| 1989-04-03 | vs SLN | 1 | W 8-4 | 1-0 | 1 | 38,539 | Dwight Gooden | Joe Magrane | Dwight Gooden | Joe Magrane | Don Aase | 8 | 4 | 4 |
| 1989-04-05 | vs SLN | 2 | L 1-3 | 1-1 | 3 | 17,873 | Bob Ojeda | Jose DeLeon | Jose DeLeon | Bob Ojeda | Todd Worrell | 9 | 7 | 2 |
| 1989-04-07 | @ MON | 3 | L 3-7 | 1-2 | 5 | 17,263 | Ron Darling | Kevin Gross | Kevin Gross | Ron Darling | | 12 | 14 | -2 |
| 1989-04-08 | @ MON | 4 | L 2-3 | 1-3 | 5 | 23,506 | David Cone | Bryn Smith | Gene Harris | David Cone | Tim Burke | 14 | 17 | -3 |
| 1989-04-09 | @ MON | 5 | W 2-1 | 2-3 | 5 | 23,662 | Dwight Gooden | Dennis Martinez | Dwight Gooden | Andy McGaffigan | Randy Myers | 16 | 18 | -2 |
| 1989-04-11 | @ PIT | 6 | L 3-4 | 2-4 | 5 | 42,910 | Bob Ojeda | Doug Drabek | Jeff Robinson | Randy Myers | | 19 | 22 | -3 |
| 1989-04-13 | @ PIT | 7 | L 2-4 | 2-5 | 6 | 19,105 | Ron Darling | John Smiley | John Smiley | Ron Darling | Jeff Robinson | 21 | 26 | -5 |
| 1989-04-14 | @ SLN | 8 | W 9-4 | 3-5 | 4 | 51,257 | David Cone | Joe Magrane | David Cone | Joe Magrane | | 30 | 30 | 0 |
| 1989-04-15 | @ SLN | 9 | L 2-3 | 3-6 | 6 | 40,477 | Dwight Gooden | Don Heinkel | Dan Quisenberry | Don Aase | | 32 | 33 | -1 |
| 1989-04-16 | @ SLN | 10 | L 3-5 | 3-7 | 6 | 40,168 | Bob Ojeda | Jose DeLeon | Jose DeLeon | Bob Ojeda | | 35 | 38 | -3 |
| 1989-04-17 | vs PHI | 11 | W 5-2 | 4-7 | 5 | 28,087 | Sid Fernandez | Don Carman | Sid Fernandez | Don Carman | Randy Myers | 40 | 40 | 0 |
| 1989-04-18 | vs PHI | 12 | L 1-7 | 4-8 | 6 | 26,300 | Ron Darling | Larry McWilliams | Larry McWilliams | Ron Darling | | 41 | 47 | -6 |
| 1989-04-19 | vs PHI | 13 | W 4-2 | 5-8 | 6 | 25,694 | David Cone | Steve Ontiveros | Randy Myers | Steve Bedrosian | | 45 | 49 | -4 |
| 1989-04-20 | vs CHN | 14 | W 4-3 | 6-8 | 5 | 28,944 | Dwight Gooden | Mike Bielecki | Dwight Gooden | Mitch Williams | Roger McDowell | 49 | 52 | -3 |
| 1989-04-21 | vs CHN | 15 | L 4-8 | 6-9 | 5 | 34,690 | Bob Ojeda | Rick Sutcliffe | Rick Sutcliffe | Bob Ojeda | Steve Wilson | 53 | 60 | -7 |
| 1989-04-22 | vs CHN | 16 | W 3-1 | 7-9 | 5 | 41,323 | Sid Fernandez | Greg Maddux | Sid Fernandez | Greg Maddux | Roger McDowell | 56 | 61 | -5 |
| 1989-04-23 | vs CHN | 17 | W 4-2 | 8-9 | 5 | 40,268 | Ron Darling | Paul Kilgus | Rick Aguilera | Calvin Schiraldi | | 60 | 63 | -3 |
| 1989-04-25 | vs ATL | 18 | W 2-1 | 9-9 | 4 | 25,452 | David Cone | Zane Smith | David Cone | Zane Smith | Randy Myers | 62 | 64 | -2 |
| 1989-04-26 | vs ATL | 19 | W 6-1 | 10-9 | 1 | 39,665 | Dwight Gooden | Pete Smith | Dwight Gooden | Pete Smith | Randy Myers | 68 | 65 | 3 |
| 1989-04-28 | @ HOU | 20 | W 7-3 | 11-9 | 1 | 21,990 | Sid Fernandez | Rick Rhoden | Sid Fernandez | Rick Rhoden | Roger McDowell | 75 | 68 | 7 |
| 1989-04-29 | @ HOU | 21 | W 5-1 | 12-9 | 1 | 29,853 | Ron Darling | Bob Knepper | Ron Darling | Bob Knepper | Randy Myers | 80 | 69 | 11 |
| 1989-04-30 | @ HOU | 22 | L 6-7 | 12-10 | 2 | 33,838 | David Cone | Mike Scott | Mike Scott | David Cone | Dave Smith | 86 | 76 | 10 |
| 1989-05-01 | @ ATL | 23 | W 3-1 | 13-10 | 2 | 8,854 | Dwight Gooden | Zane Smith | Dwight Gooden | Zane Smith | Roger McDowell | 89 | 77 | 12 |
| 1989-05-02 | @ ATL | 24 | W 7-1 | 14-10 | 1 | 12,834 | Bob Ojeda | Pete Smith | Bob Ojeda | Pete Smith | | 96 | 78 | 18 |
| 1989-05-03 | vs CIN | 25 | L 4-6 | 14-11 | 1 | 27,412 | Sid Fernandez | Jose Rijo | Jose Rijo | Sid Fernandez | John Franco | 100 | 84 | 16 |
| 1989-05-04 | vs CIN | 26 | W 3-2 | 15-11 | 1 | 29,396 | Ron Darling | Danny Jackson | Randy Myers | Rob Dibble | | 103 | 86 | 17 |
| 1989-05-06 | vs HOU | 27 | W 2-1 | 16-11 | 1 | 35,505 | David Cone | Jim Clancy | David Cone | Jim Clancy | | 105 | 87 | 18 |
| 1989-05-07 | vs HOU | 28 | L 0-5 | 16-12 | 1 | 47,591 | Dwight Gooden | Jim Deshaies | Jim Deshaies | Dwight Gooden | | 105 | 92 | 13 |
| 1989-05-08 | @ CIN | 29 | L 0-3 | 16-13 | 2 | 20,384 | Bob Ojeda | Jose Rijo | Jose Rijo | Bob Ojeda | John Franco | 105 | 95 | 10 |
| 1989-05-09 | @ CIN | 30 | W 3-1 | 17-13 | 1 | 12,645 | Sid Fernandez | Danny Jackson | Sid Fernandez | Danny Jackson | Randy Myers | 108 | 96 | 12 |
| 1989-05-10 | @ CIN | 31 | W 11-4 | 18-13 | 1 | 19,112 | Ron Darling | Tom Browning | Ron Darling | Tom Browning | Rick Aguilera | 119 | 100 | 19 |
| 1989-05-12 | vs SDN | 32 | L 3-4 | 18-14 | 2 | 32,530 | Dwight Gooden | Bruce Hurst | Mark Davis | Roger McDowell | | 122 | 104 | 18 |
| 1989-05-13 | vs SDN | 33 | W 4-3 | 19-14 | 1 | 46,484 | David Cone | Ed Whitson | Randy Myers | Greg Harris | | 126 | 107 | 19 |
| 1989-05-14 | vs SDN | 34 | W 2-1 | 20-14 | 1 | 35,547 | Bob Ojeda | Dennis Rasmussen | Roger McDowell | Dave Leiper | | 128 | 108 | 20 |
| 1989-05-15 | vs LAN | 35 | L 1-3 | 20-15 | 1 | 34,622 | Sid Fernandez | Mike Morgan | Ray Searage | Roger McDowell | Jay Howell | 129 | 111 | 18 |
| 1989-05-17 | vs LAN | 36 | L 3-4 | 20-16 | 1 | 37,655 | Ron Darling | Fernando Valenzuela | Alejandro Pena | Rick Aguilera | Jay Howell | 132 | 115 | 17 |
| 1989-05-18 | vs LAN | 37 | W 5-3 | 21-16 | 1 | 31,189 | Dwight Gooden | Tim Leary | Dwight Gooden | Alejandro Pena | Randy Myers | 137 | 118 | 19 |
| 1989-05-19 | vs SFN | 38 | W 3-2 | 22-16 | 1 | 37,402 | David Cone | Don Robinson | Randy Myers | Craig Lefferts | | 140 | 120 | 20 |
| 1989-05-20 | vs SFN | 39 | L 0-3 | 22-17 | 1 | 45,565 | Bob Ojeda | Mike Krukow | Mike Krukow | Bob Ojeda | Mike LaCoss | 140 | 123 | 17 |
| 1989-05-21 | vs SFN | 40 | L 6-10 | 22-18 | 1 | 44,660 | Sid Fernandez | Scott Garrelts | Atlee Hammaker | Roger McDowell | Craig Lefferts | 146 | 133 | 13 |
| 1989-05-23 | @ SDN | 41 | L 2-3 | 22-19 | 2 | 32,678 | Dwight Gooden | Eric Show | Eric Show | Dwight Gooden | Mark Davis | 148 | 136 | 12 |
| 1989-05-24 | @ SDN | 42 | W 3-0 | 23-19 | 2 | 26,766 | Ron Darling | Bruce Hurst | Ron Darling | Bruce Hurst | Rick Aguilera | 151 | 136 | 15 |
| 1989-05-25 | @ SDN | 43 | L 1-2 | 23-20 | 2 | 28,102 | David Cone | Ed Whitson | Ed Whitson | David Cone | Mark Davis | 152 | 138 | 14 |
| 1989-05-26 | @ LAN | 44 | W 8-2 | 24-20 | 2 | 47,034 | Bob Ojeda | Orel Hershiser | Bob Ojeda | Orel Hershiser | | 160 | 140 | 20 |
| 1989-05-27 | @ LAN | 45 | L 1-2 | 24-21 | 2 | 47,083 | Sid Fernandez | Mike Morgan | Mike Morgan | Sid Fernandez | Jay Howell | 161 | 142 | 19 |
| 1989-05-28 | @ LAN | 46 | L 3-4 | 24-22 | 2 | 46,060 | Dwight Gooden | Fernando Valenzuela | Ray Searage | Roger McDowell | | 164 | 146 | 18 |
| 1989-05-29 | @ SFN | 47 | L 2-3 | 24-23 | 3 | 38,899 | Ron Darling | Don Robinson | Don Robinson | Ron Darling | Craig Lefferts | 166 | 149 | 17 |
| 1989-05-30 | @ SFN | 48 | L 3-10 | 24-24 | 3 | 17,398 | David Cone | Mike Krukow | Mike Krukow | David Cone | | 169 | 159 | 10 |
| 1989-05-31 | @ SFN | 49 | W 3-1 | 25-24 | 3 | 21,658 | Bob Ojeda | Scott Garrelts | Randy Myers | Craig Lefferts | Rick Aguilera | 172 | 160 | 12 |
| 1989-06-02 | vs PIT | 50 | W 3-2 | 26-24 | 3 | 42,578 | Dwight Gooden | John Smiley | Rick Aguilera | Randy Kramer | | 175 | 162 | 13 |
| 1989-06-03 | vs PIT | 51 | W 9-3 | 27-24 | 3 | 47,835 | Ron Darling | Bob Walk | Ron Darling | Bob Walk | | 184 | 165 | 19 |
| 1989-06-04 | vs PIT | 52 | W 4-3 | 28-24 | 3 | 47,478 | Sid Fernandez | Doug Drabek | Don Aase | Bob Kipper | Randy Myers | 188 | 168 | 20 |
| 1989-06-05 | @ CHN | 53 | L 3-15 | 28-25 | 3 | 34,840 | David Cone | Greg Maddux | Greg Maddux | David Cone | | 191 | 183 | 8 |
| 1989-06-06 | @ CHN | 54 | L 4-8 | 28-26 | 3 | 33,558 | Bob Ojeda | Paul Kilgus | Paul Kilgus | Bob Ojeda | | 195 | 191 | 4 |
| 1989-06-07 | @ CHN | 55 | W 10-5 | 29-26 | 3 | 35,372 | Dwight Gooden | Rick Sutcliffe | Dwight Gooden | Rick Sutcliffe | Rick Aguilera | 205 | 196 | 9 |
| 1989-06-08 | @ CHN | 56 | L 4-5 | 29-27 | 3 | 36,358 | Ron Darling | Mike Bielecki | Mitch Williams | Don Aase | | 209 | 201 | 8 |
| 1989-06-09 | @ PIT | 57 | L 3-4 | 29-28 | 3 | 20,819 | Sid Fernandez | Doug Drabek | Bill Landrum | Roger McDowell | | 212 | 205 | 7 |
| 1989-06-10 | @ PIT | 58 | L 5-6 | 29-29 | 4 | 27,463 | David Cone | Randy Kramer | Bob Kipper | Randy Myers | | 217 | 211 | 6 |
| 1989-06-11 | @ PIT | 59 | W 6-1 | 30-29 | 4 | 37,716 | Bob Ojeda | Brian Fisher | Bob Ojeda | Brian Fisher | | 223 | 212 | 11 |
| 1989-06-13 | vs CHN | 60 | L 2-4 | 30-30 | 4 | 26,664 | Ron Darling | Mike Bielecki | Mike Bielecki | Ron Darling | Mitch Williams | 225 | 216 | 9 |
| 1989-06-14 | vs CHN | 61 | W 2-0 | 31-30 | 4 | 27,278 | Dwight Gooden | Scott Sanderson | Dwight Gooden | Scott Sanderson | Rick Aguilera | 227 | 216 | 11 |
| 1989-06-15 | vs CHN | 62 | W 4-3 | 32-30 | 4 | 24,689 | Sid Fernandez | Greg Maddux | Rick Aguilera | Pat Perry | | 231 | 219 | 12 |
| 1989-06-16 | @ PHI | 63 | W 15-11 | 33-30 | 4 | 33,135 | David Cone | Bruce Ruffin | Randy Myers | Steve Bedrosian | | 246 | 230 | 16 |
| 1989-06-17 | @ PHI | 64 | W 1-0 | 34-30 | 3 | 46,570 | Bob Ojeda | Larry McWilliams | Bob Ojeda | Larry McWilliams | | 247 | 230 | 17 |
| 1989-06-18 | @ PHI | 65 | L 5-6 | 34-31 | 3 | 43,689 | Ron Darling | Ken Howell | Jeff Parrett | Randy Myers | | 252 | 236 | 16 |
| 1989-06-19 | vs MON | 66 | W 5-3 | 35-31 | 2 | 40,064 | Dwight Gooden | Kevin Gross | Dwight Gooden | Kevin Gross | Rick Aguilera | 257 | 239 | 18 |
| 1989-06-20 | vs MON | 67 | L 5-8 | 35-32 | 4 | 37,570 | Sid Fernandez | Dennis Martinez | Tim Burke | Rick Aguilera | | 262 | 247 | 15 |
| 1989-06-21 | vs MON | 68 | W 2-0 | 36-32 | 2 | 30,458 | David Cone | Bryn Smith | David Cone | Bryn Smith | Randy Myers | 264 | 247 | 17 |
| 1989-06-23 | vs PHI | 69 | W 9-3 | 37-32 | 2 | 44,828 | Bob Ojeda | Ken Howell | Bob Ojeda | Ken Howell | Randy Myers | 273 | 250 | 23 |
| 1989-06-24 | vs PHI | 70 | W 4-2 | 38-32 | 2 | 48,323 | Ron Darling | Floyd Youmans | Ron Darling | Floyd Youmans | Randy Myers | 277 | 252 | 25 |
| 1989-06-25 | vs PHI | 71 | W 5-1 | 39-32 | 1 | 47,692 | Sid Fernandez | Terry Mulholland | Sid Fernandez | Terry Mulholland | | 282 | 253 | 29 |
| 1989-06-26 | @ MON | 72 | L 1-5 | 39-33 | 2 | 27,395 | Dwight Gooden | Pascual Perez | Pascual Perez | Dwight Gooden | | 283 | 258 | 25 |
| 1989-06-27 | @ MON | 73 | L 2-3 | 39-34 | 2 | 28,349 | David Cone | Bryn Smith | Steve Frey | Rick Aguilera | | 285 | 261 | 24 |
| 1989-06-28 | @ MON | 74 | L 3-4 | 39-35 | 2 | 31,229 | Bob Ojeda | Mark Langston | Mark Langston | Bob Ojeda | Tim Burke | 288 | 265 | 23 |
| 1989-06-30 | @ CIN | 75 | W 11-1 | 40-35 | 2 | 33,855 | Ron Darling | Rick Mahler | Ron Darling | Rick Mahler | | 299 | 266 | 33 |
| 1989-07-01 | @ CIN | 76 | L 2-6 | 40-36 | 3 | 32,561 | Dwight Gooden | Jack Armstrong | Jack Armstrong | Dwight Gooden | John Franco | 301 | 272 | 29 |
| 1989-07-02 | @ CIN | 77 | W 7-2 | 41-36 | 2 | 33,910 | Sid Fernandez | Scott Scudder | Sid Fernandez | Scott Scudder | | 308 | 274 | 34 |
| 1989-07-03 | @ HOU | 78 | W 3-1 | 42-36 | 2 | 40,786 | David Cone | Jim Deshaies | David Cone | Jim Deshaies | Randy Myers | 311 | 275 | 36 |
| 1989-07-04 | @ HOU | 79 | L 3-10 | 42-37 | 2 | 33,444 | Bob Ojeda | Mike Scott | Mike Scott | Bob Ojeda | | 314 | 285 | 29 |
| 1989-07-05 | @ HOU | 80 | L 5-6 | 42-38 | 3 | 24,675 | Ron Darling | Bob Knepper | Danny Darwin | Ron Darling | Dave Smith | 319 | 291 | 28 |
| 1989-07-06 | vs CIN | 81 | L 2-10 | 42-39 | 4 | 47,267 | David West | Danny Jackson | Danny Jackson | David West | Kent Tekulve | 321 | 301 | 20 |
| 1989-07-07 | vs CIN | 82 | W 7-1 | 43-39 | 4 | 40,242 | Sid Fernandez | Scott Scudder | Sid Fernandez | Scott Scudder | | 328 | 302 | 26 |
| 1989-07-08 | vs CIN | 83 | W 8-3 | 44-39 | 3 | 46,789 | David Cone | Tom Browning | David Cone | Tom Browning | | 336 | 305 | 31 |
| 1989-07-09 | vs CIN | 84 | W 6-3 | 45-39 | 3 | 46,357 | Bob Ojeda | Rick Mahler | Rick Aguilera | Norm Charlton | | 342 | 308 | 34 |
| 1989-07-13 | @ ATL | 85 | W 5-1 | 46-39 | 3 | 13,690 | Ron Darling | Pete Smith | Ron Darling | Pete Smith | | 347 | 309 | 38 |
| 1989-07-14 | @ ATL | 86 | L 2-3 | 46-40 | 3 | 24,143 | Sid Fernandez | John Smoltz | Joe Boever | Sid Fernandez | | 349 | 312 | 37 |
| 1989-07-15 | @ ATL | 87 | W 6-4 | 47-40 | 2 | 35,542 | David Cone | Derek Lilliquist | Rick Aguilera | Paul Assenmacher | Randy Myers | 355 | 316 | 39 |
| 1989-07-16 | @ ATL | 88 | L 2-6 | 47-41 | 2 | 16,977 | Bob Ojeda | Marty Clary | Marty Clary | Bob Ojeda | | 357 | 322 | 35 |
| 1989-07-17 | vs HOU | 89 | L 0-6 | 47-43 | 4 | 0 | Ron Darling | Jim Deshaies | Jim Deshaies | Ron Darling | | 357 | 328 | 29 |
| 1989-07-17 | vs HOU | 90 | L 3-12 | 47-43 | 4 | 36,278 | David West | Bob Knepper | Bob Knepper | David West | Danny Darwin | 360 | 340 | 20 |
| 1989-07-18 | vs HOU | 91 | W 9-0 | 48-43 | 3 | 35,664 | Sid Fernandez | Bob Forsch | Sid Fernandez | Bob Forsch | | 369 | 340 | 29 |
| 1989-07-19 | vs HOU | 92 | W 8-2 | 49-43 | 3 | 35,511 | David Cone | Jim Clancy | David Cone | Jim Clancy | | 377 | 342 | 35 |
| 1989-07-20 | vs ATL | 93 | W 4-1 | 50-43 | 3 | 21,376 | Bob Ojeda | Derek Lilliquist | Bob Ojeda | Derek Lilliquist | Rick Aguilera | 381 | 343 | 38 |
| 1989-07-21 | vs ATL | 94 | W 6-4 | 51-43 | 2 | 31,969 | Ron Darling | Marty Clary | Ron Darling | Marty Clary | Randy Myers | 387 | 347 | 40 |
| 1989-07-22 | vs ATL | 95 | W 7-5 | 52-43 | 2 | 49,142 | Sid Fernandez | Tom Glavine | Rick Aguilera | Jim Acker | Randy Myers | 394 | 352 | 42 |
| 1989-07-23 | vs ATL | 96 | W 7-2 | 53-43 | 2 | 45,226 | David Cone | Sergio Valdez | David Cone | Sergio Valdez | | 401 | 354 | 47 |
| 1989-07-25 | vs PIT | 97 | L 2-4 | 53-44 | 3 | 38,249 | Bob Ojeda | Doug Drabek | Doug Drabek | Rick Aguilera | Bill Landrum | 403 | 358 | 45 |
| 1989-07-26 | vs PIT | 98 | L 2-3 | 53-45 | 3 | 38,134 | Ron Darling | John Smiley | John Smiley | Ron Darling | | 405 | 361 | 44 |
| 1989-07-27 | vs PIT | 99 | L 8-10 | 53-46 | 3 | 39,447 | Sid Fernandez | Jeff Robinson | Bob Kipper | Don Aase | Bill Landrum | 413 | 371 | 42 |
| 1989-07-28 | @ CHN | 100 | L 5-6 | 53-47 | 4 | 37,554 | David Cone | Scott Sanderson | Calvin Schiraldi | Rick Aguilera | Mitch Williams | 418 | 377 | 41 |
| 1989-07-29 | @ CHN | 101 | L 3-10 | 53-48 | 4 | 38,012 | Wally Whitehurst | Greg Maddux | Greg Maddux | Wally Whitehurst | | 421 | 387 | 34 |
| 1989-07-30 | @ CHN | 102 | L 4-6 | 53-49 | 4 | 36,837 | Bob Ojeda | Mike Bielecki | Les Lancaster | Rick Aguilera | | 425 | 393 | 32 |
| 1989-07-31 | @ SLN | 103 | L 2-3 | 53-50 | 4 | 39,657 | Ron Darling | Jose DeLeon | Jose DeLeon | Ron Darling | Todd Worrell | 427 | 396 | 31 |
| 1989-08-01 | @ SLN | 104 | W 11-0 | 54-50 | 4 | 40,444 | Sid Fernandez | Scott Terry | Sid Fernandez | Scott Terry | | 438 | 396 | 42 |
| 1989-08-02 | @ SLN | 105 | W 4-3 | 55-50 | 4 | 41,438 | Frank Viola | Ted Power | Frank Viola | Todd Worrell | Randy Myers | 442 | 399 | 43 |
| 1989-08-03 | @ SLN | 106 | L 5-6 | 55-51 | 4 | 44,496 | David Cone | Ken Hill | Dan Quisenberry | Jeff Musselman | Ken Dayley | 447 | 405 | 42 |
| 1989-08-04 | vs MON | 107 | W 11-5 | 56-51 | 4 | 41,457 | Bob Ojeda | Bryn Smith | Bob Ojeda | Bryn Smith | | 458 | 410 | 48 |
| 1989-08-05 | vs MON | 108 | W 3-2 | 57-51 | 4 | 46,175 | Ron Darling | Mark Langston | Ron Darling | Tim Burke | | 461 | 412 | 49 |
| 1989-08-06 | vs MON | 109 | W 2-1 | 58-51 | 4 | 43,658 | Sid Fernandez | Kevin Gross | Jeff Musselman | Steve Frey | | 463 | 413 | 50 |
| 1989-08-07 | @ PHI | 110 | L 1-2 | 58-52 | 4 | 35,350 | Frank Viola | Ken Howell | Roger McDowell | Jeff Musselman | | 464 | 415 | 49 |
| 1989-08-08 | @ PHI | 111 | W 9-0 | 59-52 | 4 | 35,196 | David Cone | Bruce Ruffin | David Cone | Bruce Ruffin | | 473 | 415 | 58 |
| 1989-08-09 | @ PHI | 112 | W 6-0 | 60-52 | 4 | 43,462 | Bob Ojeda | Dennis Cook | Bob Ojeda | Dennis Cook | | 479 | 415 | 64 |
| 1989-08-10 | vs SLN | 113 | W 5-1 | 62-52 | 3 | 0 | Ron Darling | Jose DeLeon | Ron Darling | Jose DeLeon | | 484 | 416 | 68 |
| 1989-08-10 | vs SLN | 114 | W 6-4 | 62-52 | 3 | 48,712 | Sid Fernandez | Ricky Horton | Jeff Musselman | John Costello | Randy Myers | 490 | 420 | 70 |
| 1989-08-11 | vs SLN | 115 | L 0-3 | 62-53 | 3 | 24,882 | Frank Viola | Scott Terry | Scott Terry | Frank Viola | Ken Dayley | 490 | 423 | 67 |
| 1989-08-12 | vs SLN | 116 | W 3-1 | 63-53 | 3 | 35,414 | David Cone | Ted Power | David Cone | Ted Power | Randy Myers | 493 | 424 | 69 |
| 1989-08-13 | vs SLN | 117 | W 3-2 | 64-53 | 3 | 39,341 | Bob Ojeda | Ken Hill | Bob Ojeda | Ken Hill | Randy Myers | 496 | 426 | 70 |
| 1989-08-15 | vs SDN | 118 | W 3-2 | 65-53 | 2 | 32,885 | Sid Fernandez | Ed Whitson | Jeff Musselman | Ed Whitson | | 499 | 428 | 71 |
| 1989-08-16 | vs SDN | 119 | W 7-2 | 66-53 | 2 | 36,768 | Ron Darling | Dennis Rasmussen | Ron Darling | Dennis Rasmussen | Don Aase | 506 | 430 | 76 |
| 1989-08-17 | vs SDN | 120 | L 2-6 | 66-54 | 2 | 40,406 | Frank Viola | Bruce Hurst | Bruce Hurst | Frank Viola | | 508 | 436 | 72 |
| 1989-08-18 | vs LAN | 121 | W 3-2 | 67-54 | 2 | 46,143 | David Cone | Orel Hershiser | David Cone | Orel Hershiser | Randy Myers | 511 | 438 | 73 |
| 1989-08-19 | vs LAN | 122 | W 4-1 | 68-54 | 2 | 38,453 | Bob Ojeda | John Wetteland | Bob Ojeda | John Wetteland | Randy Myers | 515 | 439 | 76 |
| 1989-08-20 | vs LAN | 123 | L 4-5 | 68-55 | 2 | 45,031 | Sid Fernandez | Ramon Martinez | Alejandro Pena | Don Aase | Jay Howell | 519 | 444 | 75 |
| 1989-08-21 | vs SFN | 124 | W 4-1 | 69-55 | 2 | 41,200 | Ron Darling | Mike LaCoss | Ron Darling | Mike LaCoss | Randy Myers | 523 | 445 | 78 |
| 1989-08-22 | vs SFN | 125 | L 0-5 | 69-56 | 2 | 48,249 | Frank Viola | Bob Knepper | Bob Knepper | Frank Viola | | 523 | 450 | 73 |
| 1989-08-23 | vs SFN | 126 | L 0-5 | 69-57 | 2 | 43,694 | David Cone | Rick Reuschel | Rick Reuschel | David Cone | | 523 | 455 | 68 |
| 1989-08-25 | @ SDN | 127 | L 3-5 | 69-58 | 4 | 32,150 | Sid Fernandez | Ed Whitson | Greg Harris | Randy Myers | | 526 | 460 | 66 |
| 1989-08-26 | @ SDN | 128 | L 4-9 | 69-59 | 4 | 28,469 | Ron Darling | Dennis Rasmussen | Dennis Rasmussen | Ron Darling | Greg Harris | 530 | 469 | 61 |
| 1989-08-27 | @ SDN | 129 | L 7-13 | 69-60 | 4 | 30,558 | Bob Ojeda | Don Schulze | Pat Clements | John Mitchell | Mark Grant | 537 | 482 | 55 |
| 1989-08-28 | @ LAN | 130 | W 1-0 | 70-60 | 4 | 38,820 | Frank Viola | Orel Hershiser | Frank Viola | Orel Hershiser | | 538 | 482 | 56 |
| 1989-08-29 | @ LAN | 131 | W 2-1 | 71-60 | 3 | 36,756 | David Cone | John Wetteland | David Cone | John Wetteland | | 540 | 483 | 57 |
| 1989-08-30 | @ LAN | 132 | W 9-3 | 72-60 | 3 | 37,109 | Sid Fernandez | Ramon Martinez | Sid Fernandez | Ramon Martinez | | 549 | 486 | 63 |
| 1989-09-01 | @ SFN | 133 | L 1-7 | 72-61 | 3 | 29,413 | Ron Darling | Scott Garrelts | Scott Garrelts | Ron Darling | | 550 | 493 | 57 |
| 1989-09-02 | @ SFN | 134 | L 2-6 | 72-62 | 3 | 31,066 | Frank Viola | Rick Reuschel | Rick Reuschel | Frank Viola | | 552 | 499 | 53 |
| 1989-09-03 | @ SFN | 135 | L 0-4 | 72-63 | 4 | 44,084 | Bob Ojeda | Don Robinson | Don Robinson | Bob Ojeda | | 552 | 503 | 49 |
| 1989-09-04 | vs CHN | 136 | L 3-7 | 72-64 | 4 | 46,049 | David Cone | Rick Sutcliffe | Rick Sutcliffe | David Cone | Les Lancaster | 555 | 510 | 45 |
| 1989-09-05 | vs CHN | 137 | W 3-2 | 73-64 | 4 | 39,352 | Sid Fernandez | Jeff Pico | Sid Fernandez | Mitch Williams | | 558 | 512 | 46 |
| 1989-09-06 | vs SLN | 138 | L 2-3 | 73-65 | 4 | 38,283 | Ron Darling | Ricky Horton | Frank DiPino | Ron Darling | Ken Dayley | 560 | 515 | 45 |
| 1989-09-07 | vs SLN | 139 | W 13-1 | 74-65 | 4 | 23,354 | Frank Viola | Ted Power | Frank Viola | Ted Power | | 573 | 516 | 57 |
| 1989-09-08 | vs PIT | 140 | W 7-2 | 75-65 | 3 | 36,902 | Bob Ojeda | Doug Drabek | Bob Ojeda | Doug Drabek | | 580 | 518 | 62 |
| 1989-09-09 | vs PIT | 141 | L 5-8 | 75-66 | 4 | 41,722 | David Cone | Jeff Robinson | Dorn Taylor | Jeff Innis | Bob Patterson | 585 | 526 | 59 |
| 1989-09-10 | vs PIT | 142 | L 1-4 | 75-67 | 4 | 45,024 | Sid Fernandez | John Smiley | John Smiley | Sid Fernandez | Bob Kipper | 586 | 530 | 56 |
| 1989-09-11 | @ PHI | 143 | W 5-2 | 76-67 | 3 | 18,690 | Ron Darling | Bruce Ruffin | Ron Darling | Bruce Ruffin | Randy Myers | 591 | 532 | 59 |
| 1989-09-12 | @ PHI | 144 | L 1-2 | 76-68 | 3 | 22,953 | Frank Viola | Ken Howell | Roger McDowell | Don Aase | | 592 | 534 | 58 |
| 1989-09-13 | @ PHI | 145 | W 10-4 | 77-68 | 3 | 20,062 | Bob Ojeda | Jason Grimsley | Bob Ojeda | Jason Grimsley | | 602 | 538 | 64 |
| 1989-09-15 | @ MON | 146 | W 5-0 | 78-68 | 3 | 24,545 | David Cone | Dennis Martinez | David Cone | Dennis Martinez | | 607 | 538 | 69 |
| 1989-09-16 | @ MON | 147 | L 1-10 | 78-69 | 3 | 32,228 | Sid Fernandez | Pascual Perez | Pascual Perez | Sid Fernandez | | 608 | 548 | 60 |
| 1989-09-17 | @ MON | 148 | L 0-1 | 78-70 | 3 | 32,811 | Ron Darling | Mark Langston | Mark Langston | Ron Darling | | 608 | 549 | 59 |
| 1989-09-18 | @ CHN | 149 | L 6-10 | 78-71 | 3 | 38,138 | Frank Viola | Paul Kilgus | Dean Wilkins | Frank Viola | Mitch Williams | 614 | 559 | 55 |
| 1989-09-19 | @ CHN | 150 | W 5-2 | 79-71 | 3 | 35,937 | Bob Ojeda | Steve Wilson | Bob Ojeda | Steve Wilson | Dwight Gooden | 619 | 561 | 58 |
| 1989-09-20 | @ SLN | 151 | L 3-5 | 79-72 | 3 | 35,884 | David Cone | Ken Hill | Frank DiPino | David Cone | Ken Dayley | 622 | 566 | 56 |
| 1989-09-21 | @ SLN | 152 | W 6-1 | 80-72 | 3 | 36,600 | Sid Fernandez | Ricky Horton | Sid Fernandez | Ricky Horton | | 628 | 567 | 61 |
| 1989-09-22 | vs MON | 153 | W 3-2 | 81-72 | 3 | 16,640 | Ron Darling | Pascual Perez | Ron Darling | John Candelaria | Randy Myers | 631 | 569 | 62 |
| 1989-09-23 | vs MON | 154 | W 13-6 | 82-72 | 3 | 36,844 | Frank Viola | Mark Langston | Frank Viola | Mark Langston | | 644 | 575 | 69 |
| 1989-09-24 | vs MON | 155 | L 5-6 | 82-73 | 3 | 36,769 | David Cone | Mark Gardner | Joe Hesketh | Julio Machado | Tim Burke | 649 | 581 | 68 |
| 1989-09-25 | vs PHI | 156 | L 1-2 | 82-74 | 3 | 18,001 | Bob Ojeda | Pat Combs | Pat Combs | Bob Ojeda | Roger McDowell | 650 | 583 | 67 |
| 1989-09-26 | vs PHI | 157 | W 3-0 | 83-74 | 3 | 17,385 | Sid Fernandez | Jason Grimsley | Sid Fernandez | Jason Grimsley | | 653 | 583 | 70 |
| 1989-09-27 | vs PHI | 158 | L 3-5 | 83-75 | 3 | 18,666 | Ron Darling | Ken Howell | Ken Howell | Ron Darling | Roger McDowell | 656 | 588 | 68 |
| 1989-09-29 | @ PIT | 159 | W 6-2 | 85-75 | 3 | 0 | Frank Viola | Randy Kramer | Frank Viola | Randy Kramer | | 662 | 590 | 72 |
| 1989-09-29 | @ PIT | 160 | W 7-0 | 85-75 | 3 | 16,734 | David Cone | Jeff Robinson | David Cone | Jeff Robinson | | 669 | 590 | 79 |
| 1989-09-30 | @ PIT | 161 | W 7-2 | 86-75 | 3 | 20,624 | Blaine Beatty | Neal Heaton | Randy Myers | Bill Landrum | | 676 | 592 | 84 |
| 1989-10-01 | @ PIT | 162 | W 7-3 | 87-75 | 2 | 23,502 | Sid Fernandez | Bob Patterson | Sid Fernandez | Bob Patterson | | 683 | 595 | 88 |