| 1989-04-04 | vs PHI | 1 | W 5-4 | 1-0 | 1 | 33,361 | Rick Sutcliffe | Floyd Youmans | Rick Sutcliffe | Floyd Youmans | Mitch Williams | 5 | 4 | 1 |
| 1989-04-05 | vs PHI | 2 | L 4-12 | 1-1 | 1 | 18,674 | Greg Maddux | Ken Howell | Ken Howell | Greg Maddux | Mike Maddux | 9 | 16 | -7 |
| 1989-04-06 | vs PHI | 3 | L 3-8 | 1-2 | 5 | 6,364 | Paul Kilgus | Steve Ontiveros | Steve Ontiveros | Paul Kilgus | | 12 | 24 | -12 |
| 1989-04-07 | vs PIT | 4 | W 6-5 | 2-2 | 3 | 6,195 | Scott Sanderson | Mike Dunne | Steve Wilson | Dorn Taylor | Mitch Williams | 18 | 29 | -11 |
| 1989-04-08 | vs PIT | 5 | W 5-3 | 3-2 | 3 | 19,374 | Mike Bielecki | Neal Heaton | Mike Bielecki | Neal Heaton | Calvin Schiraldi | 23 | 32 | -9 |
| 1989-04-09 | vs PIT | 6 | W 8-3 | 4-2 | 1 | 11,387 | Rick Sutcliffe | Bob Walk | Rick Sutcliffe | Bob Walk | | 31 | 35 | -4 |
| 1989-04-11 | vs SLN | 7 | W 5-4 | 5-2 | 1 | 7,943 | Greg Maddux | Jose DeLeon | Calvin Schiraldi | Jose DeLeon | Mitch Williams | 36 | 39 | -3 |
| 1989-04-12 | vs SLN | 8 | W 3-2 | 6-2 | 1 | 21,187 | Paul Kilgus | Scott Terry | Paul Kilgus | Scott Terry | Mitch Williams | 39 | 41 | -2 |
| 1989-04-14 | @ PHI | 9 | W 6-4 | 7-2 | 1 | 20,851 | Scott Sanderson | Bruce Ruffin | Scott Sanderson | Bruce Ruffin | Mitch Williams | 45 | 45 | 0 |
| 1989-04-16 | @ PHI | 10 | W 5-3 | 8-2 | 1 | 32,249 | Rick Sutcliffe | Floyd Youmans | Rick Sutcliffe | Floyd Youmans | Mitch Williams | 50 | 48 | 2 |
| 1989-04-17 | @ MON | 11 | L 1-2 | 8-3 | 1 | 8,847 | Greg Maddux | Kevin Gross | Kevin Gross | Greg Maddux | Tim Burke | 51 | 50 | 1 |
| 1989-04-18 | @ MON | 12 | L 2-11 | 8-4 | 1 | 11,913 | Paul Kilgus | Bryn Smith | Bryn Smith | Paul Kilgus | | 53 | 61 | -8 |
| 1989-04-19 | @ MON | 13 | L 2-3 | 8-5 | 1 | 9,014 | Scott Sanderson | Dennis Martinez | Dennis Martinez | Scott Sanderson | Tim Burke | 55 | 64 | -9 |
| 1989-04-20 | @ NYN | 14 | L 3-4 | 8-6 | 1 | 28,944 | Mike Bielecki | Dwight Gooden | Dwight Gooden | Mitch Williams | Roger McDowell | 58 | 68 | -10 |
| 1989-04-21 | @ NYN | 15 | W 8-4 | 9-6 | 1 | 34,690 | Rick Sutcliffe | Bob Ojeda | Rick Sutcliffe | Bob Ojeda | Steve Wilson | 66 | 72 | -6 |
| 1989-04-22 | @ NYN | 16 | L 1-3 | 9-7 | 1 | 41,323 | Greg Maddux | Sid Fernandez | Sid Fernandez | Greg Maddux | Roger McDowell | 67 | 75 | -8 |
| 1989-04-23 | @ NYN | 17 | L 2-4 | 9-8 | 1 | 40,268 | Paul Kilgus | Ron Darling | Rick Aguilera | Calvin Schiraldi | | 69 | 79 | -10 |
| 1989-04-25 | vs LAN | 18 | L 0-4 | 9-9 | 2 | 31,876 | Scott Sanderson | Tim Belcher | Tim Belcher | Scott Sanderson | | 69 | 83 | -14 |
| 1989-04-26 | vs LAN | 19 | L 1-3 | 9-10 | 5 | 13,221 | Rick Sutcliffe | Mike Morgan | Mike Morgan | Rick Sutcliffe | Jay Howell | 70 | 86 | -16 |
| 1989-04-27 | vs LAN | 20 | W 1-0 | 10-10 | 3 | 12,013 | Greg Maddux | Orel Hershiser | Greg Maddux | Orel Hershiser | | 71 | 86 | -15 |
| 1989-04-28 | vs SDN | 21 | W 3-1 | 11-10 | 3 | 9,504 | Paul Kilgus | Dennis Rasmussen | Paul Kilgus | Dennis Rasmussen | Mitch Williams | 74 | 87 | -13 |
| 1989-04-29 | vs SDN | 22 | L 4-5 | 11-11 | 4 | 34,748 | Mike Bielecki | Walt Terrell | Walt Terrell | Mike Bielecki | Mark Davis | 78 | 92 | -14 |
| 1989-04-30 | vs SDN | 23 | W 7-3 | 12-11 | 4 | 28,735 | Scott Sanderson | Eric Show | Scott Sanderson | Eric Show | | 85 | 95 | -10 |
| 1989-05-01 | @ SFN | 24 | W 4-3 | 13-11 | 3 | 17,914 | Rick Sutcliffe | Kelly Downs | Jeff Pico | Mike LaCoss | Calvin Schiraldi | 89 | 98 | -9 |
| 1989-05-02 | @ SFN | 25 | L 0-4 | 13-12 | 4 | 11,128 | Greg Maddux | Rick Reuschel | Rick Reuschel | Greg Maddux | Rich Gossage | 89 | 102 | -13 |
| 1989-05-03 | @ SDN | 26 | W 5-4 | 14-12 | 4 | 20,403 | Paul Kilgus | Dennis Rasmussen | Paul Kilgus | Mark Grant | Mitch Williams | 94 | 106 | -12 |
| 1989-05-04 | @ SDN | 27 | W 4-0 | 15-12 | 3 | 25,892 | Mike Bielecki | Walt Terrell | Mike Bielecki | Walt Terrell | | 98 | 106 | -8 |
| 1989-05-05 | @ LAN | 28 | W 4-2 | 16-12 | 3 | 46,767 | Scott Sanderson | Tim Belcher | Scott Sanderson | Tim Belcher | Mitch Williams | 102 | 108 | -6 |
| 1989-05-06 | @ LAN | 29 | L 0-3 | 16-13 | 3 | 46,389 | Rick Sutcliffe | Mike Morgan | Mike Morgan | Rick Sutcliffe | Jay Howell | 102 | 111 | -9 |
| 1989-05-07 | @ LAN | 30 | W 4-2 | 17-13 | 2 | 46,329 | Greg Maddux | Orel Hershiser | Steve Wilson | Orel Hershiser | Mitch Williams | 106 | 113 | -7 |
| 1989-05-09 | vs SFN | 31 | L 2-4 | 17-14 | 3 | 13,949 | Paul Kilgus | Mike Krukow | Mike Krukow | Paul Kilgus | Craig Lefferts | 108 | 117 | -9 |
| 1989-05-10 | vs SFN | 32 | L 3-4 | 17-15 | 3 | 25,638 | Mike Bielecki | Scott Garrelts | Mike LaCoss | Mitch Williams | Craig Lefferts | 111 | 121 | -10 |
| 1989-05-12 | vs HOU | 33 | L 1-3 | 17-16 | 3 | 21,141 | Rick Sutcliffe | Jim Deshaies | Jim Deshaies | Rick Sutcliffe | | 112 | 124 | -12 |
| 1989-05-13 | vs HOU | 34 | L 0-1 | 17-17 | 4 | 27,775 | Greg Maddux | Bob Knepper | Bob Knepper | Greg Maddux | Dave Smith | 112 | 125 | -13 |
| 1989-05-14 | vs HOU | 35 | L 1-5 | 17-18 | 4 | 23,391 | Paul Kilgus | Mike Scott | Mike Scott | Paul Kilgus | | 113 | 130 | -17 |
| 1989-05-15 | vs ATL | 36 | W 4-0 | 18-18 | 4 | 16,920 | Mike Bielecki | Derek Lilliquist | Mike Bielecki | Derek Lilliquist | | 117 | 130 | -13 |
| 1989-05-16 | vs ATL | 37 | W 4-3 | 19-18 | 3 | 24,070 | Scott Sanderson | Tom Glavine | Scott Sanderson | Tom Glavine | Mitch Williams | 121 | 133 | -12 |
| 1989-05-17 | vs ATL | 38 | W 4-0 | 20-18 | 2 | 31,196 | Jeff Pico | Zane Smith | Jeff Pico | Zane Smith | | 125 | 133 | -8 |
| 1989-05-19 | @ CIN | 39 | W 8-2 | 21-18 | 2 | 29,202 | Greg Maddux | Danny Jackson | Greg Maddux | Danny Jackson | | 133 | 135 | -2 |
| 1989-05-20 | @ CIN | 40 | W 7-3 | 22-18 | 2 | 49,175 | Paul Kilgus | Tom Browning | Paul Kilgus | Tom Browning | Pat Perry | 140 | 138 | 2 |
| 1989-05-21 | @ CIN | 41 | L 2-7 | 22-19 | 2 | 34,128 | Mike Bielecki | Rick Mahler | Rick Mahler | Mike Bielecki | | 142 | 145 | -3 |
| 1989-05-22 | @ HOU | 42 | W 5-3 | 23-19 | 2 | 11,923 | Rick Sutcliffe | Jim Deshaies | Rick Sutcliffe | Jim Deshaies | Calvin Schiraldi | 147 | 148 | -1 |
| 1989-05-23 | @ HOU | 43 | W 5-4 | 24-19 | 1 | 15,665 | Scott Sanderson | Mike Scott | Scott Sanderson | Mike Scott | Calvin Schiraldi | 152 | 152 | 0 |
| 1989-05-24 | @ HOU | 44 | W 3-1 | 25-19 | 1 | 17,042 | Greg Maddux | Bob Knepper | Greg Maddux | Bob Knepper | Mitch Williams | 155 | 153 | 2 |
| 1989-05-26 | vs CIN | 45 | L 8-10 | 25-20 | 1 | 33,583 | Paul Kilgus | Rick Mahler | Rob Dibble | Calvin Schiraldi | | 163 | 163 | 0 |
| 1989-05-27 | vs CIN | 46 | W 5-3 | 26-20 | 1 | 34,546 | Rick Sutcliffe | Jose Rijo | Rick Sutcliffe | Jose Rijo | | 168 | 166 | 2 |
| 1989-05-28 | vs CIN | 47 | W 6-1 | 27-20 | 1 | 37,231 | Mike Bielecki | Danny Jackson | Mike Bielecki | Danny Jackson | | 174 | 167 | 7 |
| 1989-05-29 | @ ATL | 48 | L 1-2 | 27-21 | 1 | 15,123 | Scott Sanderson | Derek Lilliquist | Derek Lilliquist | Scott Sanderson | Joe Boever | 175 | 169 | 6 |
| 1989-05-30 | @ ATL | 49 | W 3-2 | 28-21 | 1 | 7,566 | Greg Maddux | Pete Smith | Greg Maddux | Pete Smith | Mitch Williams | 178 | 171 | 7 |
| 1989-05-31 | @ ATL | 50 | L 2-3 | 28-22 | 1 | 7,958 | Paul Kilgus | John Smoltz | John Smoltz | Paul Kilgus | Joe Boever | 180 | 174 | 6 |
| 1989-06-02 | @ SLN | 51 | W 5-2 | 29-22 | 1 | 46,448 | Rick Sutcliffe | Joe Magrane | Rick Sutcliffe | Joe Magrane | Mitch Williams | 185 | 176 | 9 |
| 1989-06-03 | @ SLN | 52 | L 5-6 | 29-23 | 1 | 44,719 | Mike Bielecki | Ken Hill | Dan Quisenberry | Calvin Schiraldi | | 190 | 182 | 8 |
| 1989-06-04 | @ SLN | 53 | W 11-3 | 30-23 | 1 | 45,659 | Scott Sanderson | Scott Terry | Scott Sanderson | Scott Terry | | 201 | 185 | 16 |
| 1989-06-05 | vs NYN | 54 | W 15-3 | 31-23 | 1 | 34,840 | Greg Maddux | David Cone | Greg Maddux | David Cone | | 216 | 188 | 28 |
| 1989-06-06 | vs NYN | 55 | W 8-4 | 32-23 | 1 | 33,558 | Paul Kilgus | Bob Ojeda | Paul Kilgus | Bob Ojeda | | 224 | 192 | 32 |
| 1989-06-07 | vs NYN | 56 | L 5-10 | 32-24 | 1 | 35,372 | Rick Sutcliffe | Dwight Gooden | Dwight Gooden | Rick Sutcliffe | Rick Aguilera | 229 | 202 | 27 |
| 1989-06-08 | vs NYN | 57 | W 5-4 | 33-24 | 1 | 36,358 | Mike Bielecki | Ron Darling | Mitch Williams | Don Aase | | 234 | 206 | 28 |
| 1989-06-09 | vs SLN | 58 | L 0-1 | 33-25 | 1 | 34,937 | Scott Sanderson | Jose DeLeon | Jose DeLeon | Scott Sanderson | Todd Worrell | 234 | 207 | 27 |
| 1989-06-10 | vs SLN | 59 | L 0-6 | 33-26 | 1 | 38,045 | Greg Maddux | Joe Magrane | Joe Magrane | Greg Maddux | | 234 | 213 | 21 |
| 1989-06-11 | vs SLN | 60 | L 7-10 | 33-27 | 1 | 35,450 | Paul Kilgus | Ken Hill | Cris Carpenter | Calvin Schiraldi | | 241 | 223 | 18 |
| 1989-06-12 | vs SLN | 61 | W 10-3 | 34-27 | 1 | 27,154 | Steve Wilson | Scott Terry | Steve Wilson | Scott Terry | | 251 | 226 | 25 |
| 1989-06-13 | @ NYN | 62 | W 4-2 | 35-27 | 1 | 26,664 | Mike Bielecki | Ron Darling | Mike Bielecki | Ron Darling | Mitch Williams | 255 | 228 | 27 |
| 1989-06-14 | @ NYN | 63 | L 0-2 | 35-28 | 1 | 27,278 | Scott Sanderson | Dwight Gooden | Dwight Gooden | Scott Sanderson | Rick Aguilera | 255 | 230 | 25 |
| 1989-06-15 | @ NYN | 64 | L 3-4 | 35-29 | 1 | 24,689 | Greg Maddux | Sid Fernandez | Rick Aguilera | Pat Perry | | 258 | 234 | 24 |
| 1989-06-16 | @ MON | 65 | L 5-8 | 35-30 | 2 | 26,264 | Paul Kilgus | Bryn Smith | Bryn Smith | Paul Kilgus | Tim Burke | 263 | 242 | 21 |
| 1989-06-17 | @ MON | 66 | W 3-2 | 36-30 | 1 | 35,095 | Rick Sutcliffe | Pascual Perez | Rick Sutcliffe | Pascual Perez | Mitch Williams | 266 | 244 | 22 |
| 1989-06-18 | @ MON | 67 | W 5-4 | 37-30 | 1 | 35,968 | Mike Bielecki | Mark Langston | Mike Bielecki | Mark Langston | Mitch Williams | 271 | 248 | 23 |
| 1989-06-20 | @ PIT | 68 | W 5-4 | 38-30 | 1 | 11,713 | Scott Sanderson | John Smiley | Calvin Schiraldi | Miguel Garcia | Paul Kilgus | 276 | 252 | 24 |
| 1989-06-21 | @ PIT | 69 | W 1-0 | 39-30 | 1 | 23,970 | Greg Maddux | Doug Drabek | Greg Maddux | Doug Bair | Mitch Williams | 277 | 252 | 25 |
| 1989-06-22 | @ PIT | 70 | W 8-0 | 40-30 | 1 | 16,430 | Rick Sutcliffe | Randy Kramer | Rick Sutcliffe | Randy Kramer | | 285 | 252 | 33 |
| 1989-06-23 | vs MON | 71 | L 1-5 | 40-31 | 1 | 36,239 | Mike Bielecki | Mark Langston | Mark Langston | Mike Bielecki | Tim Burke | 286 | 257 | 29 |
| 1989-06-24 | vs MON | 72 | L 0-5 | 40-32 | 1 | 36,068 | Paul Kilgus | Kevin Gross | Kevin Gross | Paul Kilgus | | 286 | 262 | 24 |
| 1989-06-25 | vs MON | 73 | L 0-5 | 40-33 | 2 | 34,491 | Scott Sanderson | Dennis Martinez | Dennis Martinez | Scott Sanderson | | 286 | 267 | 19 |
| 1989-06-26 | vs PIT | 74 | L 1-2 | 40-34 | 3 | 35,407 | Greg Maddux | Doug Drabek | Doug Drabek | Greg Maddux | | 287 | 269 | 18 |
| 1989-06-27 | vs PIT | 75 | L 4-5 | 40-35 | 3 | 35,646 | Rick Sutcliffe | Randy Kramer | Randy Kramer | Rick Sutcliffe | Bill Landrum | 291 | 274 | 17 |
| 1989-06-28 | vs PIT | 76 | L 1-3 | 40-36 | 3 | 34,114 | Mike Bielecki | Jeff Robinson | Jeff Robinson | Mike Bielecki | Bill Landrum | 292 | 277 | 15 |
| 1989-06-29 | @ SFN | 77 | L 2-12 | 40-37 | 3 | 12,339 | Paul Kilgus | Scott Garrelts | Jeff Brantley | Paul Kilgus | | 294 | 289 | 5 |
| 1989-06-30 | @ SFN | 78 | W 6-4 | 41-37 | 3 | 49,241 | Scott Sanderson | Trevor Wilson | Scott Sanderson | Trevor Wilson | Mitch Williams | 300 | 293 | 7 |
| 1989-07-01 | @ SFN | 79 | W 3-2 | 42-37 | 2 | 29,019 | Greg Maddux | Rick Reuschel | Greg Maddux | Rick Reuschel | Mitch Williams | 303 | 295 | 8 |
| 1989-07-02 | @ SFN | 80 | L 3-4 | 42-38 | 3 | 41,350 | Rick Sutcliffe | Mike LaCoss | Jeff Brantley | Rick Sutcliffe | Steve Bedrosian | 306 | 299 | 7 |
| 1989-07-04 | vs SDN | 81 | W 5-1 | 43-38 | 3 | 32,920 | Mike Bielecki | Ed Whitson | Mike Bielecki | Ed Whitson | Steve Wilson | 311 | 300 | 11 |
| 1989-07-05 | vs SDN | 82 | W 5-3 | 44-38 | 2 | 33,464 | Scott Sanderson | Dennis Rasmussen | Scott Sanderson | Dennis Rasmussen | Paul Kilgus | 316 | 303 | 13 |
| 1989-07-06 | vs SDN | 83 | W 7-3 | 45-38 | 2 | 34,814 | Greg Maddux | Walt Terrell | Greg Maddux | Walt Terrell | Mitch Williams | 323 | 306 | 17 |
| 1989-07-07 | vs LAN | 84 | W 6-4 | 46-38 | 2 | 35,434 | Rick Sutcliffe | John Tudor | Rick Sutcliffe | John Wetteland | Mitch Williams | 329 | 310 | 19 |
| 1989-07-08 | vs LAN | 85 | L 2-8 | 46-39 | 2 | 37,096 | Jeff Pico | Mike Morgan | Mike Morgan | Jeff Pico | | 331 | 318 | 13 |
| 1989-07-09 | vs LAN | 86 | W 11-4 | 47-39 | 2 | 35,533 | Mike Bielecki | Fernando Valenzuela | Mike Bielecki | Fernando Valenzuela | | 342 | 322 | 20 |
| 1989-07-13 | @ SDN | 87 | W 7-3 | 48-39 | 2 | 23,481 | Greg Maddux | Bruce Hurst | Greg Maddux | Bruce Hurst | Les Lancaster | 349 | 325 | 24 |
| 1989-07-14 | @ SDN | 88 | L 4-7 | 48-40 | 2 | 27,649 | Mike Bielecki | Ed Whitson | Ed Whitson | Mike Bielecki | Mark Davis | 353 | 332 | 21 |
| 1989-07-15 | @ SDN | 89 | L 2-3 | 48-41 | 4 | 54,717 | Paul Kilgus | Walt Terrell | Walt Terrell | Paul Kilgus | | 355 | 335 | 20 |
| 1989-07-16 | @ SDN | 90 | L 3-4 | 48-42 | 4 | 30,549 | Rick Sutcliffe | Dennis Rasmussen | Dennis Rasmussen | Rick Sutcliffe | Mark Davis | 358 | 339 | 19 |
| 1989-07-17 | @ LAN | 91 | W 6-3 | 49-42 | 2 | 39,914 | Scott Sanderson | Ramon Martinez | Les Lancaster | Tim Leary | Mitch Williams | 364 | 342 | 22 |
| 1989-07-18 | @ LAN | 92 | L 1-4 | 49-43 | 2 | 37,543 | Greg Maddux | Orel Hershiser | Orel Hershiser | Greg Maddux | | 365 | 346 | 19 |
| 1989-07-19 | @ LAN | 93 | W 4-0 | 50-43 | 2 | 40,050 | Mike Bielecki | Mike Morgan | Mike Bielecki | Mike Morgan | | 369 | 346 | 23 |
| 1989-07-20 | vs SFN | 94 | W 4-3 | 51-43 | 2 | 32,306 | Paul Kilgus | Mike LaCoss | Les Lancaster | Randy McCament | | 373 | 349 | 24 |
| 1989-07-21 | vs SFN | 95 | L 3-4 | 51-44 | 3 | 34,725 | Rick Sutcliffe | Scott Garrelts | Scott Garrelts | Rick Sutcliffe | Craig Lefferts | 376 | 353 | 23 |
| 1989-07-22 | vs SFN | 96 | W 5-2 | 52-44 | 3 | 35,530 | Scott Sanderson | Atlee Hammaker | Scott Sanderson | Atlee Hammaker | Les Lancaster | 381 | 355 | 26 |
| 1989-07-23 | vs SFN | 97 | W 9-5 | 53-44 | 3 | 35,707 | Greg Maddux | Don Robinson | Greg Maddux | Don Robinson | | 390 | 360 | 30 |
| 1989-07-24 | @ SLN | 98 | W 3-2 | 54-44 | 3 | 45,183 | Mike Bielecki | Scott Terry | Mike Bielecki | Scott Terry | Mitch Williams | 393 | 362 | 31 |
| 1989-07-25 | @ SLN | 99 | W 4-2 | 55-44 | 2 | 46,621 | Paul Kilgus | Joe Magrane | Paul Kilgus | Joe Magrane | Mitch Williams | 397 | 364 | 33 |
| 1989-07-26 | @ SLN | 100 | L 0-2 | 55-45 | 2 | 43,000 | Rick Sutcliffe | Jose DeLeon | Jose DeLeon | Rick Sutcliffe | Todd Worrell | 397 | 366 | 31 |
| 1989-07-28 | vs NYN | 101 | W 6-5 | 56-45 | 2 | 37,554 | Scott Sanderson | David Cone | Calvin Schiraldi | Rick Aguilera | Mitch Williams | 403 | 371 | 32 |
| 1989-07-29 | vs NYN | 102 | W 10-3 | 57-45 | 2 | 38,012 | Greg Maddux | Wally Whitehurst | Greg Maddux | Wally Whitehurst | | 413 | 374 | 39 |
| 1989-07-30 | vs NYN | 103 | W 6-4 | 58-45 | 2 | 36,837 | Mike Bielecki | Bob Ojeda | Les Lancaster | Rick Aguilera | | 419 | 378 | 41 |
| 1989-07-31 | @ PHI | 104 | W 10-2 | 59-46 | 2 | 0 | Rick Sutcliffe | Terry Mulholland | Rick Sutcliffe | Terry Mulholland | | 429 | 380 | 49 |
| 1989-07-31 | @ PHI | 105 | L 4-7 | 59-46 | 2 | 22,160 | Paul Kilgus | Don Carman | Don Carman | Paul Kilgus | Jeff Parrett | 433 | 387 | 46 |
| 1989-08-01 | @ PHI | 106 | W 4-1 | 60-46 | 2 | 23,614 | Steve Wilson | Larry McWilliams | Steve Wilson | Larry McWilliams | Mitch Williams | 437 | 388 | 49 |
| 1989-08-02 | @ PHI | 107 | L 0-6 | 60-47 | 2 | 21,688 | Scott Sanderson | Ken Howell | Ken Howell | Scott Sanderson | | 437 | 394 | 43 |
| 1989-08-03 | @ PHI | 108 | W 2-0 | 61-47 | 2 | 21,983 | Greg Maddux | Bruce Ruffin | Greg Maddux | Bruce Ruffin | Les Lancaster | 439 | 394 | 45 |
| 1989-08-04 | @ PIT | 109 | W 3-2 | 62-47 | 2 | 29,169 | Mike Bielecki | Doug Drabek | Mike Bielecki | Doug Drabek | Mitch Williams | 442 | 396 | 46 |
| 1989-08-05 | @ PIT | 110 | W 4-2 | 63-47 | 1 | 23,262 | Rick Sutcliffe | John Smiley | Steve Wilson | Bill Landrum | Les Lancaster | 446 | 398 | 48 |
| 1989-08-06 | @ PIT | 111 | L 4-5 | 63-48 | 1 | 24,716 | Jeff Pico | Jeff Robinson | Doug Drabek | Scott Sanderson | | 450 | 403 | 47 |
| 1989-08-07 | vs MON | 112 | W 5-2 | 64-48 | 1 | 39,002 | Greg Maddux | Pascual Perez | Greg Maddux | Pascual Perez | | 455 | 405 | 50 |
| 1989-08-08 | vs MON | 113 | W 4-2 | 65-48 | 1 | 38,126 | Mike Bielecki | Dennis Martinez | Mike Bielecki | Dennis Martinez | Les Lancaster | 459 | 407 | 52 |
| 1989-08-09 | vs MON | 114 | W 3-0 | 66-48 | 1 | 39,009 | Rick Sutcliffe | Bryn Smith | Rick Sutcliffe | Bryn Smith | Mitch Williams | 462 | 407 | 55 |
| 1989-08-10 | vs PHI | 115 | L 13-16 | 66-49 | 1 | 36,745 | Jeff Pico | Randy O'Neal | Jeff Parrett | Steve Wilson | | 475 | 423 | 52 |
| 1989-08-11 | vs PHI | 116 | W 9-2 | 67-49 | 1 | 36,440 | Greg Maddux | Don Carman | Greg Maddux | Don Carman | | 484 | 425 | 59 |
| 1989-08-12 | vs PHI | 117 | W 9-7 | 68-49 | 1 | 37,752 | Mike Bielecki | Ken Howell | Mike Bielecki | Ken Howell | Mitch Williams | 493 | 432 | 61 |
| 1989-08-13 | vs PHI | 118 | L 3-5 | 68-50 | 1 | 37,054 | Rick Sutcliffe | Bruce Ruffin | Jeff Parrett | Steve Wilson | | 496 | 437 | 59 |
| 1989-08-15 | @ CIN | 119 | W 5-2 | 69-50 | 1 | 31,694 | Greg Maddux | Rick Mahler | Mitch Williams | Mike Roesler | | 501 | 439 | 62 |
| 1989-08-16 | @ CIN | 120 | W 5-1 | 70-50 | 1 | 29,764 | Mike Bielecki | Tim Leary | Mike Bielecki | Tim Leary | | 506 | 440 | 66 |
| 1989-08-17 | @ CIN | 121 | W 3-2 | 71-50 | 1 | 29,278 | Rick Sutcliffe | Ron Robinson | Rick Sutcliffe | John Franco | Mitch Williams | 509 | 442 | 67 |
| 1989-08-18 | @ HOU | 122 | L 5-6 | 71-51 | 1 | 31,987 | Scott Sanderson | Jim Clancy | Dave Smith | Calvin Schiraldi | | 514 | 448 | 66 |
| 1989-08-19 | @ HOU | 123 | L 4-8 | 71-52 | 1 | 41,661 | Greg Maddux | Mark Portugal | Mark Portugal | Greg Maddux | | 518 | 456 | 62 |
| 1989-08-20 | @ HOU | 124 | L 4-8 | 71-53 | 1 | 38,624 | Mike Bielecki | Mike Scott | Danny Darwin | Les Lancaster | | 522 | 464 | 58 |
| 1989-08-21 | vs CIN | 125 | L 5-6 | 71-54 | 1 | 37,626 | Rick Sutcliffe | Ron Robinson | Norm Charlton | Calvin Schiraldi | John Franco | 527 | 470 | 57 |
| 1989-08-22 | vs CIN | 126 | L 2-7 | 71-55 | 1 | 35,179 | Joe Kraemer | Tom Browning | Tom Browning | Joe Kraemer | | 529 | 477 | 52 |
| 1989-08-23 | vs CIN | 127 | L 5-8 | 71-56 | 1 | 33,054 | Greg Maddux | Scott Scudder | Scott Scudder | Greg Maddux | | 534 | 485 | 49 |
| 1989-08-25 | vs ATL | 128 | W 4-3 | 72-56 | 1 | 35,456 | Mike Bielecki | John Smoltz | Mitch Williams | Mark Eichhorn | | 538 | 488 | 50 |
| 1989-08-26 | vs ATL | 129 | L 3-5 | 72-57 | 1 | 35,752 | Rick Sutcliffe | Derek Lilliquist | Sergio Valdez | Rick Sutcliffe | Joe Boever | 541 | 493 | 48 |
| 1989-08-27 | vs ATL | 130 | W 3-2 | 73-57 | 1 | 35,107 | Steve Wilson | Marty Clary | Mitch Williams | Mark Eichhorn | | 544 | 495 | 49 |
| 1989-08-28 | vs HOU | 131 | W 6-1 | 74-57 | 1 | 23,039 | Greg Maddux | Jose Cano | Greg Maddux | Jose Cano | | 550 | 496 | 54 |
| 1989-08-29 | vs HOU | 132 | W 10-9 | 75-57 | 1 | 25,829 | Mike Bielecki | Mark Portugal | Paul Assenmacher | Dave Smith | | 560 | 505 | 55 |
| 1989-08-30 | vs HOU | 133 | L 4-8 | 75-58 | 1 | 37,218 | Rick Sutcliffe | Mike Scott | Mike Scott | Rick Sutcliffe | | 564 | 513 | 51 |
| 1989-09-01 | @ ATL | 134 | L 1-5 | 75-59 | 1 | 14,255 | Steve Wilson | Derek Lilliquist | Derek Lilliquist | Steve Wilson | Mike Stanton | 565 | 518 | 47 |
| 1989-09-02 | @ ATL | 135 | W 10-3 | 76-59 | 1 | 41,020 | Greg Maddux | Marty Clary | Greg Maddux | Marty Clary | | 575 | 521 | 54 |
| 1989-09-03 | @ ATL | 136 | L 5-8 | 76-60 | 1 | 25,189 | Mike Bielecki | Pete Smith | Pete Smith | Mike Bielecki | Mike Stanton | 580 | 529 | 51 |
| 1989-09-04 | @ NYN | 137 | W 7-3 | 77-60 | 1 | 46,049 | Rick Sutcliffe | David Cone | Rick Sutcliffe | David Cone | Les Lancaster | 587 | 532 | 55 |
| 1989-09-05 | @ NYN | 138 | L 2-3 | 77-61 | 1 | 39,352 | Jeff Pico | Sid Fernandez | Sid Fernandez | Mitch Williams | | 589 | 535 | 54 |
| 1989-09-06 | @ PHI | 139 | L 1-9 | 77-62 | 1 | 17,272 | Greg Maddux | Bruce Ruffin | Bruce Ruffin | Greg Maddux | | 590 | 544 | 46 |
| 1989-09-07 | @ PHI | 140 | W 6-2 | 78-62 | 1 | 13,058 | Mike Bielecki | Ken Howell | Mike Bielecki | Ken Howell | | 596 | 546 | 50 |
| 1989-09-08 | vs SLN | 141 | L 8-11 | 78-63 | 1 | 35,231 | Paul Kilgus | Joe Magrane | Cris Carpenter | Mitch Williams | Dan Quisenberry | 604 | 557 | 47 |
| 1989-09-09 | vs SLN | 142 | W 3-2 | 79-63 | 1 | 37,633 | Rick Sutcliffe | Jose DeLeon | Paul Assenmacher | Ken Dayley | | 607 | 559 | 48 |
| 1989-09-10 | vs SLN | 143 | W 4-1 | 80-63 | 1 | 37,281 | Steve Wilson | Ken Hill | Scott Sanderson | Ken Hill | Mitch Williams | 611 | 560 | 51 |
| 1989-09-11 | vs MON | 144 | W 4-3 | 81-63 | 1 | 29,190 | Greg Maddux | Mark Langston | Greg Maddux | Mark Langston | Mitch Williams | 615 | 563 | 52 |
| 1989-09-12 | vs MON | 145 | W 2-0 | 82-63 | 1 | 36,333 | Mike Bielecki | Bryn Smith | Mike Bielecki | Bryn Smith | | 617 | 563 | 54 |
| 1989-09-13 | vs MON | 146 | W 3-1 | 83-63 | 1 | 34,870 | Scott Sanderson | Kevin Gross | Scott Sanderson | Kevin Gross | Les Lancaster | 620 | 564 | 56 |
| 1989-09-15 | @ PIT | 147 | W 7-2 | 84-63 | 1 | 12,607 | Rick Sutcliffe | Neal Heaton | Rick Sutcliffe | Stan Belinda | | 627 | 566 | 61 |
| 1989-09-16 | @ PIT | 148 | L 6-8 | 84-64 | 1 | 15,668 | Greg Maddux | John Smiley | John Smiley | Greg Maddux | | 633 | 574 | 59 |
| 1989-09-17 | @ PIT | 149 | L 0-2 | 84-65 | 1 | 21,081 | Mike Bielecki | Doug Drabek | Doug Drabek | Mike Bielecki | | 633 | 576 | 57 |
| 1989-09-18 | vs NYN | 150 | W 10-6 | 85-65 | 1 | 38,138 | Paul Kilgus | Frank Viola | Dean Wilkins | Frank Viola | Mitch Williams | 643 | 582 | 61 |
| 1989-09-19 | vs NYN | 151 | L 2-5 | 85-66 | 1 | 35,937 | Steve Wilson | Bob Ojeda | Bob Ojeda | Steve Wilson | Dwight Gooden | 645 | 587 | 58 |
| 1989-09-20 | vs PHI | 152 | L 8-9 | 85-67 | 1 | 21,620 | Rick Sutcliffe | Pat Combs | Don Carman | Les Lancaster | Roger McDowell | 653 | 596 | 57 |
| 1989-09-21 | vs PHI | 153 | W 9-1 | 86-67 | 1 | 22,885 | Greg Maddux | Terry Mulholland | Greg Maddux | Terry Mulholland | | 662 | 597 | 65 |
| 1989-09-22 | vs PIT | 154 | W 4-2 | 87-67 | 1 | 34,040 | Mike Bielecki | Doug Drabek | Mike Bielecki | Doug Drabek | Mitch Williams | 666 | 599 | 67 |
| 1989-09-23 | vs PIT | 155 | W 3-2 | 88-67 | 1 | 36,849 | Paul Kilgus | Bob Walk | Les Lancaster | Doug Bair | | 669 | 601 | 68 |
| 1989-09-24 | vs PIT | 156 | W 4-2 | 89-67 | 1 | 37,904 | Steve Wilson | Jeff Robinson | Steve Wilson | Jeff Robinson | Jeff Pico | 673 | 603 | 70 |
| 1989-09-25 | @ MON | 157 | L 3-4 | 89-68 | 1 | 10,305 | Rick Sutcliffe | Bryn Smith | Tim Burke | Scott Sanderson | | 676 | 607 | 69 |
| 1989-09-26 | @ MON | 158 | W 3-2 | 90-68 | 1 | 11,615 | Greg Maddux | Dennis Martinez | Greg Maddux | Dennis Martinez | Mitch Williams | 679 | 609 | 70 |
| 1989-09-27 | @ MON | 159 | W 7-2 | 91-68 | 1 | 12,442 | Mike Bielecki | Rich Thompson | Mike Bielecki | Rich Thompson | Jeff Pico | 686 | 611 | 75 |
| 1989-09-29 | @ SLN | 160 | L 5-7 | 91-69 | 1 | 41,599 | Steve Wilson | Bob Tewksbury | Ken Dayley | Paul Assenmacher | Scott Terry | 691 | 618 | 73 |
| 1989-09-30 | @ SLN | 161 | W 6-4 | 92-69 | 1 | 43,570 | Scott Sanderson | Jose DeLeon | Jeff Pico | John Costello | Les Lancaster | 697 | 622 | 75 |
| 1989-10-01 | @ SLN | 162 | W 5-1 | 93-69 | 1 | 37,846 | Rick Sutcliffe | Ken Hill | Rick Sutcliffe | Ken Hill | | 702 | 623 | 79 |