| 1989-04-03 | @ SDN | 1 | W 5-3 | 1-0 | 2 | 52,763 | Rick Reuschel | Eric Show | Rick Reuschel | Eric Show | Mike LaCoss | 5 | 3 | 2 |
| 1989-04-04 | @ SDN | 2 | W 8-3 | 2-0 | 3 | 21,768 | Kelly Downs | Bruce Hurst | Kelly Downs | Bruce Hurst | | 13 | 6 | 7 |
| 1989-04-05 | @ SDN | 3 | L 3-4 | 2-1 | 2 | 24,309 | Don Robinson | Ed Whitson | Ed Whitson | Don Robinson | Mark Davis | 16 | 10 | 6 |
| 1989-04-07 | @ CIN | 4 | L 3-4 | 2-2 | 4 | 25,278 | Scott Garrelts | Jose Rijo | Tim Birtsas | Joe Price | | 19 | 14 | 5 |
| 1989-04-09 | @ CIN | 5 | W 9-1 | 3-2 | 3 | 23,152 | Rick Reuschel | Danny Jackson | Rick Reuschel | Danny Jackson | | 28 | 15 | 13 |
| 1989-04-10 | vs LAN | 6 | L 4-7 | 3-3 | 5 | 53,015 | Don Robinson | Orel Hershiser | Orel Hershiser | Mike LaCoss | Alejandro Pena | 32 | 22 | 10 |
| 1989-04-11 | vs LAN | 7 | W 8-3 | 4-3 | 3 | 17,722 | Kelly Downs | Tim Leary | Kelly Downs | Tim Leary | Craig Lefferts | 40 | 25 | 15 |
| 1989-04-12 | vs LAN | 8 | W 3-1 | 5-3 | 2 | 19,035 | Scott Garrelts | Fernando Valenzuela | Scott Garrelts | Fernando Valenzuela | Mike LaCoss | 43 | 26 | 17 |
| 1989-04-14 | vs ATL | 9 | W 7-5 | 6-3 | 1 | 11,808 | Rick Reuschel | Zane Smith | Rick Reuschel | Zane Smith | Craig Lefferts | 50 | 31 | 19 |
| 1989-04-15 | vs ATL | 10 | W 1-0 | 7-3 | 1 | 29,798 | Don Robinson | Pete Smith | Atlee Hammaker | Pete Smith | | 51 | 31 | 20 |
| 1989-04-16 | vs ATL | 11 | L 2-7 | 8-4 | 1 | 0 | Kelly Downs | John Smoltz | John Smoltz | Kelly Downs | Jose Alvarez | 53 | 38 | 15 |
| 1989-04-16 | vs ATL | 12 | W 6-1 | 8-4 | 1 | 26,048 | Joe Price | Charlie Puleo | Joe Price | Charlie Puleo | | 59 | 39 | 20 |
| 1989-04-17 | vs SDN | 13 | W 9-0 | 9-4 | 1 | 12,161 | Scott Garrelts | Dennis Rasmussen | Scott Garrelts | Dennis Rasmussen | | 68 | 39 | 29 |
| 1989-04-18 | vs SDN | 14 | L 2-4 | 9-5 | 1 | 11,509 | Rick Reuschel | Walt Terrell | Walt Terrell | Rick Reuschel | Mark Davis | 70 | 43 | 27 |
| 1989-04-19 | vs SDN | 15 | L 3-4 | 9-6 | 1 | 22,701 | Don Robinson | Eric Show | Eric Show | Atlee Hammaker | Mark Davis | 73 | 47 | 26 |
| 1989-04-21 | @ LAN | 16 | L 2-8 | 9-7 | 1 | 47,251 | Kelly Downs | Orel Hershiser | Orel Hershiser | Kelly Downs | | 75 | 55 | 20 |
| 1989-04-22 | @ LAN | 17 | W 5-4 | 10-7 | 1 | 48,437 | Scott Garrelts | Tim Leary | Craig Lefferts | Jay Howell | | 80 | 59 | 21 |
| 1989-04-23 | @ LAN | 18 | L 6-7 | 10-8 | 1 | 48,493 | Rick Reuschel | Fernando Valenzuela | Jay Howell | Atlee Hammaker | | 86 | 66 | 20 |
| 1989-04-25 | @ SLN | 19 | W 4-0 | 11-8 | 1 | 27,911 | Don Robinson | Ken Hill | Don Robinson | Ken Hill | Craig Lefferts | 90 | 66 | 24 |
| 1989-04-26 | @ SLN | 20 | L 1-3 | 11-9 | 3 | 27,514 | Kelly Downs | Jose DeLeon | Jose DeLeon | Kelly Downs | Ken Dayley | 91 | 69 | 22 |
| 1989-04-27 | @ SLN | 21 | L 1-10 | 11-10 | 4 | 30,825 | Scott Garrelts | Scott Terry | Scott Terry | Scott Garrelts | | 92 | 79 | 13 |
| 1989-04-28 | @ PIT | 22 | L 0-1 | 11-11 | 4 | 12,913 | Rick Reuschel | John Smiley | John Smiley | Rick Reuschel | | 92 | 80 | 12 |
| 1989-04-29 | @ PIT | 23 | W 4-3 | 12-11 | 3 | 11,509 | Mike Krukow | Randy Kramer | Mike LaCoss | Jeff Robinson | | 96 | 83 | 13 |
| 1989-04-30 | @ PIT | 24 | L 1-11 | 12-12 | 3 | 20,940 | Don Robinson | Bob Walk | Bob Walk | Don Robinson | | 97 | 94 | 3 |
| 1989-05-01 | vs CHN | 25 | L 3-4 | 12-13 | 4 | 17,914 | Kelly Downs | Rick Sutcliffe | Jeff Pico | Mike LaCoss | Calvin Schiraldi | 100 | 98 | 2 |
| 1989-05-02 | vs CHN | 26 | W 4-0 | 13-13 | 4 | 11,128 | Rick Reuschel | Greg Maddux | Rick Reuschel | Greg Maddux | Rich Gossage | 104 | 98 | 6 |
| 1989-05-03 | vs PIT | 27 | L 3-5 | 13-14 | 4 | 8,536 | Don Robinson | John Smiley | John Smiley | Don Robinson | Logan Easley | 107 | 103 | 4 |
| 1989-05-04 | vs PIT | 28 | W 6-3 | 14-14 | 4 | 11,820 | Mike Krukow | Randy Kramer | Mike Krukow | Randy Kramer | Craig Lefferts | 113 | 106 | 7 |
| 1989-05-05 | vs SLN | 29 | L 1-3 | 14-15 | 4 | 24,401 | Scott Garrelts | Joe Magrane | Frank DiPino | Mike LaCoss | Todd Worrell | 114 | 109 | 5 |
| 1989-05-06 | vs SLN | 30 | W 9-0 | 15-15 | 4 | 26,925 | Rick Reuschel | Jose DeLeon | Rick Reuschel | Jose DeLeon | Mike LaCoss | 123 | 109 | 14 |
| 1989-05-07 | vs SLN | 31 | W 5-1 | 16-15 | 2 | 50,492 | Don Robinson | Scott Terry | Don Robinson | Scott Terry | | 128 | 110 | 18 |
| 1989-05-09 | @ CHN | 32 | W 4-2 | 17-15 | 2 | 13,949 | Mike Krukow | Paul Kilgus | Mike Krukow | Paul Kilgus | Craig Lefferts | 132 | 112 | 20 |
| 1989-05-10 | @ CHN | 33 | W 4-3 | 18-15 | 1 | 25,638 | Scott Garrelts | Mike Bielecki | Mike LaCoss | Mitch Williams | Craig Lefferts | 136 | 115 | 21 |
| 1989-05-12 | @ MON | 34 | W 2-1 | 19-15 | 1 | 15,851 | Rick Reuschel | Pascual Perez | Rick Reuschel | Pascual Perez | Rich Gossage | 138 | 116 | 22 |
| 1989-05-13 | @ MON | 35 | L 4-5 | 19-16 | 2 | 13,029 | Don Robinson | Kevin Gross | Tim Burke | Atlee Hammaker | | 142 | 121 | 21 |
| 1989-05-14 | @ MON | 36 | L 3-4 | 19-17 | 2 | 19,835 | Mike Krukow | Dennis Martinez | Dennis Martinez | Mike Krukow | Tim Burke | 145 | 125 | 20 |
| 1989-05-15 | @ PHI | 37 | L 2-3 | 19-18 | 2 | 15,703 | Scott Garrelts | Don Carman | Steve Bedrosian | Craig Lefferts | | 147 | 128 | 19 |
| 1989-05-16 | @ PHI | 38 | W 13-5 | 20-18 | 2 | 14,074 | Atlee Hammaker | Mike Maddux | Atlee Hammaker | Mike Maddux | | 160 | 133 | 27 |
| 1989-05-17 | @ PHI | 39 | W 6-0 | 21-18 | 2 | 18,943 | Rick Reuschel | Ken Howell | Rick Reuschel | Ken Howell | | 166 | 133 | 33 |
| 1989-05-19 | @ NYN | 40 | L 2-3 | 21-19 | 2 | 37,402 | Don Robinson | David Cone | Randy Myers | Craig Lefferts | | 168 | 136 | 32 |
| 1989-05-20 | @ NYN | 41 | W 3-0 | 22-19 | 2 | 45,565 | Mike Krukow | Bob Ojeda | Mike Krukow | Bob Ojeda | Mike LaCoss | 171 | 136 | 35 |
| 1989-05-21 | @ NYN | 42 | W 10-6 | 23-19 | 2 | 44,660 | Scott Garrelts | Sid Fernandez | Atlee Hammaker | Roger McDowell | Craig Lefferts | 181 | 142 | 39 |
| 1989-05-23 | vs MON | 43 | W 4-2 | 24-19 | 2 | 13,018 | Rick Reuschel | Brian Holman | Rick Reuschel | Brian Holman | Mike LaCoss | 185 | 144 | 41 |
| 1989-05-24 | vs MON | 44 | L 0-1 | 24-20 | 2 | 9,889 | Don Robinson | Kevin Gross | Kevin Gross | Don Robinson | | 185 | 145 | 40 |
| 1989-05-25 | vs MON | 45 | L 0-2 | 24-21 | 2 | 14,125 | Mike Krukow | Dennis Martinez | Dennis Martinez | Mike Krukow | Tim Burke | 185 | 147 | 38 |
| 1989-05-26 | vs PHI | 46 | W 6-1 | 25-21 | 2 | 12,787 | Scott Garrelts | Bob Sebra | Scott Garrelts | Bob Sebra | | 191 | 148 | 43 |
| 1989-05-27 | vs PHI | 47 | W 6-2 | 26-21 | 2 | 18,325 | Atlee Hammaker | Alex Madrid | Atlee Hammaker | Alex Madrid | Craig Lefferts | 197 | 150 | 47 |
| 1989-05-28 | vs PHI | 48 | W 8-5 | 27-21 | 2 | 51,498 | Rick Reuschel | Ken Howell | Rick Reuschel | Ken Howell | Mike LaCoss | 205 | 155 | 50 |
| 1989-05-29 | vs NYN | 49 | W 3-2 | 28-21 | 1 | 38,899 | Don Robinson | Ron Darling | Don Robinson | Ron Darling | Craig Lefferts | 208 | 157 | 51 |
| 1989-05-30 | vs NYN | 50 | W 10-3 | 29-21 | 1 | 17,398 | Mike Krukow | David Cone | Mike Krukow | David Cone | | 218 | 160 | 58 |
| 1989-05-31 | vs NYN | 51 | L 1-3 | 29-22 | 1 | 21,658 | Scott Garrelts | Bob Ojeda | Randy Myers | Craig Lefferts | Rick Aguilera | 219 | 163 | 56 |
| 1989-06-02 | @ ATL | 52 | W 7-6 | 30-22 | 1 | 14,052 | Rick Reuschel | Tom Glavine | Rick Reuschel | Tom Glavine | Rich Gossage | 226 | 169 | 57 |
| 1989-06-03 | @ ATL | 53 | W 4-0 | 31-22 | 1 | 16,181 | Don Robinson | Zane Smith | Atlee Hammaker | Zane Smith | | 230 | 169 | 61 |
| 1989-06-04 | @ ATL | 54 | L 3-6 | 31-23 | 2 | 13,700 | Mike Krukow | Derek Lilliquist | Derek Lilliquist | Mike Krukow | Joe Boever | 233 | 175 | 58 |
| 1989-06-05 | @ CIN | 55 | W 11-8 | 32-23 | 1 | 20,828 | Scott Garrelts | Jose Rijo | Scott Garrelts | Jose Rijo | | 244 | 183 | 61 |
| 1989-06-06 | @ CIN | 56 | L 3-4 | 33-24 | 1 | 0 | Terry Mulholland | Scott Scudder | John Franco | Mike LaCoss | | 247 | 187 | 60 |
| 1989-06-06 | @ CIN | 57 | W 3-2 | 33-24 | 1 | 28,380 | Rick Reuschel | Tom Browning | Rick Reuschel | Rob Dibble | Craig Lefferts | 250 | 189 | 61 |
| 1989-06-07 | @ CIN | 58 | L 5-12 | 33-25 | 3 | 25,896 | Atlee Hammaker | Rick Mahler | Rick Mahler | Atlee Hammaker | | 255 | 201 | 54 |
| 1989-06-08 | @ CIN | 59 | L 2-3 | 33-26 | 3 | 29,217 | Dennis Cook | Danny Jackson | Rob Dibble | Mike LaCoss | John Franco | 257 | 204 | 53 |
| 1989-06-09 | vs SDN | 60 | W 12-2 | 34-26 | 3 | 17,463 | Don Robinson | Bruce Hurst | Don Robinson | Bruce Hurst | | 269 | 206 | 63 |
| 1989-06-10 | vs SDN | 61 | W 1-0 | 35-26 | 3 | 29,116 | Scott Garrelts | Ed Whitson | Scott Garrelts | Ed Whitson | Craig Lefferts | 270 | 206 | 64 |
| 1989-06-11 | vs SDN | 62 | W 3-1 | 36-26 | 3 | 42,003 | Rick Reuschel | Dennis Rasmussen | Rich Gossage | Mark Davis | | 273 | 207 | 66 |
| 1989-06-13 | vs ATL | 63 | W 3-2 | 37-26 | 2 | 10,484 | Atlee Hammaker | Zane Smith | Atlee Hammaker | Zane Smith | Craig Lefferts | 276 | 209 | 67 |
| 1989-06-14 | vs ATL | 64 | W 10-1 | 38-26 | 1 | 12,140 | Don Robinson | Derek Lilliquist | Don Robinson | Derek Lilliquist | | 286 | 210 | 76 |
| 1989-06-15 | vs ATL | 65 | L 1-2 | 38-27 | 1 | 9,403 | Scott Garrelts | John Smoltz | John Smoltz | Scott Garrelts | | 287 | 212 | 75 |
| 1989-06-16 | vs CIN | 66 | L 4-5 | 38-28 | 2 | 23,986 | Rick Reuschel | Rick Mahler | Norm Charlton | Rich Gossage | John Franco | 291 | 217 | 74 |
| 1989-06-17 | vs CIN | 67 | W 8-1 | 39-28 | 1 | 34,476 | Dennis Cook | Danny Jackson | Dennis Cook | Danny Jackson | | 299 | 218 | 81 |
| 1989-06-18 | vs CIN | 68 | W 2-1 | 40-28 | 1 | 44,542 | Atlee Hammaker | Jose Rijo | Mike LaCoss | Jose Rijo | Craig Lefferts | 301 | 219 | 82 |
| 1989-06-19 | vs HOU | 69 | W 3-2 | 41-28 | 1 | 22,386 | Don Robinson | Bob Knepper | Don Robinson | Bob Knepper | Steve Bedrosian | 304 | 221 | 83 |
| 1989-06-20 | vs HOU | 70 | W 4-0 | 42-28 | 1 | 21,074 | Scott Garrelts | Bob Forsch | Scott Garrelts | Bob Forsch | Craig Lefferts | 308 | 221 | 87 |
| 1989-06-21 | vs HOU | 71 | W 2-0 | 43-28 | 1 | 32,730 | Rick Reuschel | Jim Clancy | Rick Reuschel | Jim Clancy | Steve Bedrosian | 310 | 221 | 89 |
| 1989-06-23 | @ SDN | 72 | W 8-7 | 44-28 | 1 | 21,721 | Mike LaCoss | Dennis Rasmussen | Rich Gossage | Greg Harris | Steve Bedrosian | 318 | 228 | 90 |
| 1989-06-24 | @ SDN | 73 | W 3-1 | 45-28 | 1 | 32,615 | Don Robinson | Walt Terrell | Don Robinson | Walt Terrell | Steve Bedrosian | 321 | 229 | 92 |
| 1989-06-25 | @ SDN | 74 | L 7-10 | 45-29 | 1 | 41,028 | Scott Garrelts | Eric Show | Mark Grant | Scott Garrelts | Mark Davis | 328 | 239 | 89 |
| 1989-06-26 | @ HOU | 75 | W 4-3 | 46-29 | 1 | 11,616 | Rick Reuschel | Bob Forsch | Craig Lefferts | Juan Agosto | Steve Bedrosian | 332 | 242 | 90 |
| 1989-06-27 | @ HOU | 76 | L 5-7 | 46-30 | 1 | 33,231 | Mike LaCoss | Jim Clancy | Danny Darwin | Steve Bedrosian | | 337 | 249 | 88 |
| 1989-06-28 | @ HOU | 77 | L 3-7 | 46-31 | 1 | 29,817 | Don Robinson | Jim Deshaies | Jim Deshaies | Don Robinson | | 340 | 256 | 84 |
| 1989-06-29 | vs CHN | 78 | W 12-2 | 47-31 | 1 | 12,339 | Scott Garrelts | Paul Kilgus | Jeff Brantley | Paul Kilgus | | 352 | 258 | 94 |
| 1989-06-30 | vs CHN | 79 | L 4-6 | 47-32 | 1 | 49,241 | Trevor Wilson | Scott Sanderson | Scott Sanderson | Trevor Wilson | Mitch Williams | 356 | 264 | 92 |
| 1989-07-01 | vs CHN | 80 | L 2-3 | 47-33 | 1 | 29,019 | Rick Reuschel | Greg Maddux | Greg Maddux | Rick Reuschel | Mitch Williams | 358 | 267 | 91 |
| 1989-07-02 | vs CHN | 81 | W 4-3 | 48-33 | 1 | 41,350 | Mike LaCoss | Rick Sutcliffe | Jeff Brantley | Rick Sutcliffe | Steve Bedrosian | 362 | 270 | 92 |
| 1989-07-04 | @ PIT | 82 | L 3-5 | 48-34 | 1 | 14,186 | Don Robinson | Randy Kramer | Randy Kramer | Don Robinson | Bill Landrum | 365 | 275 | 90 |
| 1989-07-05 | @ PIT | 83 | W 6-4 | 49-34 | 1 | 22,242 | Trevor Wilson | Bob Walk | Trevor Wilson | Bob Walk | | 371 | 279 | 92 |
| 1989-07-06 | @ PIT | 84 | W 2-1 | 50-34 | 1 | 18,165 | Rick Reuschel | John Smiley | Jeff Brantley | John Smiley | Craig Lefferts | 373 | 280 | 93 |
| 1989-07-07 | @ SLN | 85 | L 4-6 | 50-35 | 1 | 42,627 | Mike LaCoss | Jose DeLeon | Frank DiPino | Mike LaCoss | Ken Dayley | 377 | 286 | 91 |
| 1989-07-08 | @ SLN | 86 | W 8-5 | 51-35 | 1 | 47,400 | Don Robinson | Ted Power | Jeff Brantley | Ted Power | | 385 | 291 | 94 |
| 1989-07-09 | @ SLN | 87 | L 4-6 | 51-36 | 1 | 41,985 | Trevor Wilson | Joe Magrane | Joe Magrane | Trevor Wilson | Ken Dayley | 389 | 297 | 92 |
| 1989-07-13 | vs PIT | 88 | W 3-2 | 52-36 | 1 | 17,178 | Don Robinson | Bob Walk | Jeff Brantley | Miguel Garcia | | 392 | 299 | 93 |
| 1989-07-14 | vs PIT | 89 | L 4-7 | 52-37 | 1 | 18,238 | Rick Reuschel | Doug Drabek | Doug Drabek | Rick Reuschel | Bill Landrum | 396 | 306 | 90 |
| 1989-07-15 | vs PIT | 90 | W 8-3 | 53-37 | 1 | 27,881 | Mike LaCoss | John Smiley | Mike LaCoss | John Smiley | | 404 | 309 | 95 |
| 1989-07-16 | vs PIT | 91 | W 3-1 | 54-37 | 1 | 44,781 | Scott Garrelts | Jeff Robinson | Scott Garrelts | Jeff Robinson | Steve Bedrosian | 407 | 310 | 97 |
| 1989-07-17 | vs SLN | 92 | W 8-4 | 55-37 | 1 | 25,643 | Atlee Hammaker | Ted Power | Randy McCament | Ted Power | Rich Gossage | 415 | 314 | 101 |
| 1989-07-18 | vs SLN | 93 | W 7-3 | 56-37 | 1 | 18,112 | Don Robinson | Ken Hill | Don Robinson | Ken Hill | | 422 | 317 | 105 |
| 1989-07-19 | vs SLN | 94 | W 7-5 | 57-37 | 1 | 38,282 | Trevor Wilson | Scott Terry | Jeff Brantley | Scott Terry | Craig Lefferts | 429 | 322 | 107 |
| 1989-07-20 | @ CHN | 95 | L 3-4 | 57-38 | 1 | 32,306 | Mike LaCoss | Paul Kilgus | Les Lancaster | Randy McCament | | 432 | 326 | 106 |
| 1989-07-21 | @ CHN | 96 | W 4-3 | 58-38 | 1 | 34,725 | Scott Garrelts | Rick Sutcliffe | Scott Garrelts | Rick Sutcliffe | Craig Lefferts | 436 | 329 | 107 |
| 1989-07-22 | @ CHN | 97 | L 2-5 | 58-39 | 1 | 35,530 | Atlee Hammaker | Scott Sanderson | Scott Sanderson | Atlee Hammaker | Les Lancaster | 438 | 334 | 104 |
| 1989-07-23 | @ CHN | 98 | L 5-9 | 58-40 | 1 | 35,707 | Don Robinson | Greg Maddux | Greg Maddux | Don Robinson | | 443 | 343 | 100 |
| 1989-07-24 | @ ATL | 99 | W 2-0 | 59-40 | 1 | 12,985 | Rick Reuschel | John Smoltz | Rick Reuschel | John Smoltz | Steve Bedrosian | 445 | 343 | 102 |
| 1989-07-25 | @ ATL | 100 | W 5-4 | 60-40 | 1 | 10,564 | Mike LaCoss | Derek Lilliquist | Mike LaCoss | Derek Lilliquist | Craig Lefferts | 450 | 347 | 103 |
| 1989-07-26 | @ ATL | 101 | L 4-5 | 60-41 | 1 | 8,055 | Scott Garrelts | Marty Clary | Joe Boever | Steve Bedrosian | | 454 | 352 | 102 |
| 1989-07-27 | @ ATL | 102 | L 1-10 | 60-42 | 1 | 10,471 | Atlee Hammaker | Tom Glavine | Tom Glavine | Atlee Hammaker | | 455 | 362 | 93 |
| 1989-07-28 | @ HOU | 103 | W 3-2 | 61-42 | 1 | 38,845 | Don Robinson | Jim Clancy | Don Robinson | Jim Clancy | | 458 | 364 | 94 |
| 1989-07-29 | @ HOU | 104 | L 1-8 | 61-43 | 1 | 39,602 | Rick Reuschel | Mark Portugal | Mark Portugal | Rick Reuschel | | 459 | 372 | 87 |
| 1989-07-30 | @ HOU | 105 | L 2-6 | 61-44 | 1 | 41,088 | Mike LaCoss | Mike Scott | Mike Scott | Mike LaCoss | | 461 | 378 | 83 |
| 1989-08-01 | @ LAN | 106 | W 5-2 | 62-44 | 1 | 35,716 | Scott Garrelts | Fernando Valenzuela | Scott Garrelts | Fernando Valenzuela | Craig Lefferts | 466 | 380 | 86 |
| 1989-08-02 | @ LAN | 107 | L 4-7 | 62-45 | 1 | 45,478 | Atlee Hammaker | Ramon Martinez | Ramon Martinez | Trevor Wilson | Jay Howell | 470 | 387 | 83 |
| 1989-08-03 | @ LAN | 108 | L 3-6 | 62-46 | 1 | 43,516 | Russ Swan | Orel Hershiser | Orel Hershiser | Russ Swan | Jay Howell | 473 | 393 | 80 |
| 1989-08-04 | vs HOU | 109 | W 4-2 | 63-46 | 1 | 26,648 | Don Robinson | Mark Portugal | Don Robinson | Danny Darwin | | 477 | 395 | 82 |
| 1989-08-05 | vs HOU | 110 | W 7-0 | 64-46 | 1 | 33,736 | Mike LaCoss | Mike Scott | Mike LaCoss | Mike Scott | | 484 | 395 | 89 |
| 1989-08-06 | vs HOU | 111 | L 2-3 | 64-47 | 1 | 52,292 | Bob Knepper | Rick Rhoden | Juan Agosto | Craig Lefferts | Dave Smith | 486 | 398 | 88 |
| 1989-08-07 | vs CIN | 112 | L 2-10 | 64-48 | 1 | 23,905 | Jeff Brantley | Ron Robinson | Ron Robinson | Jeff Brantley | Tim Birtsas | 488 | 408 | 80 |
| 1989-08-08 | vs CIN | 113 | L 4-10 | 64-49 | 1 | 20,765 | Russ Swan | Tom Browning | Tom Browning | Russ Swan | | 492 | 418 | 74 |
| 1989-08-09 | vs CIN | 114 | W 10-1 | 65-49 | 1 | 29,441 | Don Robinson | Rick Mahler | Don Robinson | Rick Mahler | | 502 | 419 | 83 |
| 1989-08-10 | vs CIN | 115 | W 4-3 | 66-49 | 1 | 34,810 | Dave Dravecky | Scott Scudder | Dave Dravecky | Scott Scudder | Steve Bedrosian | 506 | 422 | 84 |
| 1989-08-11 | vs LAN | 116 | W 10-2 | 67-49 | 1 | 33,307 | Mike LaCoss | Tim Belcher | Mike LaCoss | Tim Belcher | | 516 | 424 | 92 |
| 1989-08-12 | vs LAN | 117 | L 1-5 | 67-50 | 1 | 49,772 | Bob Knepper | Fernando Valenzuela | Fernando Valenzuela | Bob Knepper | | 517 | 429 | 88 |
| 1989-08-13 | vs LAN | 118 | L 2-3 | 67-51 | 1 | 53,821 | Kelly Downs | Orel Hershiser | Jay Howell | Don Robinson | Alejandro Pena | 519 | 432 | 87 |
| 1989-08-15 | @ MON | 119 | W 3-2 | 68-51 | 1 | 24,490 | Dave Dravecky | Bryn Smith | Dave Dravecky | Bryn Smith | Steve Bedrosian | 522 | 434 | 88 |
| 1989-08-16 | @ MON | 120 | L 2-4 | 68-52 | 1 | 24,719 | Mike LaCoss | Mark Langston | Tim Burke | Steve Bedrosian | | 524 | 438 | 86 |
| 1989-08-17 | @ MON | 121 | W 10-5 | 69-52 | 1 | 21,057 | Don Robinson | Kevin Gross | Bob Knepper | Joe Hesketh | | 534 | 443 | 91 |
| 1989-08-18 | @ PHI | 122 | W 5-2 | 70-52 | 1 | 23,368 | Rick Reuschel | Bruce Ruffin | Rick Reuschel | Bruce Ruffin | Steve Bedrosian | 539 | 445 | 94 |
| 1989-08-19 | @ PHI | 123 | L 0-1 | 70-53 | 1 | 30,366 | Kelly Downs | Terry Mulholland | Terry Mulholland | Kelly Downs | | 539 | 446 | 93 |
| 1989-08-20 | @ PHI | 124 | W 5-2 | 71-53 | 1 | 36,530 | Scott Garrelts | Dennis Cook | Jeff Brantley | Roger McDowell | | 544 | 448 | 96 |
| 1989-08-21 | @ NYN | 125 | L 1-4 | 71-54 | 1 | 41,200 | Mike LaCoss | Ron Darling | Ron Darling | Mike LaCoss | Randy Myers | 545 | 452 | 93 |
| 1989-08-22 | @ NYN | 126 | W 5-0 | 72-54 | 1 | 48,249 | Bob Knepper | Frank Viola | Bob Knepper | Frank Viola | | 550 | 452 | 98 |
| 1989-08-23 | @ NYN | 127 | W 5-0 | 73-54 | 1 | 43,694 | Rick Reuschel | David Cone | Rick Reuschel | David Cone | | 555 | 452 | 103 |
| 1989-08-25 | vs MON | 128 | L 2-12 | 73-55 | 1 | 23,272 | Kelly Downs | Dennis Martinez | Dennis Martinez | Kelly Downs | | 557 | 464 | 93 |
| 1989-08-26 | vs MON | 129 | W 8-3 | 74-55 | 1 | 29,527 | Scott Garrelts | Mark Langston | Scott Garrelts | Mark Langston | | 565 | 467 | 98 |
| 1989-08-27 | vs MON | 130 | L 3-6 | 74-56 | 1 | 31,536 | Mike LaCoss | Bryn Smith | Bryn Smith | Mike LaCoss | Tim Burke | 568 | 473 | 95 |
| 1989-08-28 | vs PHI | 131 | L 1-9 | 74-57 | 1 | 15,614 | Rick Reuschel | Ken Howell | Ken Howell | Rick Reuschel | | 569 | 482 | 87 |
| 1989-08-29 | vs PHI | 132 | L 1-6 | 74-58 | 1 | 13,952 | Don Robinson | Bruce Ruffin | Bruce Ruffin | Don Robinson | Roger McDowell | 570 | 488 | 82 |
| 1989-08-30 | vs PHI | 133 | W 3-2 | 75-58 | 1 | 19,053 | Kelly Downs | Terry Mulholland | Kelly Downs | Terry Mulholland | Steve Bedrosian | 573 | 490 | 83 |
| 1989-09-01 | vs NYN | 134 | W 7-1 | 76-58 | 1 | 29,413 | Scott Garrelts | Ron Darling | Scott Garrelts | Ron Darling | | 580 | 491 | 89 |
| 1989-09-02 | vs NYN | 135 | W 6-2 | 77-58 | 1 | 31,066 | Rick Reuschel | Frank Viola | Rick Reuschel | Frank Viola | | 586 | 493 | 93 |
| 1989-09-03 | vs NYN | 136 | W 4-0 | 78-58 | 1 | 44,084 | Don Robinson | Bob Ojeda | Don Robinson | Bob Ojeda | | 590 | 493 | 97 |
| 1989-09-04 | @ CIN | 137 | W 9-8 | 79-58 | 1 | 15,140 | Kelly Downs | Tim Leary | Ernie Camacho | John Franco | Steve Bedrosian | 599 | 501 | 98 |
| 1989-09-05 | @ CIN | 138 | L 5-6 | 79-59 | 1 | 16,389 | Mike LaCoss | Jack Armstrong | Jack Armstrong | Mike LaCoss | John Franco | 604 | 507 | 97 |
| 1989-09-06 | @ ATL | 139 | W 7-2 | 80-59 | 1 | 2,735 | Scott Garrelts | Derek Lilliquist | Scott Garrelts | Derek Lilliquist | | 611 | 509 | 102 |
| 1989-09-07 | @ ATL | 140 | W 7-5 | 81-59 | 1 | 4,474 | Rick Reuschel | Marty Clary | Steve Bedrosian | Mike Stanton | | 618 | 514 | 104 |
| 1989-09-08 | @ HOU | 141 | L 2-5 | 81-60 | 1 | 24,405 | Don Robinson | Mark Portugal | Mark Portugal | Don Robinson | Danny Darwin | 620 | 519 | 101 |
| 1989-09-09 | @ HOU | 142 | L 1-4 | 81-61 | 1 | 37,711 | Kelly Downs | Mike Scott | Mike Scott | Kelly Downs | | 621 | 523 | 98 |
| 1989-09-10 | @ HOU | 143 | W 5-3 | 82-61 | 1 | 26,004 | Bob Knepper | Rick Rhoden | Bob Knepper | Rick Rhoden | Craig Lefferts | 626 | 526 | 100 |
| 1989-09-11 | vs ATL | 144 | W 3-2 | 83-61 | 1 | 11,930 | Scott Garrelts | Derek Lilliquist | Scott Garrelts | Tony Castillo | Steve Bedrosian | 629 | 528 | 101 |
| 1989-09-12 | vs ATL | 145 | L 5-6 | 83-62 | 1 | 11,077 | Rick Reuschel | Marty Clary | Jay Aldrich | Steve Bedrosian | Mike Stanton | 634 | 534 | 100 |
| 1989-09-13 | vs CIN | 146 | W 8-7 | 84-62 | 1 | 13,827 | Don Robinson | Scott Scudder | Ernie Camacho | Rosario Rodriguez | | 642 | 541 | 101 |
| 1989-09-14 | vs CIN | 147 | W 4-3 | 85-62 | 1 | 15,969 | Mike LaCoss | Tim Leary | Ernie Camacho | Norm Charlton | | 646 | 544 | 102 |
| 1989-09-15 | vs SDN | 148 | L 3-5 | 85-63 | 1 | 33,920 | Bob Knepper | Dennis Rasmussen | Dennis Rasmussen | Bob Knepper | Greg Harris | 649 | 549 | 100 |
| 1989-09-17 | vs SDN | 149 | W 5-3 | 86-64 | 1 | 0 | Scott Garrelts | Calvin Schiraldi | Scott Garrelts | Greg Harris | Steve Bedrosian | 654 | 552 | 102 |
| 1989-09-17 | vs SDN | 150 | L 1-6 | 86-64 | 1 | 25,543 | Rick Reuschel | Bruce Hurst | Bruce Hurst | Rick Reuschel | | 655 | 558 | 97 |
| 1989-09-19 | vs LAN | 151 | W 3-2 | 87-64 | 1 | 20,668 | Mike LaCoss | Orel Hershiser | Mike LaCoss | Orel Hershiser | Steve Bedrosian | 658 | 560 | 98 |
| 1989-09-20 | vs LAN | 152 | W 8-7 | 88-64 | 1 | 21,420 | Bob Knepper | John Wetteland | Trevor Wilson | Mike Hartley | | 666 | 567 | 99 |
| 1989-09-21 | vs LAN | 153 | W 4-3 | 89-64 | 1 | 24,896 | Kelly Downs | Ramon Martinez | Kelly Downs | Ramon Martinez | Steve Bedrosian | 670 | 570 | 100 |
| 1989-09-22 | vs HOU | 154 | L 1-3 | 89-65 | 1 | 33,020 | Scott Garrelts | Mark Portugal | Mark Portugal | Scott Garrelts | Dan Schatzeder | 671 | 573 | 98 |
| 1989-09-23 | vs HOU | 155 | W 3-1 | 90-65 | 1 | 46,664 | Rick Reuschel | Mike Scott | Rick Reuschel | Mike Scott | | 674 | 574 | 100 |
| 1989-09-24 | vs HOU | 156 | W 10-2 | 91-65 | 1 | 50,871 | Mike LaCoss | Jim Clancy | Mike LaCoss | Jim Clancy | | 684 | 576 | 108 |
| 1989-09-25 | @ LAN | 157 | L 2-5 | 91-66 | 1 | 23,007 | Don Robinson | John Wetteland | John Wetteland | Don Robinson | Alejandro Pena | 686 | 581 | 105 |
| 1989-09-26 | @ LAN | 158 | L 1-2 | 91-67 | 1 | 27,622 | Kelly Downs | Ramon Martinez | Ramon Martinez | Kelly Downs | Jay Howell | 687 | 583 | 104 |
| 1989-09-27 | @ LAN | 159 | L 0-1 | 91-68 | 1 | 34,210 | Scott Garrelts | Tim Belcher | Tim Belcher | Scott Garrelts | | 687 | 584 | 103 |
| 1989-09-29 | @ SDN | 160 | W 7-2 | 92-68 | 1 | 52,089 | Mike LaCoss | Andy Benes | Mike LaCoss | Andy Benes | | 694 | 586 | 108 |
| 1989-09-30 | @ SDN | 161 | L 5-11 | 92-69 | 1 | 47,787 | Rick Reuschel | Eric Nolte | Mark Grant | Rick Reuschel | | 699 | 597 | 102 |
| 1989-10-01 | @ SDN | 162 | L 0-3 | 92-70 | 1 | 24,031 | Kelly Downs | Greg Harris | Greg Harris | Kelly Downs | Mark Davis | 699 | 600 | 99 |