez | Jeff Parrett | 505 | 589 | -84 |
| 1989-08-26 | @ LAN | 129 | L 0-4 | 53-76 | 6 | 42,000 | Dennis Cook | Tim Belcher | Tim Belcher | Dennis Cook | | 505 | 593 | -88 |
| 1989-08-27 | @ LAN | 130 | L 1-8 | 53-77 | 6 | 28,496 | Don Carman | Fernando Valenzuela | Fernando Valenzuela | Don Carman | | 506 | 601 | -95 |
| 1989-08-28 | @ SFN | 131 | W 9-1 | 54-77 | 6 | 15,614 | Ken Howell | Rick Reuschel | Ken Howell | Rick Reuschel | | 515 | 602 | -87 |
| 1989-08-29 | @ SFN | 132 | W 6-1 | 55-77 | 6 | 13,952 | Bruce Ruffin | Don Robinson | Bruce Ruffin | Don Robinson | Roger McDowell | 521 | 603 | -82 |
| 1989-08-30 | @ SFN | 133 | L 2-3 | 55-78 | 6 | 19,053 | Terry Mulholland | Kelly Downs | Kelly Downs | Terry Mulholland | Steve Bedrosian | 523 | 606 | -83 |
| 1989-08-31 | @ SDN | 134 | L 1-5 | 55-79 | 6 | 15,541 | Don Carman | Dennis Rasmussen | Dennis Rasmussen | Don Carman | Mark Grant | 524 | 611 | -87 |
| 1989-09-02 | @ SDN | 135 | L 2-3 | 55-80 | 6 | 23,161 | Ken Howell | Bruce Hurst | Bruce Hurst | Ken Howell | Mark Davis | 526 | 614 | -88 |
| 1989-09-03 | @ SDN | 136 | L 5-9 | 55-81 | 6 | 24,956 | Dennis Cook | Andy Benes | Andy Benes | Dennis Cook | Mark Davis | 531 | 623 | -92 |
| 1989-09-04 | vs PIT | 137 | L 5-7 | 55-82 | 6 | 13,317 | Terry Mulholland | Jeff Robinson | Bob Patterson | Mike Maddux | Bill Landrum | 536 | 630 | -94 |
| 1989-09-05 | vs PIT | 138 | W 3-2 | 56-82 | 6 | 12,484 | Pat Combs | Neal Heaton | Jeff Parrett | Bob Patterson | | 539 | 632 | -93 |
| 1989-09-06 | vs CHN | 139 | W 9-1 | 57-82 | 6 | 17,272 | Bruce Ruffin | Greg Maddux | Bruce Ruffin | Greg Maddux | | 548 | 633 | -85 |
| 1989-09-07 | vs CHN | 140 | L 2-6 | 57-83 | 6 | 13,058 | Ken Howell | Mike Bielecki | Mike Bielecki | Ken Howell | | 550 | 639 | -89 |
| 1989-09-08 | @ MON | 141 | W 4-3 | 58-83 | 6 | 18,151 | Jason Grimsley | Kevin Gross | Jason Grimsley | Kevin Gross | Roger McDowell | 554 | 642 | -88 |
| 1989-09-09 | @ MON | 142 | L 5-6 | 58-84 | 6 | 22,981 | Terry Mulholland | Dennis Martinez | Tim Burke | Jeff Parrett | | 559 | 648 | -89 |
| 1989-09-10 | @ MON | 143 | W 4-2 | 59-84 | 6 | 22,630 | Pat Combs | Pascual Perez | Pat Combs | Pascual Perez | Roger McDowell | 563 | 650 | -87 |
| 1989-09-11 | vs NYN | 144 | L 2-5 | 59-85 | 6 | 18,690 | Bruce Ruffin | Ron Darling | Ron Darling | Bruce Ruffin | Randy Myers | 565 | 655 | -90 |
| 1989-09-12 | vs NYN | 145 | W 2-1 | 60-85 | 6 | 22,953 | Ken Howell | Frank Viola | Roger McDowell | Don Aase | | 567 | 656 | -89 |
| 1989-09-13 | vs NYN | 146 | L 4-10 | 60-86 | 6 | 20,062 | Jason Grimsley | Bob Ojeda | Bob Ojeda | Jason Grimsley | | 571 | 666 | -95 |
| 1989-09-15 | vs SLN | 147 | W 2-0 | 61-87 | 6 | 0 | Pat Combs | Ken Hill | Pat Combs | Ken Hill | | 573 | 666 | -93 |
| 1989-09-15 | vs SLN | 148 | L 6-7 | 61-87 | 6 | 22,579 | Terry Mulholland | Scott Terry | John Costello | Roger McDowell | | 579 | 673 | -94 |
| 1989-09-17 | vs SLN | 149 | W 9-5 | 62-88 | 6 | 0 | Don Carman | Joe Magrane | Dennis Cook | Matt Kinzer | | 588 | 678 | -90 |
| 1989-09-17 | vs SLN | 150 | L 0-2 | 62-88 | 6 | 23,043 | Ken Howell | Cris Carpenter | Cris Carpenter | Ken Howell | John Costello | 588 | 680 | -92 |
| 1989-09-18 | @ PIT | 151 | L 2-6 | 62-89 | 6 | 7,665 | Jason Grimsley | Bob Walk | Bob Patterson | Jason Grimsley | Randy Kramer | 590 | 686 | -96 |
| 1989-09-19 | @ PIT | 152 | L 2-4 | 62-90 | 6 | 8,156 | Bruce Ruffin | Jeff Robinson | Jeff Robinson | Bruce Ruffin | Bill Landrum | 592 | 690 | -98 |
| 1989-09-20 | @ CHN | 153 | W 9-8 | 63-90 | 6 | 21,620 | Pat Combs | Rick Sutcliffe | Don Carman | Les Lancaster | Roger McDowell | 601 | 698 | -97 |
| 1989-09-21 | @ CHN | 154 | L 1-9 | 63-91 | 6 | 22,885 | Terry Mulholland | Greg Maddux | Greg Maddux | Terry Mulholland | | 602 | 707 | -105 |
| 1989-09-22 | @ SLN | 155 | L 1-2 | 63-92 | 6 | 45,685 | Ken Howell | Joe Magrane | John Costello | Roger McDowell | | 603 | 709 | -106 |
| 1989-09-23 | @ SLN | 156 | L 5-11 | 63-93 | 6 | 38,936 | Dennis Cook | Cris Carpenter | Frank DiPino | Dennis Cook | | 608 | 720 | -112 |
| 1989-09-24 | @ SLN | 157 | L 1-2 | 63-94 | 6 | 38,795 | Bruce Ruffin | Bob Tewksbury | Ted Power | Jeff Parrett | John Costello | 609 | 722 | -113 |
| 1989-09-25 | @ NYN | 158 | W 2-1 | 64-94 | 6 | 18,001 | Pat Combs | Bob Ojeda | Pat Combs | Bob Ojeda | Roger McDowell | 611 | 723 | -112 |
| 1989-09-26 | @ NYN | 159 | L 0-3 | 64-95 | 6 | 17,385 | Jason Grimsley | Sid Fernandez | Sid Fernandez | Jason Grimsley | | 611 | 726 | -115 |
| 1989-09-27 | @ NYN | 160 | W 5-3 | 65-95 | 6 | 18,666 | Ken Howell | Ron Darling | Ken Howell | Ron Darling | Roger McDowell | 616 | 729 | -113 |
| 1989-09-29 | vs MON | 161 | W 2-0 | 66-95 | 6 | 15,771 | Dennis Cook | Mark Langston | Dennis Cook | Mark Langston | | 618 | 729 | -111 |
| 1989-09-30 | vs MON | 162 | W 6-3 | 67-95 | 6 | 20,448 | Bruce Ruffin | Mark Gardner | Bruce Ruffin | Mark Gardner | Roger McDowell | 624 | 732 | -108 |
| 1989-10-01 | vs MON | 163 | W 5-3 | 68-95 | 6 | 25,213 | Pat Combs | Bryn Smith | Pat Combs | Bryn Smith | Roger McDowell | 629 | 735 | -106 |