| 1989-04-03 | @ NYN | 1 | L 4-8 | 0-1 | 6 | 38,539 | Joe Magrane | Dwight Gooden | Dwight Gooden | Joe Magrane | Don Aase | 4 | 8 | -4 |
| 1989-04-05 | @ NYN | 2 | W 3-1 | 1-1 | 6 | 17,873 | Jose DeLeon | Bob Ojeda | Jose DeLeon | Bob Ojeda | Todd Worrell | 7 | 9 | -2 |
| 1989-04-08 | @ PHI | 3 | L 4-5 | 1-2 | 4 | 23,741 | Scott Terry | Don Carman | Jeff Parrett | John Costello | | 11 | 14 | -3 |
| 1989-04-09 | @ PHI | 4 | W 15-3 | 2-2 | 4 | 31,631 | Joe Magrane | Bruce Ruffin | Joe Magrane | Bruce Ruffin | | 26 | 17 | 9 |
| 1989-04-11 | @ CHN | 5 | L 4-5 | 2-3 | 4 | 7,943 | Jose DeLeon | Greg Maddux | Calvin Schiraldi | Jose DeLeon | Mitch Williams | 30 | 22 | 8 |
| 1989-04-12 | @ CHN | 6 | L 2-3 | 2-4 | 5 | 21,187 | Scott Terry | Paul Kilgus | Paul Kilgus | Scott Terry | Mitch Williams | 32 | 25 | 7 |
| 1989-04-14 | vs NYN | 7 | L 4-9 | 2-5 | 6 | 51,257 | Joe Magrane | David Cone | David Cone | Joe Magrane | | 36 | 34 | 2 |
| 1989-04-15 | vs NYN | 8 | W 3-2 | 3-5 | 5 | 40,477 | Don Heinkel | Dwight Gooden | Dan Quisenberry | Don Aase | | 39 | 36 | 3 |
| 1989-04-16 | vs NYN | 9 | W 5-3 | 4-5 | 4 | 40,168 | Jose DeLeon | Bob Ojeda | Jose DeLeon | Bob Ojeda | | 44 | 39 | 5 |
| 1989-04-17 | vs PIT | 10 | W 4-2 | 5-5 | 4 | 25,277 | Scott Terry | Neal Heaton | Scott Terry | Brian Fisher | Todd Worrell | 48 | 41 | 7 |
| 1989-04-18 | vs PIT | 11 | L 3-4 | 5-6 | 4 | 22,198 | Cris Carpenter | John Smiley | Morris Madden | Todd Worrell | Jeff Robinson | 51 | 45 | 6 |
| 1989-04-19 | vs PIT | 12 | L 5-7 | 5-7 | 5 | 29,132 | Don Heinkel | Bob Walk | Bob Walk | Don Heinkel | Jeff Robinson | 56 | 52 | 4 |
| 1989-04-20 | vs MON | 13 | W 5-2 | 6-7 | 4 | 22,839 | Ken Hill | Randy Johnson | Ken Hill | Randy Johnson | Todd Worrell | 61 | 54 | 7 |
| 1989-04-21 | vs MON | 14 | W 1-0 | 7-7 | 4 | 32,227 | Jose DeLeon | Pascual Perez | Jose DeLeon | Tim Burke | | 62 | 54 | 8 |
| 1989-04-22 | vs MON | 15 | W 5-2 | 8-7 | 3 | 41,325 | Scott Terry | Kevin Gross | Scott Terry | Kevin Gross | | 67 | 56 | 11 |
| 1989-04-23 | vs MON | 16 | L 3-9 | 8-8 | 4 | 44,956 | Cris Carpenter | Bryn Smith | Bryn Smith | Cris Carpenter | | 70 | 65 | 5 |
| 1989-04-25 | vs SFN | 17 | L 0-4 | 8-9 | 5 | 27,911 | Ken Hill | Don Robinson | Don Robinson | Ken Hill | Craig Lefferts | 70 | 69 | 1 |
| 1989-04-26 | vs SFN | 18 | W 3-1 | 9-9 | 3 | 27,514 | Jose DeLeon | Kelly Downs | Jose DeLeon | Kelly Downs | Ken Dayley | 73 | 70 | 3 |
| 1989-04-27 | vs SFN | 19 | W 10-1 | 10-9 | 2 | 30,825 | Scott Terry | Scott Garrelts | Scott Terry | Scott Garrelts | | 83 | 71 | 12 |
| 1989-04-28 | vs LAN | 20 | W 6-3 | 11-9 | 2 | 39,918 | Don Heinkel | Tim Leary | Don Heinkel | Tim Leary | | 89 | 74 | 15 |
| 1989-04-29 | vs LAN | 21 | W 1-0 | 12-9 | 2 | 40,282 | Ken Hill | Fernando Valenzuela | Cris Carpenter | Ray Searage | | 90 | 74 | 16 |
| 1989-04-30 | vs LAN | 22 | W 4-3 | 13-9 | 1 | 48,726 | Joe Magrane | Tim Belcher | Joe Magrane | Tim Belcher | Ken Dayley | 94 | 77 | 17 |
| 1989-05-01 | @ SDN | 23 | W 6-0 | 14-9 | 1 | 32,486 | Jose DeLeon | Bruce Hurst | Jose DeLeon | Bruce Hurst | | 100 | 77 | 23 |
| 1989-05-02 | @ SDN | 24 | L 1-7 | 14-10 | 2 | 20,920 | Scott Terry | Ed Whitson | Ed Whitson | Scott Terry | | 101 | 84 | 17 |
| 1989-05-03 | @ LAN | 25 | L 3-4 | 14-11 | 2 | 34,861 | Don Heinkel | Tim Leary | Ray Searage | Ken Dayley | | 104 | 88 | 16 |
| 1989-05-04 | @ LAN | 26 | W 12-0 | 15-11 | 2 | 36,689 | Ken Hill | Fernando Valenzuela | Ken Hill | Fernando Valenzuela | | 116 | 88 | 28 |
| 1989-05-05 | @ SFN | 27 | W 3-1 | 16-11 | 1 | 24,401 | Joe Magrane | Scott Garrelts | Frank DiPino | Mike LaCoss | Todd Worrell | 119 | 89 | 30 |
| 1989-05-06 | @ SFN | 28 | L 0-9 | 16-12 | 2 | 26,925 | Jose DeLeon | Rick Reuschel | Rick Reuschel | Jose DeLeon | Mike LaCoss | 119 | 98 | 21 |
| 1989-05-07 | @ SFN | 29 | L 1-5 | 16-13 | 3 | 50,492 | Scott Terry | Don Robinson | Don Robinson | Scott Terry | | 120 | 103 | 17 |
| 1989-05-09 | vs SDN | 30 | W 4-3 | 17-13 | 2 | 35,809 | Ken Hill | Dennis Rasmussen | Ken Dayley | Greg Harris | Todd Worrell | 124 | 106 | 18 |
| 1989-05-10 | vs SDN | 31 | W 3-1 | 18-13 | 2 | 34,996 | Joe Magrane | Walt Terrell | Joe Magrane | Walt Terrell | Todd Worrell | 127 | 107 | 20 |
| 1989-05-11 | vs SDN | 32 | W 6-5 | 19-13 | 1 | 40,146 | Jose DeLeon | Eric Show | Jose DeLeon | Eric Show | Dan Quisenberry | 133 | 112 | 21 |
| 1989-05-12 | vs CIN | 33 | L 0-5 | 19-14 | 1 | 50,023 | Ted Power | Rick Mahler | Rick Mahler | Ted Power | | 133 | 117 | 16 |
| 1989-05-13 | vs CIN | 34 | L 2-3 | 19-15 | 2 | 48,121 | Cris Carpenter | Jose Rijo | Jose Rijo | Cris Carpenter | John Franco | 135 | 120 | 15 |
| 1989-05-14 | vs CIN | 35 | L 2-5 | 19-16 | 2 | 43,619 | Ken Hill | Danny Jackson | Danny Jackson | Ken Hill | John Franco | 137 | 125 | 12 |
| 1989-05-16 | @ HOU | 36 | L 7-8 | 19-17 | 2 | 12,685 | Jose DeLeon | Jim Clancy | Dan Schatzeder | Cris Carpenter | | 144 | 133 | 11 |
| 1989-05-17 | @ HOU | 37 | L 2-3 | 19-18 | 3 | 11,605 | Joe Magrane | Jim Deshaies | Larry Andersen | Joe Magrane | | 146 | 136 | 10 |
| 1989-05-18 | @ HOU | 38 | W 4-3 | 20-18 | 3 | 17,124 | Don Heinkel | Bob Knepper | Ken Dayley | Larry Andersen | | 150 | 139 | 11 |
| 1989-05-19 | @ ATL | 39 | L 2-3 | 20-19 | 3 | 18,594 | Ken Hill | Pete Smith | Joe Boever | Dan Quisenberry | | 152 | 142 | 10 |
| 1989-05-20 | @ ATL | 40 | W 1-0 | 21-19 | 3 | 26,840 | Scott Terry | Derek Lilliquist | Ken Dayley | Joe Boever | Dan Quisenberry | 153 | 142 | 11 |
| 1989-05-21 | @ ATL | 41 | W 6-1 | 22-19 | 3 | 36,560 | Jose DeLeon | John Smoltz | Frank DiPino | Jose Alvarez | | 159 | 143 | 16 |
| 1989-05-23 | @ CIN | 42 | L 4-6 | 22-20 | 3 | 21,872 | Matt Kinzer | Danny Jackson | Danny Jackson | Matt Kinzer | John Franco | 163 | 149 | 14 |
| 1989-05-24 | @ CIN | 43 | L 1-5 | 22-21 | 3 | 21,055 | Ken Hill | Tom Browning | Tom Browning | Ken Hill | | 164 | 154 | 10 |
| 1989-05-26 | vs ATL | 44 | W 3-0 | 23-21 | 3 | 34,818 | Scott Terry | John Smoltz | Scott Terry | John Smoltz | Dan Quisenberry | 167 | 154 | 13 |
| 1989-05-27 | vs ATL | 45 | L 1-4 | 23-22 | 3 | 48,866 | Jose DeLeon | Tom Glavine | Jose Alvarez | Jose DeLeon | Joe Boever | 168 | 158 | 10 |
| 1989-05-28 | vs ATL | 46 | W 3-3 | 24-22 | 3 | 35,832 | Joe Magrane | Zane Smith | | | | 171 | 161 | 10 |
| 1989-05-29 | vs HOU | 47 | L 2-3 | 24-23 | 4 | 30,012 | Ken Hill | Bob Knepper | Bob Knepper | Ken Hill | Dave Smith | 173 | 164 | 9 |
| 1989-05-30 | vs HOU | 48 | L 4-8 | 24-24 | 4 | 36,370 | Scott Terry | Bob Forsch | Danny Darwin | Scott Terry | | 177 | 172 | 5 |
| 1989-05-31 | vs HOU | 49 | L 3-4 | 24-25 | 4 | 34,258 | Jose DeLeon | Jim Clancy | Dan Schatzeder | Cris Carpenter | Dave Smith | 180 | 176 | 4 |
| 1989-06-02 | vs CHN | 50 | L 2-5 | 24-26 | 4 | 46,448 | Joe Magrane | Rick Sutcliffe | Rick Sutcliffe | Joe Magrane | Mitch Williams | 182 | 181 | 1 |
| 1989-06-03 | vs CHN | 51 | W 6-5 | 25-26 | 4 | 44,719 | Ken Hill | Mike Bielecki | Dan Quisenberry | Calvin Schiraldi | | 188 | 186 | 2 |
| 1989-06-04 | vs CHN | 52 | L 3-11 | 25-27 | 4 | 45,659 | Scott Terry | Scott Sanderson | Scott Sanderson | Scott Terry | | 191 | 197 | -6 |
| 1989-06-05 | @ MON | 53 | W 5-4 | 26-27 | 4 | 17,261 | Jose DeLeon | Bryn Smith | Jose DeLeon | Bryn Smith | John Costello | 196 | 201 | -5 |
| 1989-06-06 | @ MON | 54 | L 2-3 | 26-28 | 4 | 16,435 | Joe Magrane | Pascual Perez | Pascual Perez | Joe Magrane | Tim Burke | 198 | 204 | -6 |
| 1989-06-07 | @ MON | 55 | W 5-2 | 27-28 | 4 | 30,214 | Ken Hill | Mark Langston | Ken Hill | Mark Langston | Ken Dayley | 203 | 206 | -3 |
| 1989-06-08 | @ MON | 56 | W 7-2 | 28-28 | 4 | 12,402 | Scott Terry | Kevin Gross | Frank DiPino | Kevin Gross | | 210 | 208 | 2 |
| 1989-06-09 | @ CHN | 57 | W 1-0 | 29-28 | 4 | 34,937 | Jose DeLeon | Scott Sanderson | Jose DeLeon | Scott Sanderson | Todd Worrell | 211 | 208 | 3 |
| 1989-06-10 | @ CHN | 58 | W 6-0 | 30-28 | 3 | 38,045 | Joe Magrane | Greg Maddux | Joe Magrane | Greg Maddux | | 217 | 208 | 9 |
| 1989-06-11 | @ CHN | 59 | W 10-7 | 31-28 | 3 | 35,450 | Ken Hill | Paul Kilgus | Cris Carpenter | Calvin Schiraldi | | 227 | 215 | 12 |
| 1989-06-12 | @ CHN | 60 | L 3-10 | 31-29 | 3 | 27,154 | Scott Terry | Steve Wilson | Steve Wilson | Scott Terry | | 230 | 225 | 5 |
| 1989-06-13 | vs MON | 61 | L 0-2 | 31-30 | 3 | 35,828 | Jose DeLeon | Mark Langston | Mark Langston | Jose DeLeon | | 230 | 227 | 3 |
| 1989-06-14 | vs MON | 62 | W 10-0 | 32-30 | 3 | 36,246 | Joe Magrane | Kevin Gross | Joe Magrane | Kevin Gross | | 240 | 227 | 13 |
| 1989-06-15 | vs MON | 63 | W 4-3 | 33-30 | 3 | 26,698 | Ken Hill | Dennis Martinez | Todd Worrell | Andy McGaffigan | | 244 | 230 | 14 |
| 1989-06-16 | vs PIT | 64 | W 6-2 | 34-30 | 3 | 47,186 | Scott Terry | Randy Kramer | Scott Terry | Randy Kramer | Ken Dayley | 250 | 232 | 18 |
| 1989-06-17 | vs PIT | 65 | L 2-7 | 34-31 | 4 | 43,924 | Jose DeLeon | Jeff Robinson | Jeff Robinson | Jose DeLeon | Bob Kipper | 252 | 239 | 13 |
| 1989-06-18 | vs PIT | 66 | L 4-12 | 34-32 | 4 | 40,198 | Joe Magrane | Morris Madden | Morris Madden | Joe Magrane | Bill Landrum | 256 | 251 | 5 |
| 1989-06-20 | @ PHI | 67 | W 6-4 | 36-32 | 2 | 0 | Ken Hill | Terry Mulholland | Ken Hill | Terry Mulholland | Ken Dayley | 262 | 255 | 7 |
| 1989-06-20 | @ PHI | 68 | W 5-3 | 36-32 | 2 | 27,285 | Ted Power | Steve Ontiveros | Frank DiPino | Steve Ontiveros | Todd Worrell | 267 | 258 | 9 |
| 1989-06-22 | @ PHI | 69 | L 2-11 | 36-33 | 3 | 26,006 | Jose DeLeon | Dennis Cook | Dennis Cook | Jose DeLeon | | 269 | 269 | 0 |
| 1989-06-23 | @ PIT | 70 | W 3-2 | 37-33 | 3 | 22,904 | Joe Magrane | Morris Madden | Joe Magrane | Morris Madden | Todd Worrell | 272 | 271 | 1 |
| 1989-06-24 | @ PIT | 71 | L 2-5 | 37-34 | 4 | 36,064 | Scott Terry | Bob Walk | Bob Walk | Scott Terry | Bill Landrum | 274 | 276 | -2 |
| 1989-06-25 | @ PIT | 72 | L 3-5 | 37-35 | 4 | 22,514 | Ted Power | John Smiley | John Smiley | Ted Power | Bill Landrum | 277 | 281 | -4 |
| 1989-06-26 | vs PHI | 73 | L 4-5 | 37-36 | 4 | 32,723 | Ken Hill | Bruce Ruffin | Jeff Parrett | Todd Worrell | Roger McDowell | 281 | 286 | -5 |
| 1989-06-27 | vs PHI | 74 | L 2-4 | 37-37 | 4 | 30,482 | Jose DeLeon | Dennis Cook | Dennis Cook | Jose DeLeon | Roger McDowell | 283 | 290 | -7 |
| 1989-06-28 | vs PHI | 75 | W 2-1 | 38-37 | 4 | 37,018 | Joe Magrane | Ken Howell | Joe Magrane | Ken Howell | | 285 | 291 | -6 |
| 1989-06-30 | vs SDN | 76 | W 4-3 | 39-37 | 4 | 48,145 | Scott Terry | Walt Terrell | Scott Terry | Walt Terrell | Todd Worrell | 289 | 294 | -5 |
| 1989-07-01 | vs SDN | 77 | W 9-3 | 40-37 | 4 | 42,270 | Ken Hill | Pat Clements | Ted Power | Pat Clements | | 298 | 297 | 1 |
| 1989-07-02 | vs SDN | 78 | L 2-5 | 40-38 | 4 | 34,248 | Jose DeLeon | Bruce Hurst | Bruce Hurst | Jose DeLeon | | 300 | 302 | -2 |
| 1989-07-04 | vs LAN | 79 | W 2-1 | 41-38 | 4 | 35,532 | Joe Magrane | Fernando Valenzuela | Joe Magrane | Fernando Valenzuela | | 302 | 303 | -1 |
| 1989-07-05 | vs LAN | 80 | W 3-2 | 42-38 | 4 | 34,495 | Scott Terry | Orel Hershiser | John Costello | John Wetteland | Todd Worrell | 305 | 305 | 0 |
| 1989-07-06 | vs LAN | 81 | W 14-2 | 43-38 | 3 | 36,804 | Ken Hill | Tim Leary | Ken Hill | Tim Leary | Dan Quisenberry | 319 | 307 | 12 |
| 1989-07-07 | vs SFN | 82 | W 6-4 | 44-38 | 3 | 42,627 | Jose DeLeon | Mike LaCoss | Frank DiPino | Mike LaCoss | Ken Dayley | 325 | 311 | 14 |
| 1989-07-08 | vs SFN | 83 | L 5-8 | 44-39 | 4 | 47,400 | Ted Power | Don Robinson | Jeff Brantley | Ted Power | | 330 | 319 | 11 |
| 1989-07-09 | vs SFN | 84 | W 6-4 | 45-39 | 4 | 41,985 | Joe Magrane | Trevor Wilson | Joe Magrane | Trevor Wilson | Ken Dayley | 336 | 323 | 13 |
| 1989-07-13 | @ LAN | 85 | L 2-3 | 45-40 | 4 | 33,358 | Ken Hill | Orel Hershiser | Orel Hershiser | Ken Hill | Jay Howell | 338 | 326 | 12 |
| 1989-07-14 | @ LAN | 86 | W 7-2 | 46-40 | 4 | 41,599 | Scott Terry | Mike Morgan | Scott Terry | Mike Morgan | | 345 | 328 | 17 |
| 1989-07-15 | @ LAN | 87 | W 2-0 | 47-40 | 3 | 45,517 | Joe Magrane | Fernando Valenzuela | Joe Magrane | Fernando Valenzuela | | 347 | 328 | 19 |
| 1989-07-16 | @ LAN | 88 | L 2-3 | 47-41 | 3 | 43,655 | Jose DeLeon | Tim Belcher | Tim Belcher | Jose DeLeon | Jay Howell | 349 | 331 | 18 |
| 1989-07-17 | @ SFN | 89 | L 4-8 | 47-42 | 3 | 25,643 | Ted Power | Atlee Hammaker | Randy McCament | Ted Power | Rich Gossage | 353 | 339 | 14 |
| 1989-07-18 | @ SFN | 90 | L 3-7 | 47-43 | 4 | 18,112 | Ken Hill | Don Robinson | Don Robinson | Ken Hill | | 356 | 346 | 10 |
| 1989-07-19 | @ SFN | 91 | L 5-7 | 47-44 | 4 | 38,282 | Scott Terry | Trevor Wilson | Jeff Brantley | Scott Terry | Craig Lefferts | 361 | 353 | 8 |
| 1989-07-20 | @ SDN | 92 | W 7-1 | 48-44 | 4 | 23,713 | Joe Magrane | Walt Terrell | Joe Magrane | Walt Terrell | | 368 | 354 | 14 |
| 1989-07-21 | @ SDN | 93 | W 5-0 | 49-44 | 4 | 19,241 | Jose DeLeon | Dennis Rasmussen | Jose DeLeon | Dennis Rasmussen | | 373 | 354 | 19 |
| 1989-07-22 | @ SDN | 94 | W 5-2 | 50-44 | 4 | 27,567 | Ted Power | Greg Harris | Ted Power | Greg Harris | | 378 | 356 | 22 |
| 1989-07-23 | @ SDN | 95 | W 3-2 | 51-44 | 4 | 20,625 | Ken Hill | Bruce Hurst | Ken Hill | Bruce Hurst | Todd Worrell | 381 | 358 | 23 |
| 1989-07-24 | vs CHN | 96 | L 2-3 | 51-45 | 4 | 45,183 | Scott Terry | Mike Bielecki | Mike Bielecki | Scott Terry | Mitch Williams | 383 | 361 | 22 |
| 1989-07-25 | vs CHN | 97 | L 2-4 | 51-46 | 4 | 46,621 | Joe Magrane | Paul Kilgus | Paul Kilgus | Joe Magrane | Mitch Williams | 385 | 365 | 20 |
| 1989-07-26 | vs CHN | 98 | W 2-0 | 52-46 | 4 | 43,000 | Jose DeLeon | Rick Sutcliffe | Jose DeLeon | Rick Sutcliffe | Todd Worrell | 387 | 365 | 22 |
| 1989-07-28 | @ MON | 99 | W 2-0 | 53-46 | 3 | 41,722 | Ted Power | Pascual Perez | Ted Power | Pascual Perez | Todd Worrell | 389 | 365 | 24 |
| 1989-07-29 | @ MON | 100 | L 0-2 | 53-47 | 3 | 33,886 | Ken Hill | Dennis Martinez | Dennis Martinez | Ken Hill | | 389 | 367 | 22 |
| 1989-07-30 | @ MON | 101 | W 8-3 | 54-47 | 3 | 42,591 | Joe Magrane | Bryn Smith | Joe Magrane | Bryn Smith | | 397 | 370 | 27 |
| 1989-07-31 | vs NYN | 102 | W 3-2 | 55-47 | 3 | 39,657 | Jose DeLeon | Ron Darling | Jose DeLeon | Ron Darling | Todd Worrell | 400 | 372 | 28 |
| 1989-08-01 | vs NYN | 103 | L 0-11 | 55-48 | 3 | 40,444 | Scott Terry | Sid Fernandez | Sid Fernandez | Scott Terry | | 400 | 383 | 17 |
| 1989-08-02 | vs NYN | 104 | L 3-4 | 55-49 | 3 | 41,438 | Ted Power | Frank Viola | Frank Viola | Todd Worrell | Randy Myers | 403 | 387 | 16 |
| 1989-08-03 | vs NYN | 105 | W 6-5 | 56-49 | 3 | 44,496 | Ken Hill | David Cone | Dan Quisenberry | Jeff Musselman | Ken Dayley | 409 | 392 | 17 |
| 1989-08-04 | vs PHI | 106 | W 6-3 | 57-49 | 3 | 44,149 | Joe Magrane | Dennis Cook | Joe Magrane | Dennis Cook | Todd Worrell | 415 | 395 | 20 |
| 1989-08-05 | vs PHI | 107 | L 3-7 | 57-50 | 3 | 46,504 | Jose DeLeon | Terry Mulholland | Terry Mulholland | Jose DeLeon | Jeff Parrett | 418 | 402 | 16 |
| 1989-08-06 | vs PHI | 108 | W 5-4 | 58-50 | 3 | 38,736 | Scott Terry | Don Carman | Todd Worrell | Jeff Parrett | | 423 | 406 | 17 |
| 1989-08-07 | @ PIT | 109 | W 4-0 | 59-50 | 3 | 11,772 | Ted Power | Rick Reed | Ted Power | Rick Reed | | 427 | 406 | 21 |
| 1989-08-08 | @ PIT | 110 | L 3-7 | 59-51 | 3 | 13,884 | Ken Hill | Bob Walk | Bob Walk | Ken Hill | | 430 | 413 | 17 |
| 1989-08-09 | @ PIT | 111 | W 5-2 | 60-51 | 3 | 15,046 | Joe Magrane | Doug Drabek | Joe Magrane | Doug Drabek | | 435 | 415 | 20 |
| 1989-08-10 | @ NYN | 112 | L 1-5 | 60-53 | 4 | 0 | Jose DeLeon | Ron Darling | Ron Darling | Jose DeLeon | | 436 | 420 | 16 |
| 1989-08-10 | @ NYN | 113 | L 4-6 | 60-53 | 4 | 48,712 | Ricky Horton | Sid Fernandez | Jeff Musselman | John Costello | Randy Myers | 440 | 426 | 14 |
| 1989-08-11 | @ NYN | 114 | W 3-0 | 61-53 | 4 | 24,882 | Scott Terry | Frank Viola | Scott Terry | Frank Viola | Ken Dayley | 443 | 426 | 17 |
| 1989-08-12 | @ NYN | 115 | L 1-3 | 61-54 | 4 | 35,414 | Ted Power | David Cone | David Cone | Ted Power | Randy Myers | 444 | 429 | 15 |
| 1989-08-13 | @ NYN | 116 | L 2-3 | 61-55 | 4 | 39,341 | Ken Hill | Bob Ojeda | Bob Ojeda | Ken Hill | Randy Myers | 446 | 432 | 14 |
| 1989-08-14 | vs ATL | 117 | W 7-4 | 63-55 | 4 | 0 | Joe Magrane | John Smoltz | Joe Magrane | John Smoltz | Todd Worrell | 453 | 436 | 17 |
| 1989-08-14 | vs ATL | 118 | W 5-2 | 63-55 | 4 | 39,186 | Ricky Horton | Pete Smith | John Costello | Pete Smith | Ken Dayley | 458 | 438 | 20 |
| 1989-08-15 | vs ATL | 119 | W 9-1 | 64-55 | 4 | 39,970 | Jose DeLeon | Derek Lilliquist | Jose DeLeon | Derek Lilliquist | | 467 | 439 | 28 |
| 1989-08-16 | vs ATL | 120 | W 3-2 | 65-55 | 4 | 42,989 | Ted Power | Marty Clary | Frank DiPino | Jim Acker | Todd Worrell | 470 | 441 | 29 |
| 1989-08-18 | @ CIN | 121 | L 2-6 | 65-57 | 4 | 0 | Ken Hill | Tom Browning | Tom Browning | Ken Hill | | 472 | 447 | 25 |
| 1989-08-18 | @ CIN | 122 | L 3-8 | 65-57 | 4 | 39,351 | Ricky Horton | Scott Scudder | Rob Dibble | Todd Worrell | | 475 | 455 | 20 |
| 1989-08-19 | @ CIN | 123 | W 5-1 | 66-57 | 4 | 33,959 | Joe Magrane | Rick Mahler | Joe Magrane | Rick Mahler | | 480 | 456 | 24 |
| 1989-08-20 | @ CIN | 124 | W 8-1 | 67-57 | 4 | 21,512 | Jose DeLeon | Tim Leary | Jose DeLeon | Tim Leary | | 488 | 457 | 31 |
| 1989-08-22 | @ ATL | 125 | W 10-5 | 68-57 | 4 | 9,117 | Ted Power | Derek Lilliquist | Ted Power | Derek Lilliquist | | 498 | 462 | 36 |
| 1989-08-23 | @ ATL | 126 | L 0-3 | 68-58 | 4 | 7,792 | Ricky Horton | Marty Clary | Marty Clary | Ricky Horton | | 498 | 465 | 33 |
| 1989-08-24 | @ ATL | 127 | W 4-1 | 69-58 | 4 | 8,174 | Joe Magrane | Tom Glavine | Joe Magrane | Tom Glavine | | 502 | 466 | 36 |
| 1989-08-25 | @ HOU | 128 | W 7-4 | 70-58 | 3 | 25,148 | Jose DeLeon | Mike Scott | Jose DeLeon | Mike Scott | | 509 | 470 | 39 |
| 1989-08-26 | @ HOU | 129 | W 5-3 | 71-58 | 2 | 31,301 | Ken Hill | Rick Rhoden | Ken Hill | Rick Rhoden | Todd Worrell | 514 | 473 | 41 |
| 1989-08-27 | @ HOU | 130 | L 3-6 | 71-59 | 3 | 20,697 | Ted Power | Bob Forsch | Bob Forsch | Ted Power | Dave Smith | 517 | 479 | 38 |
| 1989-08-28 | vs CIN | 131 | W 3-2 | 72-59 | 2 | 26,604 | Ricky Horton | Scott Scudder | John Costello | Rob Dibble | Todd Worrell | 520 | 481 | 39 |
| 1989-08-29 | vs CIN | 132 | W 4-2 | 73-59 | 2 | 27,405 | Joe Magrane | Tim Leary | Joe Magrane | Tim Leary | | 524 | 483 | 41 |
| 1989-08-30 | vs CIN | 133 | L 0-2 | 73-60 | 2 | 34,976 | Jose DeLeon | Rick Mahler | Rob Dibble | Todd Worrell | John Franco | 524 | 485 | 39 |
| 1989-09-01 | vs HOU | 134 | L 3-6 | 73-61 | 2 | 33,086 | Ken Hill | Jim Deshaies | Jim Deshaies | John Costello | | 527 | 491 | 36 |
| 1989-09-02 | vs HOU | 135 | W 13-5 | 74-61 | 2 | 47,580 | Ted Power | Bob Forsch | Ted Power | Bob Forsch | | 540 | 496 | 44 |
| 1989-09-03 | vs HOU | 136 | W 4-3 | 75-61 | 2 | 41,181 | Joe Magrane | Mark Portugal | Todd Worrell | Danny Darwin | | 544 | 499 | 45 |
| 1989-09-04 | vs MON | 137 | W 4-1 | 76-61 | 2 | 42,610 | Jose DeLeon | Dennis Martinez | Jose DeLeon | Dennis Martinez | Dan Quisenberry | 548 | 500 | 48 |
| 1989-09-05 | vs MON | 138 | L 2-6 | 76-62 | 2 | 24,788 | Ken Hill | Pascual Perez | Pascual Perez | Ken Hill | | 550 | 506 | 44 |
| 1989-09-06 | @ NYN | 139 | W 3-2 | 77-62 | 2 | 38,283 | Ricky Horton | Ron Darling | Frank DiPino | Ron Darling | Ken Dayley | 553 | 508 | 45 |
| 1989-09-07 | @ NYN | 140 | L 1-13 | 77-63 | 2 | 23,354 | Ted Power | Frank Viola | Frank Viola | Ted Power | | 554 | 521 | 33 |
| 1989-09-08 | @ CHN | 141 | W 11-8 | 78-63 | 2 | 35,231 | Joe Magrane | Paul Kilgus | Cris Carpenter | Mitch Williams | Dan Quisenberry | 565 | 529 | 36 |
| 1989-09-09 | @ CHN | 142 | L 2-3 | 78-64 | 2 | 37,633 | Jose DeLeon | Rick Sutcliffe | Paul Assenmacher | Ken Dayley | | 567 | 532 | 35 |
| 1989-09-10 | @ CHN | 143 | L 1-4 | 78-65 | 2 | 37,281 | Ken Hill | Steve Wilson | Scott Sanderson | Ken Hill | Mitch Williams | 568 | 536 | 32 |
| 1989-09-11 | vs PIT | 144 | L 1-3 | 78-66 | 2 | 25,642 | Ricky Horton | Neal Heaton | Neal Heaton | Ricky Horton | Doug Bair | 569 | 539 | 30 |
| 1989-09-12 | vs PIT | 145 | L 2-5 | 78-67 | 2 | 25,370 | Joe Magrane | Bob Walk | Bob Walk | Joe Magrane | | 571 | 544 | 27 |
| 1989-09-13 | vs PIT | 146 | W 0-0 | 79-67 | 2 | 28,561 | Jose DeLeon | Doug Drabek | | | | 571 | 544 | 27 |
| 1989-09-14 | vs PIT | 147 | L 3-4 | 79-68 | 2 | 1,519 | Bob Tewksbury | Jeff Robinson | Bob Patterson | Ken Dayley | Bob Kipper | 574 | 548 | 26 |
| 1989-09-15 | @ PHI | 148 | L 0-2 | 80-69 | 2 | 0 | Ken Hill | Pat Combs | Pat Combs | Ken Hill | | 574 | 550 | 24 |
| 1989-09-15 | @ PHI | 149 | W 7-6 | 80-69 | 2 | 22,579 | Scott Terry | Terry Mulholland | John Costello | Roger McDowell | | 581 | 556 | 25 |
| 1989-09-17 | @ PHI | 150 | L 5-9 | 81-70 | 2 | 0 | Joe Magrane | Don Carman | Dennis Cook | Matt Kinzer | | 586 | 565 | 21 |
| 1989-09-17 | @ PHI | 151 | W 2-0 | 81-70 | 2 | 23,043 | Cris Carpenter | Ken Howell | Cris Carpenter | Ken Howell | John Costello | 588 | 565 | 23 |
| 1989-09-18 | @ MON | 152 | W 3-2 | 82-70 | 2 | 14,644 | Jose DeLeon | Bryn Smith | Jose DeLeon | Bryn Smith | Scott Terry | 591 | 567 | 24 |
| 1989-09-19 | @ MON | 153 | W 5-0 | 83-70 | 2 | 8,740 | Bob Tewksbury | Mark Gardner | Bob Tewksbury | Mark Gardner | | 596 | 567 | 29 |
| 1989-09-20 | vs NYN | 154 | W 5-3 | 84-70 | 2 | 35,884 | Ken Hill | David Cone | Frank DiPino | David Cone | Ken Dayley | 601 | 570 | 31 |
| 1989-09-21 | vs NYN | 155 | L 1-6 | 84-71 | 2 | 36,600 | Ricky Horton | Sid Fernandez | Sid Fernandez | Ricky Horton | | 602 | 576 | 26 |
| 1989-09-22 | vs PHI | 156 | W 2-1 | 85-71 | 2 | 45,685 | Joe Magrane | Ken Howell | John Costello | Roger McDowell | | 604 | 577 | 27 |
| 1989-09-23 | vs PHI | 157 | W 11-5 | 86-71 | 2 | 38,936 | Cris Carpenter | Dennis Cook | Frank DiPino | Dennis Cook | | 615 | 582 | 33 |
| 1989-09-24 | vs PHI | 158 | W 2-1 | 87-71 | 2 | 38,795 | Bob Tewksbury | Bruce Ruffin | Ted Power | Jeff Parrett | John Costello | 617 | 583 | 34 |
| 1989-09-25 | @ PIT | 159 | L 2-4 | 87-72 | 2 | 4,278 | Jose DeLeon | Neal Heaton | Neal Heaton | Jose DeLeon | Bill Landrum | 619 | 587 | 32 |
| 1989-09-26 | @ PIT | 160 | L 1-4 | 87-73 | 2 | 8,101 | Ken Hill | Bob Patterson | Bob Patterson | Ken Hill | Bill Landrum | 620 | 591 | 29 |
| 1989-09-27 | @ PIT | 161 | L 0-1 | 87-74 | 2 | 5,051 | Joe Magrane | Doug Drabek | Doug Drabek | Joe Magrane | | 620 | 592 | 28 |
| 1989-09-29 | vs CHN | 162 | W 7-5 | 88-74 | 2 | 41,599 | Bob Tewksbury | Steve Wilson | Ken Dayley | Paul Assenmacher | Scott Terry | 627 | 597 | 30 |
| 1989-09-30 | vs CHN | 163 | L 4-6 | 88-75 | 2 | 43,570 | Jose DeLeon | Scott Sanderson | Jeff Pico | John Costello | Les Lancaster | 631 | 603 | 28 |
| 1989-10-01 | vs CHN | 164 | L 1-5 | 88-76 | 3 | 37,846 | Ken Hill | Rick Sutcliffe | Rick Sutcliffe | Ken Hill | | 632 | 608 | 24 |