| 1989-04-03 | vs LAN | 1 | W 6-4 | 1-0 | 1 | 55,385 | Danny Jackson | Tim Belcher | Danny Jackson | Tim Belcher | John Franco | 6 | 4 | 2 |
| 1989-04-05 | vs LAN | 2 | W 4-3 | 2-0 | 1 | 20,964 | Tom Browning | Orel Hershiser | Tom Browning | Orel Hershiser | John Franco | 10 | 7 | 3 |
| 1989-04-06 | vs LAN | 3 | L 1-4 | 2-1 | 2 | 18,573 | Rick Mahler | Tim Leary | Tim Leary | Rick Mahler | | 11 | 11 | 0 |
| 1989-04-07 | vs SFN | 4 | W 4-3 | 3-1 | 2 | 25,278 | Jose Rijo | Scott Garrelts | Tim Birtsas | Joe Price | | 15 | 14 | 1 |
| 1989-04-09 | vs SFN | 5 | L 1-9 | 3-2 | 2 | 23,152 | Danny Jackson | Rick Reuschel | Rick Reuschel | Danny Jackson | | 16 | 23 | -7 |
| 1989-04-10 | @ HOU | 6 | W 8-3 | 4-2 | 1 | 10,090 | Tom Browning | Bob Knepper | Tom Browning | Bob Knepper | Rob Dibble | 24 | 26 | -2 |
| 1989-04-11 | @ HOU | 7 | L 3-5 | 4-3 | 2 | 22,490 | Rick Mahler | Jim Deshaies | Jim Deshaies | Rick Mahler | Dave Smith | 27 | 31 | -4 |
| 1989-04-12 | @ HOU | 8 | W 3-1 | 5-3 | 1 | 9,723 | Jose Rijo | Rick Rhoden | Rob Dibble | Dave Smith | John Franco | 30 | 32 | -2 |
| 1989-04-14 | @ SDN | 9 | L 5-6 | 5-4 | 2 | 31,894 | Danny Jackson | Eric Show | Eric Show | Danny Jackson | Mark Davis | 35 | 38 | -3 |
| 1989-04-15 | @ SDN | 10 | W 6-3 | 6-4 | 2 | 36,153 | Tom Browning | Bruce Hurst | Norm Charlton | Greg Booker | John Franco | 41 | 41 | 0 |
| 1989-04-16 | @ SDN | 11 | W 5-0 | 7-4 | 2 | 36,774 | Rick Mahler | Ed Whitson | Rick Mahler | Ed Whitson | | 46 | 41 | 5 |
| 1989-04-17 | @ LAN | 12 | W 3-2 | 8-4 | 2 | 32,489 | Jose Rijo | Fernando Valenzuela | Rob Dibble | Jay Howell | John Franco | 49 | 43 | 6 |
| 1989-04-18 | @ LAN | 13 | L 0-6 | 8-5 | 2 | 33,619 | Danny Jackson | Tim Belcher | Tim Belcher | Danny Jackson | | 49 | 49 | 0 |
| 1989-04-19 | @ LAN | 14 | L 0-3 | 8-6 | 2 | 48,295 | Tom Browning | Mike Morgan | Mike Morgan | Tom Browning | Jay Howell | 49 | 52 | -3 |
| 1989-04-21 | vs HOU | 15 | L 0-7 | 8-7 | 2 | 30,828 | Rick Mahler | Jim Deshaies | Jim Deshaies | Rick Mahler | | 49 | 59 | -10 |
| 1989-04-22 | vs HOU | 16 | W 5-4 | 9-7 | 2 | 31,073 | Jose Rijo | Rick Rhoden | Tim Birtsas | Danny Darwin | | 54 | 63 | -9 |
| 1989-04-23 | vs HOU | 17 | L 2-5 | 9-8 | 2 | 21,967 | Danny Jackson | Bob Knepper | Bob Knepper | Danny Jackson | Larry Andersen | 56 | 68 | -12 |
| 1989-04-25 | vs MON | 18 | W 6-1 | 10-8 | 2 | 16,469 | Tom Browning | Dennis Martinez | Tom Browning | Dennis Martinez | | 62 | 69 | -7 |
| 1989-04-26 | vs MON | 19 | W 6-5 | 11-8 | 1 | 19,336 | Rick Mahler | Pascual Perez | Rick Mahler | Pascual Perez | John Franco | 68 | 74 | -6 |
| 1989-04-28 | @ PHI | 20 | W 3-0 | 12-8 | 1 | 23,052 | Jose Rijo | Don Carman | Jose Rijo | Don Carman | John Franco | 71 | 74 | -3 |
| 1989-04-29 | @ PHI | 21 | L 0-8 | 12-9 | 1 | 23,156 | Danny Jackson | Mike Maddux | Mike Maddux | Danny Jackson | | 71 | 82 | -11 |
| 1989-04-30 | @ PHI | 22 | W 5-3 | 13-9 | 1 | 43,605 | Tom Browning | Ken Howell | Rob Dibble | Larry McWilliams | John Franco | 76 | 85 | -9 |
| 1989-05-01 | @ MON | 23 | W 19-6 | 14-9 | 1 | 8,602 | Rick Mahler | Pascual Perez | Rick Mahler | Pascual Perez | | 95 | 91 | 4 |
| 1989-05-02 | @ MON | 24 | L 4-6 | 14-10 | 1 | 10,102 | Jack Armstrong | Randy Johnson | Tim Burke | Kent Tekulve | | 99 | 97 | 2 |
| 1989-05-03 | @ NYN | 25 | W 6-4 | 15-10 | 1 | 27,412 | Jose Rijo | Sid Fernandez | Jose Rijo | Sid Fernandez | John Franco | 105 | 101 | 4 |
| 1989-05-04 | @ NYN | 26 | L 2-3 | 15-11 | 1 | 29,396 | Danny Jackson | Ron Darling | Randy Myers | Rob Dibble | | 107 | 104 | 3 |
| 1989-05-05 | vs PHI | 27 | L 0-7 | 15-12 | 1 | 17,901 | Tom Browning | Ken Howell | Ken Howell | Tom Browning | | 107 | 111 | -4 |
| 1989-05-06 | vs PHI | 28 | W 7-4 | 16-12 | 1 | 21,541 | Rick Mahler | Larry McWilliams | Rick Mahler | Larry McWilliams | John Franco | 114 | 115 | -1 |
| 1989-05-07 | vs PHI | 29 | L 0-5 | 16-13 | 1 | 24,839 | Jack Armstrong | Alex Madrid | Alex Madrid | Jack Armstrong | | 114 | 120 | -6 |
| 1989-05-08 | vs NYN | 30 | W 3-0 | 17-13 | 1 | 20,384 | Jose Rijo | Bob Ojeda | Jose Rijo | Bob Ojeda | John Franco | 117 | 120 | -3 |
| 1989-05-09 | vs NYN | 31 | L 1-3 | 17-14 | 1 | 12,645 | Danny Jackson | Sid Fernandez | Sid Fernandez | Danny Jackson | Randy Myers | 118 | 123 | -5 |
| 1989-05-10 | vs NYN | 32 | L 4-11 | 17-15 | 2 | 19,112 | Tom Browning | Ron Darling | Ron Darling | Tom Browning | Rick Aguilera | 122 | 134 | -12 |
| 1989-05-12 | @ SLN | 33 | W 5-0 | 18-15 | 2 | 50,023 | Rick Mahler | Ted Power | Rick Mahler | Ted Power | | 127 | 134 | -7 |
| 1989-05-13 | @ SLN | 34 | W 3-2 | 19-15 | 1 | 48,121 | Jose Rijo | Cris Carpenter | Jose Rijo | Cris Carpenter | John Franco | 130 | 136 | -6 |
| 1989-05-14 | @ SLN | 35 | W 5-2 | 20-15 | 1 | 43,619 | Danny Jackson | Ken Hill | Danny Jackson | Ken Hill | John Franco | 135 | 138 | -3 |
| 1989-05-15 | vs PIT | 36 | W 6-5 | 21-15 | 1 | 16,030 | Tom Browning | Neal Heaton | Norm Charlton | Jeff Robinson | | 141 | 143 | -2 |
| 1989-05-16 | vs PIT | 37 | L 0-5 | 21-16 | 1 | 22,595 | Rick Mahler | Randy Kramer | Randy Kramer | Rick Mahler | | 141 | 148 | -7 |
| 1989-05-17 | vs PIT | 38 | W 5-4 | 22-16 | 1 | 23,553 | Jose Rijo | John Smiley | John Franco | Bill Landrum | | 146 | 152 | -6 |
| 1989-05-19 | vs CHN | 39 | L 2-8 | 22-17 | 1 | 29,202 | Danny Jackson | Greg Maddux | Greg Maddux | Danny Jackson | | 148 | 160 | -12 |
| 1989-05-20 | vs CHN | 40 | L 3-7 | 22-18 | 1 | 49,175 | Tom Browning | Paul Kilgus | Paul Kilgus | Tom Browning | Pat Perry | 151 | 167 | -16 |
| 1989-05-21 | vs CHN | 41 | W 7-2 | 23-18 | 1 | 34,128 | Rick Mahler | Mike Bielecki | Rick Mahler | Mike Bielecki | | 158 | 169 | -11 |
| 1989-05-23 | vs SLN | 42 | W 6-4 | 24-18 | 1 | 21,872 | Danny Jackson | Matt Kinzer | Danny Jackson | Matt Kinzer | John Franco | 164 | 173 | -9 |
| 1989-05-24 | vs SLN | 43 | W 5-1 | 25-18 | 1 | 21,055 | Tom Browning | Ken Hill | Tom Browning | Ken Hill | | 169 | 174 | -5 |
| 1989-05-26 | @ CHN | 44 | W 10-8 | 26-18 | 1 | 33,583 | Rick Mahler | Paul Kilgus | Rob Dibble | Calvin Schiraldi | | 179 | 182 | -3 |
| 1989-05-27 | @ CHN | 45 | L 3-5 | 26-19 | 1 | 34,546 | Jose Rijo | Rick Sutcliffe | Rick Sutcliffe | Jose Rijo | | 182 | 187 | -5 |
| 1989-05-28 | @ CHN | 46 | L 1-6 | 26-20 | 1 | 37,231 | Danny Jackson | Mike Bielecki | Mike Bielecki | Danny Jackson | | 183 | 193 | -10 |
| 1989-05-29 | @ PIT | 47 | L 3-12 | 26-21 | 2 | 18,602 | Tom Browning | Bob Walk | Bob Walk | Tom Browning | Bob Kipper | 186 | 205 | -19 |
| 1989-05-30 | @ PIT | 48 | L 0-2 | 26-22 | 2 | 14,952 | Rick Mahler | Doug Drabek | Doug Drabek | Rick Mahler | Randy Kramer | 186 | 207 | -21 |
| 1989-05-31 | @ PIT | 49 | W 4-3 | 27-22 | 2 | 22,932 | Jose Rijo | Neal Heaton | Jose Rijo | Neal Heaton | John Franco | 190 | 210 | -20 |
| 1989-06-02 | vs SDN | 50 | W 9-4 | 28-22 | 2 | 29,277 | Tom Browning | Walt Terrell | Tom Browning | Walt Terrell | | 199 | 214 | -15 |
| 1989-06-03 | vs SDN | 51 | W 6-2 | 29-22 | 2 | 35,378 | Rick Mahler | Eric Show | Rick Mahler | Eric Show | | 205 | 216 | -11 |
| 1989-06-04 | vs SDN | 52 | W 5-3 | 30-22 | 1 | 29,005 | Danny Jackson | Bruce Hurst | Danny Jackson | Bruce Hurst | John Franco | 210 | 219 | -9 |
| 1989-06-05 | vs SFN | 53 | L 8-11 | 30-23 | 2 | 20,828 | Jose Rijo | Scott Garrelts | Scott Garrelts | Jose Rijo | | 218 | 230 | -12 |
| 1989-06-06 | vs SFN | 54 | W 4-3 | 31-24 | 2 | 0 | Scott Scudder | Terry Mulholland | John Franco | Mike LaCoss | | 222 | 233 | -11 |
| 1989-06-06 | vs SFN | 55 | L 2-3 | 31-24 | 2 | 28,380 | Tom Browning | Rick Reuschel | Rick Reuschel | Rob Dibble | Craig Lefferts | 224 | 236 | -12 |
| 1989-06-07 | vs SFN | 56 | W 12-5 | 32-24 | 1 | 25,896 | Rick Mahler | Atlee Hammaker | Rick Mahler | Atlee Hammaker | | 236 | 241 | -5 |
| 1989-06-08 | vs SFN | 57 | W 3-2 | 33-24 | 1 | 29,217 | Danny Jackson | Dennis Cook | Rob Dibble | Mike LaCoss | John Franco | 239 | 243 | -4 |
| 1989-06-09 | @ LAN | 58 | W 4-0 | 34-24 | 1 | 46,912 | Jose Rijo | Orel Hershiser | Jose Rijo | Orel Hershiser | | 243 | 243 | 0 |
| 1989-06-10 | @ LAN | 59 | W 5-0 | 35-24 | 1 | 42,207 | Tom Browning | Tim Belcher | Tom Browning | Tim Belcher | | 248 | 243 | 5 |
| 1989-06-11 | @ LAN | 60 | L 1-3 | 35-25 | 2 | 41,032 | Scott Scudder | Tim Leary | Tim Leary | Scott Scudder | Jay Howell | 249 | 246 | 3 |
| 1989-06-12 | @ LAN | 61 | L 2-9 | 35-26 | 3 | 28,161 | Rick Mahler | Mike Morgan | Mike Morgan | Rick Mahler | John Wetteland | 251 | 255 | -4 |
| 1989-06-13 | @ SDN | 62 | W 9-6 | 36-26 | 3 | 16,351 | Danny Jackson | Walt Terrell | Danny Jackson | Walt Terrell | | 260 | 261 | -1 |
| 1989-06-14 | @ SDN | 63 | L 2-4 | 36-27 | 3 | 22,805 | Jose Rijo | Eric Show | Eric Show | Jose Rijo | Mark Davis | 262 | 265 | -3 |
| 1989-06-15 | @ SDN | 64 | L 0-1 | 36-28 | 3 | 20,942 | Tom Browning | Bruce Hurst | Greg Harris | Tim Birtsas | | 262 | 266 | -4 |
| 1989-06-16 | @ SFN | 65 | W 5-4 | 37-28 | 3 | 23,986 | Rick Mahler | Rick Reuschel | Norm Charlton | Rich Gossage | John Franco | 267 | 270 | -3 |
| 1989-06-17 | @ SFN | 66 | L 1-8 | 37-29 | 3 | 34,476 | Danny Jackson | Dennis Cook | Dennis Cook | Danny Jackson | | 268 | 278 | -10 |
| 1989-06-18 | @ SFN | 67 | L 1-2 | 37-30 | 3 | 44,542 | Jose Rijo | Atlee Hammaker | Mike LaCoss | Jose Rijo | Craig Lefferts | 269 | 280 | -11 |
| 1989-06-21 | @ ATL | 68 | L 3-4 | 37-32 | 3 | 0 | Tom Browning | Derek Lilliquist | Mark Eichhorn | John Franco | | 272 | 284 | -12 |
| 1989-06-21 | @ ATL | 69 | L 0-1 | 37-32 | 3 | 10,247 | Rick Mahler | John Smoltz | John Smoltz | Rick Mahler | Joe Boever | 272 | 285 | -13 |
| 1989-06-22 | @ ATL | 70 | W 6-1 | 38-32 | 3 | 10,203 | Scott Scudder | Tom Glavine | Scott Scudder | Tom Glavine | | 278 | 286 | -8 |
| 1989-06-23 | vs LAN | 71 | W 3-1 | 39-32 | 3 | 33,933 | Jose Rijo | Mike Morgan | Jose Rijo | Mike Morgan | John Franco | 281 | 287 | -6 |
| 1989-06-24 | vs LAN | 72 | L 3-10 | 39-33 | 3 | 37,211 | Tim Birtsas | Fernando Valenzuela | Fernando Valenzuela | Tim Birtsas | Tim Belcher | 284 | 297 | -13 |
| 1989-06-25 | vs LAN | 73 | L 0-7 | 39-34 | 3 | 36,063 | Tom Browning | Orel Hershiser | Orel Hershiser | Tom Browning | | 284 | 304 | -20 |
| 1989-06-26 | vs LAN | 74 | W 5-3 | 40-34 | 3 | 23,727 | Rick Mahler | Tim Leary | Rob Dibble | Tim Belcher | John Franco | 289 | 307 | -18 |
| 1989-06-27 | vs ATL | 75 | W 9-3 | 41-34 | 3 | 20,227 | Scott Scudder | John Smoltz | Scott Scudder | John Smoltz | | 298 | 310 | -12 |
| 1989-06-28 | vs ATL | 76 | L 3-4 | 41-35 | 3 | 32,855 | Jose Rijo | Tom Glavine | Tom Glavine | Jose Rijo | Joe Boever | 301 | 314 | -13 |
| 1989-06-29 | vs ATL | 77 | L 1-2 | 41-36 | 3 | 25,614 | Tom Browning | Marty Clary | Marty Clary | Rob Dibble | | 302 | 316 | -14 |
| 1989-06-30 | vs NYN | 78 | L 1-11 | 41-37 | 3 | 33,855 | Rick Mahler | Ron Darling | Ron Darling | Rick Mahler | | 303 | 327 | -24 |
| 1989-07-01 | vs NYN | 79 | W 6-2 | 42-37 | 3 | 32,561 | Jack Armstrong | Dwight Gooden | Jack Armstrong | Dwight Gooden | John Franco | 309 | 329 | -20 |
| 1989-07-02 | vs NYN | 80 | L 2-7 | 42-38 | 3 | 33,910 | Scott Scudder | Sid Fernandez | Sid Fernandez | Scott Scudder | | 311 | 336 | -25 |
| 1989-07-03 | @ PHI | 81 | L 1-2 | 42-39 | 3 | 56,498 | Jose Rijo | Ken Howell | Ken Howell | Jose Rijo | Roger McDowell | 312 | 338 | -26 |
| 1989-07-04 | @ PHI | 82 | W 2-1 | 43-39 | 3 | 14,636 | Tom Browning | Terry Mulholland | Tom Browning | Terry Mulholland | John Franco | 314 | 339 | -25 |
| 1989-07-05 | @ PHI | 83 | L 2-3 | 43-40 | 3 | 11,935 | Rick Mahler | Larry McWilliams | Roger McDowell | John Franco | | 316 | 342 | -26 |
| 1989-07-06 | @ NYN | 84 | W 10-2 | 44-40 | 3 | 47,267 | Danny Jackson | David West | Danny Jackson | David West | Kent Tekulve | 326 | 344 | -18 |
| 1989-07-07 | @ NYN | 85 | L 1-7 | 44-41 | 3 | 40,242 | Scott Scudder | Sid Fernandez | Sid Fernandez | Scott Scudder | | 327 | 351 | -24 |
| 1989-07-08 | @ NYN | 86 | L 3-8 | 44-42 | 3 | 46,789 | Tom Browning | David Cone | David Cone | Tom Browning | | 330 | 359 | -29 |
| 1989-07-09 | @ NYN | 87 | L 3-6 | 44-43 | 3 | 46,357 | Rick Mahler | Bob Ojeda | Rick Aguilera | Norm Charlton | | 333 | 365 | -32 |
| 1989-07-13 | vs MON | 88 | L 3-6 | 44-44 | 3 | 25,483 | Danny Jackson | Dennis Martinez | Dennis Martinez | Kent Tekulve | Tim Burke | 336 | 371 | -35 |
| 1989-07-14 | vs MON | 89 | L 0-1 | 44-45 | 3 | 29,494 | Tom Browning | Bryn Smith | Bryn Smith | Tom Browning | Joe Hesketh | 336 | 372 | -36 |
| 1989-07-15 | vs MON | 90 | W 5-3 | 45-45 | 3 | 34,997 | Rick Mahler | Mark Langston | Rick Mahler | Mark Langston | John Franco | 341 | 375 | -34 |
| 1989-07-16 | vs MON | 91 | L 3-6 | 45-46 | 3 | 28,348 | Jose Rijo | Kevin Gross | Steve Frey | Kent Tekulve | Tim Burke | 344 | 381 | -37 |
| 1989-07-17 | vs PHI | 92 | L 1-4 | 45-47 | 3 | 24,167 | Ron Robinson | Ken Howell | Ken Howell | Ron Robinson | Roger McDowell | 345 | 385 | -40 |
| 1989-07-18 | vs PHI | 93 | L 5-6 | 45-48 | 4 | 19,970 | Danny Jackson | Bruce Ruffin | Todd Frohwirth | Danny Jackson | Roger McDowell | 350 | 391 | -41 |
| 1989-07-19 | vs PHI | 94 | L 4-9 | 45-49 | 4 | 17,739 | Tom Browning | Dennis Cook | Dennis Cook | Tom Browning | | 354 | 400 | -46 |
| 1989-07-20 | @ MON | 95 | L 1-4 | 45-50 | 4 | 24,009 | Rick Mahler | Mark Langston | Mark Langston | Rick Mahler | | 355 | 404 | -49 |
| 1989-07-21 | @ MON | 96 | L 1-3 | 45-51 | 4 | 23,587 | Tim Leary | Kevin Gross | Kevin Gross | Tim Leary | Tim Burke | 356 | 407 | -51 |
| 1989-07-22 | @ MON | 97 | L 5-6 | 45-52 | 4 | 28,278 | Ron Robinson | Pascual Perez | Andy McGaffigan | John Franco | | 361 | 413 | -52 |
| 1989-07-23 | @ MON | 98 | L 4-12 | 45-53 | 5 | 33,217 | Danny Jackson | Dennis Martinez | Dennis Martinez | Danny Jackson | | 365 | 425 | -60 |
| 1989-07-25 | vs SDN | 99 | L 2-6 | 45-54 | 5 | 24,221 | Tom Browning | Ed Whitson | Ed Whitson | Tom Browning | | 367 | 431 | -64 |
| 1989-07-26 | vs SDN | 100 | L 3-5 | 45-55 | 5 | 18,755 | Rick Mahler | Dennis Rasmussen | Mark Grant | John Franco | Mark Davis | 370 | 436 | -66 |
| 1989-07-27 | vs SDN | 101 | W 6-1 | 46-55 | 5 | 18,072 | Tim Leary | Greg Harris | Tim Leary | Greg Harris | | 376 | 437 | -61 |
| 1989-07-28 | @ ATL | 102 | W 4-2 | 47-55 | 5 | 18,883 | Ron Robinson | Pete Smith | Norm Charlton | Sergio Valdez | Bob Sebra | 380 | 439 | -59 |
| 1989-07-29 | @ ATL | 103 | W 4-1 | 48-55 | 4 | 31,470 | Tom Browning | John Smoltz | Tom Browning | John Smoltz | John Franco | 384 | 440 | -56 |
| 1989-07-30 | @ ATL | 104 | L 2-5 | 48-56 | 5 | 14,177 | Rick Mahler | Derek Lilliquist | Derek Lilliquist | Rick Mahler | Joe Boever | 386 | 445 | -59 |
| 1989-08-01 | vs HOU | 105 | L 0-5 | 48-57 | 5 | 20,999 | Tim Leary | Rick Rhoden | Rick Rhoden | Tim Leary | | 386 | 450 | -64 |
| 1989-08-02 | vs HOU | 106 | W 5-2 | 49-57 | 5 | 23,490 | Ron Robinson | Jim Deshaies | Ron Robinson | Jim Deshaies | John Franco | 391 | 452 | -61 |
| 1989-08-03 | vs HOU | 107 | W 18-2 | 50-57 | 5 | 20,179 | Tom Browning | Jim Clancy | Tom Browning | Jim Clancy | | 409 | 454 | -45 |
| 1989-08-04 | vs ATL | 108 | W 5-4 | 51-57 | 5 | 32,531 | Rick Mahler | Pete Smith | John Franco | Joe Boever | | 414 | 458 | -44 |
| 1989-08-05 | vs ATL | 109 | L 1-7 | 51-58 | 5 | 29,882 | Scott Scudder | Derek Lilliquist | Derek Lilliquist | Scott Scudder | | 415 | 465 | -50 |
| 1989-08-06 | vs ATL | 110 | W 3-2 | 52-58 | 5 | 38,077 | Tim Leary | Marty Clary | Norm Charlton | Joe Boever | | 418 | 467 | -49 |
| 1989-08-07 | @ SFN | 111 | W 10-2 | 53-58 | 4 | 23,905 | Ron Robinson | Jeff Brantley | Ron Robinson | Jeff Brantley | Tim Birtsas | 428 | 469 | -41 |
| 1989-08-08 | @ SFN | 112 | W 10-4 | 54-58 | 4 | 20,765 | Tom Browning | Russ Swan | Tom Browning | Russ Swan | | 438 | 473 | -35 |
| 1989-08-09 | @ SFN | 113 | L 1-10 | 54-59 | 4 | 29,441 | Rick Mahler | Don Robinson | Don Robinson | Rick Mahler | | 439 | 483 | -44 |
| 1989-08-10 | @ SFN | 114 | L 3-4 | 54-60 | 4 | 34,810 | Scott Scudder | Dave Dravecky | Dave Dravecky | Scott Scudder | Steve Bedrosian | 442 | 487 | -45 |
| 1989-08-11 | @ HOU | 115 | W 6-1 | 55-60 | 4 | 36,044 | Tim Leary | Rick Rhoden | Tim Leary | Rick Rhoden | Rob Dibble | 448 | 488 | -40 |
| 1989-08-12 | @ HOU | 116 | L 5-6 | 55-61 | 4 | 33,792 | Ron Robinson | Jim Deshaies | Dave Smith | John Franco | | 453 | 494 | -41 |
| 1989-08-13 | @ HOU | 117 | W 5-0 | 56-61 | 4 | 26,825 | Tom Browning | Jim Clancy | Tom Browning | Jim Clancy | | 458 | 494 | -36 |
| 1989-08-15 | vs CHN | 118 | L 2-5 | 56-62 | 4 | 31,694 | Rick Mahler | Greg Maddux | Mitch Williams | Mike Roesler | | 460 | 499 | -39 |
| 1989-08-16 | vs CHN | 119 | L 1-5 | 56-63 | 4 | 29,764 | Tim Leary | Mike Bielecki | Mike Bielecki | Tim Leary | | 461 | 504 | -43 |
| 1989-08-17 | vs CHN | 120 | L 2-3 | 56-64 | 5 | 29,278 | Ron Robinson | Rick Sutcliffe | Rick Sutcliffe | John Franco | Mitch Williams | 463 | 507 | -44 |
| 1989-08-18 | vs SLN | 121 | W 6-2 | 58-64 | 4 | 0 | Tom Browning | Ken Hill | Tom Browning | Ken Hill | | 469 | 509 | -40 |
| 1989-08-18 | vs SLN | 122 | W 8-3 | 58-64 | 4 | 39,351 | Scott Scudder | Ricky Horton | Rob Dibble | Todd Worrell | | 477 | 512 | -35 |
| 1989-08-19 | vs SLN | 123 | L 1-5 | 58-65 | 4 | 33,959 | Rick Mahler | Joe Magrane | Joe Magrane | Rick Mahler | | 478 | 517 | -39 |
| 1989-08-20 | vs SLN | 124 | L 1-8 | 58-66 | 4 | 21,512 | Tim Leary | Jose DeLeon | Jose DeLeon | Tim Leary | | 479 | 525 | -46 |
| 1989-08-21 | @ CHN | 125 | W 6-5 | 59-66 | 4 | 37,626 | Ron Robinson | Rick Sutcliffe | Norm Charlton | Calvin Schiraldi | John Franco | 485 | 530 | -45 |
| 1989-08-22 | @ CHN | 126 | W 7-2 | 60-66 | 4 | 35,179 | Tom Browning | Joe Kraemer | Tom Browning | Joe Kraemer | | 492 | 532 | -40 |
| 1989-08-23 | @ CHN | 127 | W 8-5 | 61-66 | 4 | 33,054 | Scott Scudder | Greg Maddux | Scott Scudder | Greg Maddux | | 500 | 537 | -37 |
| 1989-08-25 | vs PIT | 128 | L 3-12 | 61-67 | 4 | 25,722 | Rick Mahler | Jeff Robinson | Jeff Robinson | Rick Mahler | | 503 | 549 | -46 |
| 1989-08-26 | vs PIT | 129 | W 6-4 | 62-67 | 4 | 26,159 | Ron Robinson | Rick Reed | Ron Robinson | Rick Reed | John Franco | 509 | 553 | -44 |
| 1989-08-27 | vs PIT | 130 | W 1-0 | 63-67 | 4 | 22,413 | Tom Browning | Randy Kramer | Tom Browning | Randy Kramer | John Franco | 510 | 553 | -43 |
| 1989-08-28 | @ SLN | 131 | L 2-3 | 63-68 | 4 | 26,604 | Scott Scudder | Ricky Horton | John Costello | Rob Dibble | Todd Worrell | 512 | 556 | -44 |
| 1989-08-29 | @ SLN | 132 | L 2-4 | 63-69 | 4 | 27,405 | Tim Leary | Joe Magrane | Joe Magrane | Tim Leary | | 514 | 560 | -46 |
| 1989-08-30 | @ SLN | 133 | W 2-0 | 64-69 | 4 | 34,976 | Rick Mahler | Jose DeLeon | Rob Dibble | Todd Worrell | John Franco | 516 | 560 | -44 |
| 1989-09-01 | @ PIT | 134 | W 11-5 | 65-69 | 4 | 15,623 | Ron Robinson | Bob Patterson | Ron Robinson | Bob Patterson | | 527 | 565 | -38 |
| 1989-09-02 | @ PIT | 135 | W 6-2 | 66-69 | 4 | 25,682 | Tom Browning | Bob Walk | Tom Browning | Bob Walk | | 533 | 567 | -34 |
| 1989-09-03 | @ PIT | 136 | L 1-3 | 66-70 | 4 | 24,175 | Scott Scudder | Doug Drabek | Doug Drabek | Scott Scudder | Bill Landrum | 534 | 570 | -36 |
| 1989-09-04 | vs SFN | 137 | L 8-9 | 66-71 | 4 | 15,140 | Tim Leary | Kelly Downs | Ernie Camacho | John Franco | Steve Bedrosian | 542 | 579 | -37 |
| 1989-09-05 | vs SFN | 138 | W 6-5 | 67-71 | 4 | 16,389 | Jack Armstrong | Mike LaCoss | Jack Armstrong | Mike LaCoss | John Franco | 548 | 584 | -36 |
| 1989-09-06 | vs LAN | 139 | W 9-5 | 68-71 | 4 | 14,448 | Ron Robinson | Tim Belcher | Rosario Rodriguez | Ray Searage | | 557 | 589 | -32 |
| 1989-09-07 | vs LAN | 140 | L 2-8 | 68-72 | 4 | 15,044 | Tom Browning | Fernando Valenzuela | Fernando Valenzuela | Tom Browning | | 559 | 597 | -38 |
| 1989-09-08 | vs ATL | 141 | W 5-1 | 69-72 | 4 | 18,044 | Scott Scudder | Pete Smith | Scott Scudder | Pete Smith | | 564 | 598 | -34 |
| 1989-09-09 | vs ATL | 142 | L 1-2 | 69-73 | 4 | 18,082 | Tim Leary | Tom Glavine | Tom Glavine | Tim Leary | Dwayne Henry | 565 | 600 | -35 |
| 1989-09-10 | vs ATL | 143 | W 5-4 | 70-73 | 4 | 12,779 | Jack Armstrong | Tommy Greene | John Franco | Dwayne Henry | | 570 | 604 | -34 |
| 1989-09-11 | @ LAN | 144 | L 2-8 | 70-74 | 4 | 19,699 | Ron Robinson | Tim Belcher | Tim Belcher | Ron Robinson | | 572 | 612 | -40 |
| 1989-09-12 | @ LAN | 145 | L 4-5 | 70-75 | 4 | 22,606 | Tom Browning | Fernando Valenzuela | Jay Howell | Rob Dibble | | 576 | 617 | -41 |
| 1989-09-13 | @ SFN | 146 | L 7-8 | 70-76 | 4 | 13,827 | Scott Scudder | Don Robinson | Ernie Camacho | Rosario Rodriguez | | 583 | 625 | -42 |
| 1989-09-14 | @ SFN | 147 | L 3-4 | 70-77 | 4 | 15,969 | Tim Leary | Mike LaCoss | Ernie Camacho | Norm Charlton | | 586 | 629 | -43 |
| 1989-09-15 | @ HOU | 148 | L 1-4 | 70-78 | 4 | 13,581 | Jack Armstrong | Rick Rhoden | Rick Rhoden | Jack Armstrong | Dave Smith | 587 | 633 | -46 |
| 1989-09-16 | @ HOU | 149 | L 1-3 | 70-79 | 5 | 22,902 | Ron Robinson | Jim Deshaies | Jim Deshaies | Ron Robinson | | 588 | 636 | -48 |
| 1989-09-17 | @ HOU | 150 | L 0-1 | 70-80 | 5 | 17,820 | Tom Browning | Mark Portugal | Mark Portugal | Tom Browning | | 588 | 637 | -49 |
| 1989-09-19 | vs SDN | 151 | L 1-5 | 70-81 | 5 | 20,068 | Scott Scudder | Andy Benes | Andy Benes | Scott Scudder | Mark Davis | 589 | 642 | -53 |
| 1989-09-20 | vs SDN | 152 | L 1-3 | 70-82 | 5 | 11,852 | Tim Leary | Ed Whitson | Greg Harris | Norm Charlton | Mark Davis | 590 | 645 | -55 |
| 1989-09-21 | vs SDN | 153 | L 7-11 | 70-83 | 5 | 12,522 | Jack Armstrong | Dennis Rasmussen | Pat Clements | John Franco | | 597 | 656 | -59 |
| 1989-09-22 | @ ATL | 154 | W 8-3 | 71-83 | 5 | 4,273 | Ron Robinson | Derek Lilliquist | Ron Robinson | Derek Lilliquist | | 605 | 659 | -54 |
| 1989-09-23 | @ ATL | 155 | W 11-5 | 72-83 | 5 | 7,674 | Tom Browning | Marty Clary | Norm Charlton | Jay Aldrich | | 616 | 664 | -48 |
| 1989-09-24 | @ ATL | 156 | L 2-6 | 72-84 | 5 | 4,689 | Scott Scudder | Gary Eave | Gary Eave | Scott Scudder | | 618 | 670 | -52 |
| 1989-09-25 | @ SDN | 157 | W 5-3 | 73-84 | 5 | 34,076 | Tim Leary | Ed Whitson | Rob Dibble | Greg Harris | John Franco | 623 | 673 | -50 |
| 1989-09-26 | @ SDN | 158 | L 1-3 | 73-85 | 5 | 12,535 | Jack Armstrong | Dennis Rasmussen | Dennis Rasmussen | Jack Armstrong | Mark Davis | 624 | 676 | -52 |
| 1989-09-27 | @ SDN | 159 | W 2-1 | 74-85 | 5 | 17,136 | Ron Robinson | Bruce Hurst | Norm Charlton | Calvin Schiraldi | | 626 | 677 | -51 |
| 1989-09-29 | vs HOU | 160 | W 4-3 | 75-85 | 5 | 17,342 | Tom Browning | Rick Rhoden | Rob Dibble | Brian Meyer | John Franco | 630 | 680 | -50 |
| 1989-09-30 | vs HOU | 161 | L 2-9 | 75-86 | 5 | 16,167 | Scott Scudder | Jose Cano | Jose Cano | Scott Scudder | | 632 | 689 | -57 |
| 1989-10-01 | vs HOU | 162 | L 0-2 | 75-87 | 5 | 20,313 | Tim Leary | Jim Deshaies | Jim Deshaies | Tim Leary | | 632 | 691 | -59 |