| 1989-04-04 | @ MON | 1 | L 5-6 | 0-1 | 5 | 35,154 | Bob Walk | Dennis Martinez | Andy McGaffigan | Jeff Robinson | | 5 | 6 | -1 |
| 1989-04-05 | @ MON | 2 | W 3-0 | 1-1 | 5 | 9,137 | Doug Drabek | Randy Johnson | Doug Drabek | Randy Johnson | | 8 | 6 | 2 |
| 1989-04-06 | @ MON | 3 | L 2-3 | 1-2 | 6 | 8,722 | John Smiley | Pascual Perez | Tim Burke | John Smiley | Joe Hesketh | 10 | 9 | 1 |
| 1989-04-07 | @ CHN | 4 | L 5-6 | 1-3 | 6 | 6,195 | Mike Dunne | Scott Sanderson | Steve Wilson | Dorn Taylor | Mitch Williams | 15 | 15 | 0 |
| 1989-04-08 | @ CHN | 5 | L 3-5 | 1-4 | 6 | 19,374 | Neal Heaton | Mike Bielecki | Mike Bielecki | Neal Heaton | Calvin Schiraldi | 18 | 20 | -2 |
| 1989-04-09 | @ CHN | 6 | L 3-8 | 1-5 | 6 | 11,387 | Bob Walk | Rick Sutcliffe | Rick Sutcliffe | Bob Walk | | 21 | 28 | -7 |
| 1989-04-11 | vs NYN | 7 | W 4-3 | 2-5 | 6 | 42,910 | Doug Drabek | Bob Ojeda | Jeff Robinson | Randy Myers | | 25 | 31 | -6 |
| 1989-04-13 | vs NYN | 8 | W 4-2 | 3-5 | 4 | 19,105 | John Smiley | Ron Darling | John Smiley | Ron Darling | Jeff Robinson | 29 | 33 | -4 |
| 1989-04-14 | vs MON | 9 | L 6-7 | 3-6 | 5 | 15,052 | Bob Walk | Dennis Martinez | Joe Hesketh | Scott Medvin | Andy McGaffigan | 35 | 40 | -5 |
| 1989-04-15 | vs MON | 10 | W 6-4 | 4-6 | 4 | 9,658 | Mike Dunne | Randy Johnson | Mike Dunne | Randy Johnson | Jeff Robinson | 41 | 44 | -3 |
| 1989-04-16 | vs MON | 11 | L 4-5 | 4-7 | 5 | 18,107 | Doug Drabek | Pascual Perez | Joe Hesketh | Jeff Robinson | Tim Burke | 45 | 49 | -4 |
| 1989-04-17 | @ SLN | 12 | L 2-4 | 4-8 | 6 | 25,277 | Neal Heaton | Scott Terry | Scott Terry | Brian Fisher | Todd Worrell | 47 | 53 | -6 |
| 1989-04-18 | @ SLN | 13 | W 4-3 | 5-8 | 5 | 22,198 | John Smiley | Cris Carpenter | Morris Madden | Todd Worrell | Jeff Robinson | 51 | 56 | -5 |
| 1989-04-19 | @ SLN | 14 | W 7-5 | 6-8 | 4 | 29,132 | Bob Walk | Don Heinkel | Bob Walk | Don Heinkel | Jeff Robinson | 58 | 61 | -3 |
| 1989-04-20 | vs PHI | 15 | L 4-9 | 6-9 | 6 | 6,977 | Mike Dunne | Ken Howell | Ken Howell | Mike Dunne | | 62 | 70 | -8 |
| 1989-04-21 | vs PHI | 16 | L 2-3 | 6-10 | 6 | 15,221 | Doug Drabek | Floyd Youmans | Floyd Youmans | Doug Drabek | Steve Bedrosian | 64 | 73 | -9 |
| 1989-04-22 | vs PHI | 17 | W 4-3 | 7-10 | 6 | 14,669 | Neal Heaton | Don Carman | Jeff Robinson | Don Carman | | 68 | 76 | -8 |
| 1989-04-23 | vs PHI | 18 | W 6-4 | 8-10 | 6 | 16,816 | John Smiley | Larry McWilliams | Logan Easley | Steve Bedrosian | | 74 | 80 | -6 |
| 1989-04-25 | vs SDN | 19 | L 0-1 | 8-11 | 6 | 5,296 | Bob Walk | Eric Show | Eric Show | Bob Walk | Mark Davis | 74 | 81 | -7 |
| 1989-04-26 | vs SDN | 20 | L 1-3 | 8-12 | 6 | 14,126 | Doug Drabek | Bruce Hurst | Bruce Hurst | Doug Drabek | | 75 | 84 | -9 |
| 1989-04-27 | vs SDN | 21 | L 1-8 | 8-13 | 6 | 6,473 | Neal Heaton | Ed Whitson | Ed Whitson | Neal Heaton | | 76 | 92 | -16 |
| 1989-04-28 | vs SFN | 22 | W 1-0 | 9-13 | 6 | 12,913 | John Smiley | Rick Reuschel | John Smiley | Rick Reuschel | | 77 | 92 | -15 |
| 1989-04-29 | vs SFN | 23 | L 3-4 | 9-14 | 6 | 11,509 | Randy Kramer | Mike Krukow | Mike LaCoss | Jeff Robinson | | 80 | 96 | -16 |
| 1989-04-30 | vs SFN | 24 | W 11-1 | 10-14 | 6 | 20,940 | Bob Walk | Don Robinson | Bob Walk | Don Robinson | | 91 | 97 | -6 |
| 1989-05-01 | @ LAN | 25 | L 0-1 | 10-15 | 6 | 27,630 | Doug Drabek | Mike Morgan | Jay Howell | Doug Drabek | | 91 | 98 | -7 |
| 1989-05-02 | @ LAN | 26 | L 0-7 | 10-16 | 6 | 29,310 | Neal Heaton | Orel Hershiser | Orel Hershiser | Neal Heaton | | 91 | 105 | -14 |
| 1989-05-03 | @ SFN | 27 | W 5-3 | 11-16 | 6 | 8,536 | John Smiley | Don Robinson | John Smiley | Don Robinson | Logan Easley | 96 | 108 | -12 |
| 1989-05-04 | @ SFN | 28 | L 3-6 | 11-17 | 6 | 11,820 | Randy Kramer | Mike Krukow | Mike Krukow | Randy Kramer | Craig Lefferts | 99 | 114 | -15 |
| 1989-05-05 | @ SDN | 29 | W 4-2 | 12-17 | 6 | 53,970 | Bob Walk | Eric Show | Bob Walk | Eric Show | | 103 | 116 | -13 |
| 1989-05-06 | @ SDN | 30 | L 2-4 | 12-18 | 6 | 33,582 | Doug Drabek | Bruce Hurst | Bruce Hurst | Doug Drabek | Mark Davis | 105 | 120 | -15 |
| 1989-05-07 | @ SDN | 31 | L 1-3 | 12-19 | 6 | 33,144 | Neal Heaton | Ed Whitson | Ed Whitson | Neal Heaton | Mark Davis | 106 | 123 | -17 |
| 1989-05-12 | vs ATL | 32 | W 10-2 | 13-19 | 6 | 13,378 | John Smiley | Zane Smith | John Smiley | Zane Smith | | 116 | 125 | -9 |
| 1989-05-13 | vs ATL | 33 | W 8-3 | 14-19 | 6 | 15,828 | Bob Walk | Pete Smith | Bob Walk | Pete Smith | | 124 | 128 | -4 |
| 1989-05-14 | vs ATL | 34 | L 2-5 | 14-20 | 6 | 11,403 | Doug Drabek | John Smoltz | John Smoltz | Doug Drabek | Joe Boever | 126 | 133 | -7 |
| 1989-05-15 | @ CIN | 35 | L 5-6 | 14-21 | 6 | 16,030 | Neal Heaton | Tom Browning | Norm Charlton | Jeff Robinson | | 131 | 139 | -8 |
| 1989-05-16 | @ CIN | 36 | W 5-0 | 15-21 | 6 | 22,595 | Randy Kramer | Rick Mahler | Randy Kramer | Rick Mahler | | 136 | 139 | -3 |
| 1989-05-17 | @ CIN | 37 | L 4-5 | 15-22 | 6 | 23,553 | John Smiley | Jose Rijo | John Franco | Bill Landrum | | 140 | 144 | -4 |
| 1989-05-19 | @ HOU | 38 | L 0-3 | 15-23 | 6 | 21,413 | Bob Walk | Mike Scott | Mike Scott | Bob Walk | | 140 | 147 | -7 |
| 1989-05-20 | @ HOU | 39 | L 4-5 | 15-24 | 6 | 20,595 | Doug Drabek | Bob Forsch | Juan Agosto | Bob Kipper | | 144 | 152 | -8 |
| 1989-05-21 | @ HOU | 40 | W 17-5 | 16-24 | 6 | 18,942 | Neal Heaton | Jim Clancy | Neal Heaton | Jim Clancy | Brian Fisher | 161 | 157 | 4 |
| 1989-05-23 | @ ATL | 41 | W 5-2 | 17-24 | 6 | 6,137 | John Smiley | Zane Smith | John Smiley | Zane Smith | | 166 | 159 | 7 |
| 1989-05-24 | @ ATL | 42 | W 4-1 | 18-24 | 6 | 5,896 | Bob Walk | Derek Lilliquist | Bill Landrum | Jim Acker | | 170 | 160 | 10 |
| 1989-05-25 | @ ATL | 43 | W 7-3 | 19-24 | 5 | 5,517 | Doug Drabek | Pete Smith | Doug Drabek | Pete Smith | Bill Landrum | 177 | 163 | 14 |
| 1989-05-26 | vs HOU | 44 | L 2-4 | 19-25 | 5 | 26,637 | Neal Heaton | Jim Clancy | Jim Clancy | Neal Heaton | Dave Smith | 179 | 167 | 12 |
| 1989-05-27 | vs HOU | 45 | L 4-5 | 19-26 | 5 | 22,359 | Brian Fisher | Jim Deshaies | Dan Schatzeder | Jeff Robinson | Dave Smith | 183 | 172 | 11 |
| 1989-05-28 | vs HOU | 46 | L 2-9 | 19-27 | 5 | 25,776 | John Smiley | Mike Scott | Mike Scott | John Smiley | Juan Agosto | 185 | 181 | 4 |
| 1989-05-29 | vs CIN | 47 | W 12-3 | 20-27 | 5 | 18,602 | Bob Walk | Tom Browning | Bob Walk | Tom Browning | Bob Kipper | 197 | 184 | 13 |
| 1989-05-30 | vs CIN | 48 | W 2-0 | 21-27 | 5 | 14,952 | Doug Drabek | Rick Mahler | Doug Drabek | Rick Mahler | Randy Kramer | 199 | 184 | 15 |
| 1989-05-31 | vs CIN | 49 | L 3-4 | 21-28 | 5 | 22,932 | Neal Heaton | Jose Rijo | Jose Rijo | Neal Heaton | John Franco | 202 | 188 | 14 |
| 1989-06-02 | @ NYN | 50 | L 2-3 | 21-29 | 5 | 42,578 | John Smiley | Dwight Gooden | Rick Aguilera | Randy Kramer | | 204 | 191 | 13 |
| 1989-06-03 | @ NYN | 51 | L 3-9 | 21-30 | 5 | 47,835 | Bob Walk | Ron Darling | Ron Darling | Bob Walk | | 207 | 200 | 7 |
| 1989-06-04 | @ NYN | 52 | L 3-4 | 21-31 | 5 | 47,478 | Doug Drabek | Sid Fernandez | Don Aase | Bob Kipper | Randy Myers | 210 | 204 | 6 |
| 1989-06-05 | @ PHI | 53 | L 3-3 | 21-32 | 5 | 17,696 | Neal Heaton | Bruce Ruffin | | | | 213 | 207 | 6 |
| 1989-06-06 | @ PHI | 54 | L 4-9 | 21-33 | 5 | 16,783 | Brian Fisher | Bob Sebra | Bob Sebra | Brian Fisher | Jeff Parrett | 217 | 216 | 1 |
| 1989-06-07 | @ PHI | 55 | L 5-7 | 21-34 | 6 | 15,480 | John Smiley | Ken Howell | Jeff Parrett | Bob Kipper | Steve Bedrosian | 222 | 223 | -1 |
| 1989-06-08 | @ PHI | 56 | L 11-15 | 21-35 | 6 | 18,511 | Bob Walk | Larry McWilliams | Don Carman | Jeff Robinson | | 233 | 238 | -5 |
| 1989-06-09 | vs NYN | 57 | W 4-3 | 22-35 | 6 | 20,819 | Doug Drabek | Sid Fernandez | Bill Landrum | Roger McDowell | | 237 | 241 | -4 |
| 1989-06-10 | vs NYN | 58 | W 6-5 | 23-35 | 5 | 27,463 | Randy Kramer | David Cone | Bob Kipper | Randy Myers | | 243 | 246 | -3 |
| 1989-06-11 | vs NYN | 59 | L 1-6 | 23-36 | 5 | 37,716 | Brian Fisher | Bob Ojeda | Bob Ojeda | Brian Fisher | | 244 | 252 | -8 |
| 1989-06-13 | vs PHI | 60 | L 2-10 | 23-37 | 6 | 11,570 | Morris Madden | Ken Howell | Ken Howell | Morris Madden | | 246 | 262 | -16 |
| 1989-06-14 | vs PHI | 61 | W 6-4 | 24-37 | 5 | 7,407 | John Smiley | Steve Ontiveros | John Smiley | Don Carman | Bill Landrum | 252 | 266 | -14 |
| 1989-06-15 | vs PHI | 62 | W 5-3 | 25-37 | 5 | 15,428 | Doug Drabek | Floyd Youmans | Doug Drabek | Bob Sebra | Bill Landrum | 257 | 269 | -12 |
| 1989-06-16 | @ SLN | 63 | L 2-6 | 25-38 | 5 | 47,186 | Randy Kramer | Scott Terry | Scott Terry | Randy Kramer | Ken Dayley | 259 | 275 | -16 |
| 1989-06-17 | @ SLN | 64 | W 7-2 | 26-38 | 5 | 43,924 | Jeff Robinson | Jose DeLeon | Jeff Robinson | Jose DeLeon | Bob Kipper | 266 | 277 | -11 |
| 1989-06-18 | @ SLN | 65 | W 12-4 | 27-38 | 5 | 40,198 | Morris Madden | Joe Magrane | Morris Madden | Joe Magrane | Bill Landrum | 278 | 281 | -3 |
| 1989-06-20 | vs CHN | 66 | L 4-5 | 27-39 | 5 | 11,713 | John Smiley | Scott Sanderson | Calvin Schiraldi | Miguel Garcia | Paul Kilgus | 282 | 286 | -4 |
| 1989-06-21 | vs CHN | 67 | L 0-1 | 27-40 | 5 | 23,970 | Doug Drabek | Greg Maddux | Greg Maddux | Doug Bair | Mitch Williams | 282 | 287 | -5 |
| 1989-06-22 | vs CHN | 68 | L 0-8 | 27-41 | 5 | 16,430 | Randy Kramer | Rick Sutcliffe | Rick Sutcliffe | Randy Kramer | | 282 | 295 | -13 |
| 1989-06-23 | vs SLN | 69 | L 2-3 | 27-42 | 5 | 22,904 | Morris Madden | Joe Magrane | Joe Magrane | Morris Madden | Todd Worrell | 284 | 298 | -14 |
| 1989-06-24 | vs SLN | 70 | W 5-2 | 28-42 | 5 | 36,064 | Bob Walk | Scott Terry | Bob Walk | Scott Terry | Bill Landrum | 289 | 300 | -11 |
| 1989-06-25 | vs SLN | 71 | W 5-3 | 29-42 | 5 | 22,514 | John Smiley | Ted Power | John Smiley | Ted Power | Bill Landrum | 294 | 303 | -9 |
| 1989-06-26 | @ CHN | 72 | W 2-1 | 30-42 | 5 | 35,407 | Doug Drabek | Greg Maddux | Doug Drabek | Greg Maddux | | 296 | 304 | -8 |
| 1989-06-27 | @ CHN | 73 | W 5-4 | 31-42 | 5 | 35,646 | Randy Kramer | Rick Sutcliffe | Randy Kramer | Rick Sutcliffe | Bill Landrum | 301 | 308 | -7 |
| 1989-06-28 | @ CHN | 74 | W 3-1 | 32-42 | 5 | 34,114 | Jeff Robinson | Mike Bielecki | Jeff Robinson | Mike Bielecki | Bill Landrum | 304 | 309 | -5 |
| 1989-06-30 | @ LAN | 75 | W 4-3 | 33-42 | 5 | 46,411 | Bob Walk | Orel Hershiser | Bob Walk | Orel Hershiser | Bill Landrum | 308 | 312 | -4 |
| 1989-07-01 | @ LAN | 76 | L 0-1 | 33-43 | 5 | 33,692 | John Smiley | Tim Leary | Tim Belcher | John Smiley | | 308 | 313 | -5 |
| 1989-07-02 | @ LAN | 77 | L 2-3 | 33-44 | 5 | 40,789 | Doug Drabek | John Tudor | John Wetteland | Doug Drabek | Jay Howell | 310 | 316 | -6 |
| 1989-07-03 | @ LAN | 78 | W 4-2 | 34-44 | 5 | 29,673 | Jeff Robinson | Mike Morgan | Jeff Robinson | Mike Morgan | Bill Landrum | 314 | 318 | -4 |
| 1989-07-04 | vs SFN | 79 | W 5-3 | 35-44 | 5 | 14,186 | Randy Kramer | Don Robinson | Randy Kramer | Don Robinson | Bill Landrum | 319 | 321 | -2 |
| 1989-07-05 | vs SFN | 80 | L 4-6 | 35-45 | 5 | 22,242 | Bob Walk | Trevor Wilson | Trevor Wilson | Bob Walk | | 323 | 327 | -4 |
| 1989-07-06 | vs SFN | 81 | L 1-2 | 35-46 | 5 | 18,165 | John Smiley | Rick Reuschel | Jeff Brantley | John Smiley | Craig Lefferts | 324 | 329 | -5 |
| 1989-07-07 | vs SDN | 82 | W 3-0 | 36-46 | 5 | 18,907 | Doug Drabek | Bruce Hurst | Doug Drabek | Bruce Hurst | | 327 | 329 | -2 |
| 1989-07-08 | vs SDN | 83 | L 0-2 | 36-47 | 5 | 25,852 | Jeff Robinson | Ed Whitson | Ed Whitson | Jeff Robinson | | 327 | 331 | -4 |
| 1989-07-09 | vs SDN | 84 | L 3-5 | 36-48 | 5 | 23,584 | Randy Kramer | Dennis Rasmussen | Mark Grant | Randy Kramer | Mark Davis | 330 | 336 | -6 |
| 1989-07-13 | @ SFN | 85 | L 2-3 | 36-49 | 5 | 17,178 | Bob Walk | Don Robinson | Jeff Brantley | Miguel Garcia | | 332 | 339 | -7 |
| 1989-07-14 | @ SFN | 86 | W 7-4 | 37-49 | 5 | 18,238 | Doug Drabek | Rick Reuschel | Doug Drabek | Rick Reuschel | Bill Landrum | 339 | 343 | -4 |
| 1989-07-15 | @ SFN | 87 | L 3-8 | 37-50 | 5 | 27,881 | John Smiley | Mike LaCoss | Mike LaCoss | John Smiley | | 342 | 351 | -9 |
| 1989-07-16 | @ SFN | 88 | L 1-3 | 37-51 | 5 | 44,781 | Jeff Robinson | Scott Garrelts | Scott Garrelts | Jeff Robinson | Steve Bedrosian | 343 | 354 | -11 |
| 1989-07-17 | @ SDN | 89 | W 4-1 | 38-51 | 5 | 13,667 | Randy Kramer | Greg Harris | Randy Kramer | Greg Harris | Bill Landrum | 347 | 355 | -8 |
| 1989-07-18 | @ SDN | 90 | L 4-17 | 38-52 | 5 | 18,777 | Bob Walk | Bruce Hurst | Bruce Hurst | Bob Walk | | 351 | 372 | -21 |
| 1989-07-19 | @ SDN | 91 | L 1-9 | 38-53 | 5 | 16,412 | Doug Drabek | Ed Whitson | Ed Whitson | Doug Drabek | | 352 | 381 | -29 |
| 1989-07-21 | vs LAN | 92 | W 4-1 | 39-54 | 5 | 0 | John Smiley | Tim Belcher | John Smiley | Tim Belcher | | 356 | 382 | -26 |
| 1989-07-21 | vs LAN | 93 | L 3-7 | 39-54 | 5 | 27,996 | Neal Heaton | Fernando Valenzuela | Fernando Valenzuela | Neal Heaton | Jay Howell | 359 | 389 | -30 |
| 1989-07-22 | vs LAN | 94 | L 4-8 | 39-55 | 5 | 31,108 | Jeff Robinson | Ramon Martinez | Ramon Martinez | Jeff Robinson | | 363 | 397 | -34 |
| 1989-07-23 | vs LAN | 95 | L 3-4 | 40-56 | 5 | 0 | Randy Kramer | Orel Hershiser | Orel Hershiser | Randy Kramer | Jay Howell | 366 | 401 | -35 |
| 1989-07-23 | vs LAN | 96 | W 2-1 | 40-56 | 5 | 34,373 | Rick Reed | John Wetteland | Bob Kipper | Tim Crews | | 368 | 402 | -34 |
| 1989-07-24 | vs LAN | 97 | W 7-4 | 41-56 | 5 | 19,957 | Bob Walk | Mike Morgan | Bob Walk | Mike Morgan | | 375 | 406 | -31 |
| 1989-07-25 | @ NYN | 98 | W 4-2 | 42-56 | 5 | 38,249 | Doug Drabek | Bob Ojeda | Doug Drabek | Rick Aguilera | Bill Landrum | 379 | 408 | -29 |
| 1989-07-26 | @ NYN | 99 | W 3-2 | 43-56 | 5 | 38,134 | John Smiley | Ron Darling | John Smiley | Ron Darling | | 382 | 410 | -28 |
| 1989-07-27 | @ NYN | 100 | W 10-8 | 44-56 | 5 | 39,447 | Jeff Robinson | Sid Fernandez | Bob Kipper | Don Aase | Bill Landrum | 392 | 418 | -26 |
| 1989-07-28 | @ PHI | 101 | W 10-5 | 45-57 | 5 | 0 | Randy Kramer | Ken Howell | Neal Heaton | Ken Howell | | 402 | 423 | -21 |
| 1989-07-28 | @ PHI | 102 | L 1-6 | 45-57 | 5 | 35,569 | Rick Reed | Larry McWilliams | Greg Harris | Rick Reed | | 403 | 429 | -26 |
| 1989-07-29 | @ PHI | 103 | L 2-6 | 45-58 | 5 | 47,277 | Bob Walk | Bruce Ruffin | Jeff Parrett | Bob Walk | Roger McDowell | 405 | 435 | -30 |
| 1989-07-30 | @ PHI | 104 | L 6-8 | 45-59 | 5 | 31,341 | Doug Drabek | Dennis Cook | Dennis Cook | Bob Kipper | Roger McDowell | 411 | 443 | -32 |
| 1989-07-31 | vs MON | 105 | L 2-4 | 45-60 | 5 | 13,150 | John Smiley | Mark Langston | Mark Langston | John Smiley | Tim Burke | 413 | 447 | -34 |
| 1989-08-01 | vs MON | 106 | L 4-5 | 45-61 | 5 | 14,912 | Jeff Robinson | Kevin Gross | Tim Burke | Doug Bair | | 417 | 452 | -35 |
| 1989-08-02 | vs MON | 107 | L 1-3 | 45-62 | 5 | 27,645 | Rick Reed | Pascual Perez | Pascual Perez | Rick Reed | Tim Burke | 418 | 455 | -37 |
| 1989-08-03 | vs MON | 108 | W 1-0 | 46-62 | 5 | 12,292 | Bob Walk | Dennis Martinez | Doug Bair | Andy McGaffigan | | 419 | 455 | -36 |
| 1989-08-04 | vs CHN | 109 | L 2-3 | 46-63 | 5 | 29,169 | Doug Drabek | Mike Bielecki | Mike Bielecki | Doug Drabek | Mitch Williams | 421 | 458 | -37 |
| 1989-08-05 | vs CHN | 110 | L 2-4 | 46-64 | 5 | 23,262 | John Smiley | Rick Sutcliffe | Steve Wilson | Bill Landrum | Les Lancaster | 423 | 462 | -39 |
| 1989-08-06 | vs CHN | 111 | W 5-4 | 47-64 | 5 | 24,716 | Jeff Robinson | Jeff Pico | Doug Drabek | Scott Sanderson | | 428 | 466 | -38 |
| 1989-08-07 | vs SLN | 112 | L 0-4 | 47-65 | 5 | 11,772 | Rick Reed | Ted Power | Ted Power | Rick Reed | | 428 | 470 | -42 |
| 1989-08-08 | vs SLN | 113 | W 7-3 | 48-65 | 5 | 13,884 | Bob Walk | Ken Hill | Bob Walk | Ken Hill | | 435 | 473 | -38 |
| 1989-08-09 | vs SLN | 114 | L 2-5 | 48-66 | 5 | 15,046 | Doug Drabek | Joe Magrane | Joe Magrane | Doug Drabek | | 437 | 478 | -41 |
| 1989-08-11 | @ MON | 115 | L 1-4 | 48-67 | 5 | 30,123 | John Smiley | Mark Langston | Mark Langston | John Smiley | | 438 | 482 | -44 |
| 1989-08-12 | @ MON | 116 | L 2-5 | 48-68 | 5 | 27,697 | Jeff Robinson | Kevin Gross | Kevin Gross | Jeff Robinson | Zane Smith | 440 | 487 | -47 |
| 1989-08-13 | @ MON | 117 | W 6-4 | 49-68 | 5 | 38,576 | Bob Walk | Pascual Perez | Bob Walk | Pascual Perez | Bill Landrum | 446 | 491 | -45 |
| 1989-08-14 | @ MON | 118 | W 6-1 | 50-68 | 5 | 18,838 | Doug Drabek | Dennis Martinez | Doug Drabek | Dennis Martinez | | 452 | 492 | -40 |
| 1989-08-15 | @ HOU | 119 | L 2-3 | 50-69 | 5 | 23,574 | Rick Reed | Mike Scott | Larry Andersen | Mike Smith | | 454 | 495 | -41 |
| 1989-08-16 | @ HOU | 120 | W 5-4 | 51-69 | 5 | 17,317 | John Smiley | Rick Rhoden | Neal Heaton | Larry Andersen | Bill Landrum | 459 | 499 | -40 |
| 1989-08-17 | @ HOU | 121 | L 3-5 | 51-70 | 5 | 25,325 | Jeff Robinson | Jim Deshaies | Jim Deshaies | Jeff Robinson | | 462 | 504 | -42 |
| 1989-08-18 | @ ATL | 122 | L 6-13 | 51-71 | 5 | 17,154 | Bob Walk | Tom Glavine | Tom Glavine | Bob Walk | | 468 | 517 | -49 |
| 1989-08-19 | @ ATL | 123 | L 3-4 | 51-72 | 6 | 27,034 | Doug Drabek | John Smoltz | John Smoltz | Doug Drabek | Joe Boever | 471 | 521 | -50 |
| 1989-08-20 | @ ATL | 124 | W 7-6 | 52-72 | 5 | 9,222 | Rick Reed | Pete Smith | Rick Reed | Pete Smith | Bill Landrum | 478 | 527 | -49 |
| 1989-08-22 | vs HOU | 125 | W 4-1 | 53-72 | 5 | 14,638 | John Smiley | Jim Deshaies | John Smiley | Jim Deshaies | | 482 | 528 | -46 |
| 1989-08-23 | vs HOU | 126 | W 6-1 | 54-72 | 5 | 12,564 | Bob Walk | Jim Clancy | Bob Walk | Jim Clancy | | 488 | 529 | -41 |
| 1989-08-24 | vs HOU | 127 | W 3-2 | 55-72 | 5 | 13,884 | Doug Drabek | Mark Portugal | Doug Bair | Juan Agosto | | 491 | 531 | -40 |
| 1989-08-25 | @ CIN | 128 | W 12-3 | 56-72 | 5 | 25,722 | Jeff Robinson | Rick Mahler | Jeff Robinson | Rick Mahler | | 503 | 534 | -31 |
| 1989-08-26 | @ CIN | 129 | L 4-6 | 56-73 | 5 | 26,159 | Rick Reed | Ron Robinson | Ron Robinson | Rick Reed | John Franco | 507 | 540 | -33 |
| 1989-08-27 | @ CIN | 130 | L 0-1 | 56-74 | 5 | 22,413 | Randy Kramer | Tom Browning | Tom Browning | Randy Kramer | John Franco | 507 | 541 | -34 |
| 1989-08-28 | vs ATL | 131 | L 2-5 | 56-75 | 5 | 9,854 | Bob Walk | Pete Smith | Pete Smith | Bob Walk | Mike Stanton | 509 | 546 | -37 |
| 1989-08-29 | vs ATL | 132 | W 5-4 | 57-75 | 5 | 9,686 | Doug Drabek | Tom Glavine | Doug Drabek | Tom Glavine | Bill Landrum | 514 | 550 | -36 |
| 1989-08-30 | vs ATL | 133 | W 7-5 | 58-75 | 5 | 8,314 | Jeff Robinson | John Smoltz | Randy Kramer | Joe Boever | Bill Landrum | 521 | 555 | -34 |
| 1989-09-01 | vs CIN | 134 | L 5-11 | 58-76 | 5 | 15,623 | Bob Patterson | Ron Robinson | Ron Robinson | Bob Patterson | | 526 | 566 | -40 |
| 1989-09-02 | vs CIN | 135 | L 2-6 | 58-77 | 5 | 25,682 | Bob Walk | Tom Browning | Tom Browning | Bob Walk | | 528 | 572 | -44 |
| 1989-09-03 | vs CIN | 136 | W 3-1 | 59-77 | 5 | 24,175 | Doug Drabek | Scott Scudder | Doug Drabek | Scott Scudder | Bill Landrum | 531 | 573 | -42 |
| 1989-09-04 | @ PHI | 137 | W 7-5 | 60-77 | 5 | 13,317 | Jeff Robinson | Terry Mulholland | Bob Patterson | Mike Maddux | Bill Landrum | 538 | 578 | -40 |
| 1989-09-05 | @ PHI | 138 | L 2-3 | 60-78 | 5 | 12,484 | Neal Heaton | Pat Combs | Jeff Parrett | Bob Patterson | | 540 | 581 | -41 |
| 1989-09-06 | @ MON | 139 | L 6-11 | 60-79 | 5 | 17,330 | Randy Kramer | Mark Langston | Mark Langston | Randy Kramer | | 546 | 592 | -46 |
| 1989-09-07 | @ MON | 140 | W 7-4 | 61-79 | 5 | 16,390 | Bob Walk | Bryn Smith | Bob Walk | John Candelaria | Bill Landrum | 553 | 596 | -43 |
| 1989-09-08 | @ NYN | 141 | L 2-7 | 61-80 | 5 | 36,902 | Doug Drabek | Bob Ojeda | Bob Ojeda | Doug Drabek | | 555 | 603 | -48 |
| 1989-09-09 | @ NYN | 142 | W 8-5 | 62-80 | 5 | 41,722 | Jeff Robinson | David Cone | Dorn Taylor | Jeff Innis | Bob Patterson | 563 | 608 | -45 |
| 1989-09-10 | @ NYN | 143 | W 4-1 | 63-80 | 5 | 45,024 | John Smiley | Sid Fernandez | John Smiley | Sid Fernandez | Bob Kipper | 567 | 609 | -42 |
| 1989-09-11 | @ SLN | 144 | W 3-1 | 64-80 | 5 | 25,642 | Neal Heaton | Ricky Horton | Neal Heaton | Ricky Horton | Doug Bair | 570 | 610 | -40 |
| 1989-09-12 | @ SLN | 145 | W 5-2 | 65-80 | 5 | 25,370 | Bob Walk | Joe Magrane | Bob Walk | Joe Magrane | | 575 | 612 | -37 |
| 1989-09-13 | @ SLN | 146 | L 0-0 | 65-81 | 5 | 28,561 | Doug Drabek | Jose DeLeon | | | | 575 | 612 | -37 |
| 1989-09-14 | @ SLN | 147 | W 4-3 | 66-81 | 5 | 1,519 | Jeff Robinson | Bob Tewksbury | Bob Patterson | Ken Dayley | Bob Kipper | 579 | 615 | -36 |
| 1989-09-15 | vs CHN | 148 | L 2-7 | 66-82 | 5 | 12,607 | Neal Heaton | Rick Sutcliffe | Rick Sutcliffe | Stan Belinda | | 581 | 622 | -41 |
| 1989-09-16 | vs CHN | 149 | W 8-6 | 67-82 | 5 | 15,668 | John Smiley | Greg Maddux | John Smiley | Greg Maddux | | 589 | 628 | -39 |
| 1989-09-17 | vs CHN | 150 | W 2-0 | 68-82 | 5 | 21,081 | Doug Drabek | Mike Bielecki | Doug Drabek | Mike Bielecki | | 591 | 628 | -37 |
| 1989-09-18 | vs PHI | 151 | W 6-2 | 69-82 | 5 | 7,665 | Bob Walk | Jason Grimsley | Bob Patterson | Jason Grimsley | Randy Kramer | 597 | 630 | -33 |
| 1989-09-19 | vs PHI | 152 | W 4-2 | 70-82 | 5 | 8,156 | Jeff Robinson | Bruce Ruffin | Jeff Robinson | Bruce Ruffin | Bill Landrum | 601 | 632 | -31 |
| 1989-09-20 | vs MON | 153 | W 9-1 | 71-82 | 5 | 11,926 | Neal Heaton | Kevin Gross | Neal Heaton | Kevin Gross | | 610 | 633 | -23 |
| 1989-09-21 | vs MON | 154 | L 5-6 | 71-83 | 5 | 6,753 | John Smiley | Dennis Martinez | Dennis Martinez | John Smiley | Tim Burke | 615 | 639 | -24 |
| 1989-09-22 | @ CHN | 155 | L 2-4 | 71-84 | 5 | 34,040 | Doug Drabek | Mike Bielecki | Mike Bielecki | Doug Drabek | Mitch Williams | 617 | 643 | -26 |
| 1989-09-23 | @ CHN | 156 | L 2-3 | 71-85 | 5 | 36,849 | Bob Walk | Paul Kilgus | Les Lancaster | Doug Bair | | 619 | 646 | -27 |
| 1989-09-24 | @ CHN | 157 | L 2-4 | 71-86 | 5 | 37,904 | Jeff Robinson | Steve Wilson | Steve Wilson | Jeff Robinson | Jeff Pico | 621 | 650 | -29 |
| 1989-09-25 | vs SLN | 158 | W 4-2 | 72-86 | 5 | 4,278 | Neal Heaton | Jose DeLeon | Neal Heaton | Jose DeLeon | Bill Landrum | 625 | 652 | -27 |
| 1989-09-26 | vs SLN | 159 | W 4-1 | 73-86 | 5 | 8,101 | Bob Patterson | Ken Hill | Bob Patterson | Ken Hill | Bill Landrum | 629 | 653 | -24 |
| 1989-09-27 | vs SLN | 160 | W 1-0 | 74-86 | 5 | 5,051 | Doug Drabek | Joe Magrane | Doug Drabek | Joe Magrane | | 630 | 653 | -23 |
| 1989-09-29 | vs NYN | 161 | L 2-6 | 74-88 | 5 | 0 | Randy Kramer | Frank Viola | Frank Viola | Randy Kramer | | 632 | 659 | -27 |
| 1989-09-29 | vs NYN | 162 | L 0-7 | 74-88 | 5 | 16,734 | Jeff Robinson | David Cone | David Cone | Jeff Robinson | | 632 | 666 | -34 |
| 1989-09-30 | vs NYN | 163 | L 2-7 | 74-89 | 5 | 20,624 | Neal Heaton | Blaine Beatty | Randy Myers | Bill Landrum | | 634 | 673 | -39 |
| 1989-10-01 | vs NYN | 164 | L 3-7 | 74-90 | 5 | 23,502 | Bob Patterson | Sid Fernandez | Sid Fernandez | Bob Patterson | | 637 | 680 | -43 |