| 1998-03-31 | @ SEA | 1 | W 10-9 | 1-0 | 2 | 57,822 | Charles Nagy | Randy Johnson | Jose Mesa | Tony Fossas | Michael Jackson | 10 | 9 | 1 |
| 1998-04-01 | @ SEA | 2 | W 9-7 | 2-0 | 2 | 24,523 | Jaret Wright | Jamie Moyer | Jaret Wright | Jamie Moyer | Michael Jackson | 19 | 16 | 3 |
| 1998-04-03 | @ ANA | 3 | W 6-2 | 3-0 | 1 | 26,240 | Dave Burba | Jack McDowell | Dave Burba | Jack McDowell | | 25 | 18 | 7 |
| 1998-04-04 | @ ANA | 4 | W 11-0 | 4-0 | 1 | 34,834 | Bartolo Colon | Allen Watson | Bartolo Colon | Allen Watson | | 36 | 18 | 18 |
| 1998-04-05 | @ ANA | 5 | W 6-4 | 5-0 | 1 | 35,628 | Charles Nagy | Jason Dickson | Charles Nagy | Jason Dickson | Michael Jackson | 42 | 22 | 20 |
| 1998-04-06 | @ OAK | 6 | W 6-5 | 6-0 | 1 | 6,963 | Jaret Wright | Tom Candiotti | Rick Krivda | Tom Candiotti | Michael Jackson | 48 | 27 | 21 |
| 1998-04-08 | @ OAK | 7 | L 1-3 | 6-1 | 1 | 8,361 | Dave Burba | Kenny Rogers | Kenny Rogers | Dave Burba | Billy Taylor | 49 | 30 | 19 |
| 1998-04-10 | vs ANA | 8 | W 8-5 | 7-1 | 1 | 42,707 | Bartolo Colon | Allen Watson | Eric Plunk | Troy Percival | | 57 | 35 | 22 |
| 1998-04-11 | vs ANA | 9 | W 8-5 | 8-1 | 1 | 42,802 | Charles Nagy | Jason Dickson | Charles Nagy | Jason Dickson | Michael Jackson | 65 | 40 | 25 |
| 1998-04-12 | vs ANA | 10 | L 1-12 | 8-2 | 1 | 42,555 | Jaret Wright | Chuck Finley | Chuck Finley | Jaret Wright | | 66 | 52 | 14 |
| 1998-04-13 | vs SEA | 11 | W 6-5 | 9-2 | 1 | 42,793 | Dave Burba | Ken Cloude | Dave Burba | Ken Cloude | Michael Jackson | 72 | 57 | 15 |
| 1998-04-14 | vs SEA | 12 | W 8-3 | 10-2 | 1 | 40,490 | Rick Krivda | Bill Swift | Paul Assenmacher | Heathcliff Slocumb | | 80 | 60 | 20 |
| 1998-04-15 | vs SEA | 13 | L 3-5 | 10-3 | 1 | 40,527 | Bartolo Colon | Randy Johnson | Paul Spoljaric | Paul Assenmacher | Bobby Ayala | 83 | 65 | 18 |
| 1998-04-17 | @ BOS | 14 | L 2-3 | 10-4 | 1 | 26,924 | Charles Nagy | Pedro Martinez | Tom Gordon | Paul Assenmacher | | 85 | 68 | 17 |
| 1998-04-18 | @ BOS | 15 | W 7-4 | 11-4 | 1 | 31,735 | Jaret Wright | Tim Wakefield | Tom Martin | Dennis Eckersley | Michael Jackson | 92 | 72 | 20 |
| 1998-04-19 | @ BOS | 16 | L 0-2 | 11-5 | 1 | 31,846 | Dave Burba | Bret Saberhagen | Bret Saberhagen | Dave Burba | Tom Gordon | 92 | 74 | 18 |
| 1998-04-20 | @ BOS | 17 | L 5-6 | 11-6 | 1 | 33,001 | Bartolo Colon | Butch Henry | Tom Gordon | Eric Plunk | | 97 | 80 | 17 |
| 1998-04-21 | vs CHA | 18 | W 14-6 | 12-6 | 1 | 42,836 | Chad Ogea | James Baldwin | Jose Mesa | James Baldwin | | 111 | 86 | 25 |
| 1998-04-22 | vs CHA | 19 | L 7-14 | 12-7 | 1 | 42,840 | Charles Nagy | Mike Sirotka | Mike Sirotka | Charles Nagy | | 118 | 100 | 18 |
| 1998-04-23 | vs CHA | 20 | W 5-4 | 13-7 | 1 | 42,865 | Jaret Wright | Jason Bere | Eric Plunk | Tony Castillo | Michael Jackson | 123 | 104 | 19 |
| 1998-04-24 | vs BOS | 21 | L 5-7 | 13-8 | 1 | 40,570 | Dave Burba | Tim Wakefield | Tim Wakefield | Dave Burba | Tom Gordon | 128 | 111 | 17 |
| 1998-04-25 | vs BOS | 22 | L 2-3 | 13-9 | 1 | 40,571 | Bartolo Colon | Bret Saberhagen | Bret Saberhagen | Bartolo Colon | Tom Gordon | 130 | 114 | 16 |
| 1998-04-27 | @ CHA | 23 | L 3-10 | 13-10 | 1 | 13,575 | Chad Ogea | Mike Sirotka | Mike Sirotka | Chad Ogea | | 133 | 124 | 9 |
| 1998-04-28 | @ CHA | 24 | W 4-1 | 14-10 | 1 | 13,208 | Charles Nagy | Jason Bere | Charles Nagy | Matt Karchner | Michael Jackson | 137 | 125 | 12 |
| 1998-04-29 | vs OAK | 25 | L 4-11 | 14-11 | 1 | 42,190 | Jaret Wright | Kenny Rogers | Kenny Rogers | Jaret Wright | | 141 | 136 | 5 |
| 1998-04-30 | vs OAK | 26 | L 2-5 | 14-12 | 1 | 42,855 | Dave Burba | Jimmy Haynes | T.J. Mathews | Paul Assenmacher | Billy Taylor | 143 | 141 | 2 |
| 1998-05-01 | vs TBA | 27 | W 7-5 | 15-12 | 1 | 42,712 | Bartolo Colon | Dennis Springer | Bartolo Colon | Dennis Springer | Michael Jackson | 150 | 146 | 4 |
| 1998-05-02 | vs TBA | 28 | W 5-1 | 16-12 | 1 | 42,525 | Chad Ogea | Tony Saunders | Chad Ogea | Tony Saunders | | 155 | 147 | 8 |
| 1998-05-03 | vs TBA | 29 | W 10-8 | 17-12 | 1 | 42,597 | Charles Nagy | Jason Johnson | Jose Mesa | Roberto Hernandez | | 165 | 155 | 10 |
| 1998-05-05 | vs BAL | 30 | W 6-5 | 18-12 | 1 | 40,706 | Jaret Wright | Jimmy Key | Paul Assenmacher | Armando Benitez | | 171 | 160 | 11 |
| 1998-05-06 | vs BAL | 31 | W 14-5 | 19-12 | 1 | 40,672 | Dave Burba | Scott Erickson | Dave Burba | Scott Erickson | | 185 | 165 | 20 |
| 1998-05-07 | @ TEX | 32 | W 7-2 | 20-12 | 1 | 28,504 | Bartolo Colon | Aaron Sele | Bartolo Colon | Aaron Sele | | 192 | 167 | 25 |
| 1998-05-08 | @ TEX | 33 | L 3-6 | 20-13 | 1 | 38,067 | Chad Ogea | Rick Helling | Xavier Hernandez | Jose Mesa | John Wetteland | 195 | 173 | 22 |
| 1998-05-09 | @ TEX | 34 | L 3-7 | 20-14 | 1 | 46,355 | Charles Nagy | Darren Oliver | Darren Oliver | Charles Nagy | | 198 | 180 | 18 |
| 1998-05-10 | @ TEX | 35 | L 3-5 | 20-15 | 1 | 31,232 | Jaret Wright | John Burkett | John Burkett | Jaret Wright | John Wetteland | 201 | 185 | 16 |
| 1998-05-11 | @ TBA | 36 | L 2-4 | 20-16 | 1 | 30,334 | Dave Burba | Rolando Arrojo | Rolando Arrojo | Dave Burba | Roberto Hernandez | 203 | 189 | 14 |
| 1998-05-12 | @ TBA | 37 | L 5-6 | 20-17 | 1 | 30,194 | Bartolo Colon | Jason Johnson | Julio Santana | Michael Jackson | | 208 | 195 | 13 |
| 1998-05-13 | @ BAL | 38 | L 1-8 | 20-18 | 1 | 43,379 | Chad Ogea | Doug Drabek | Doug Drabek | Chad Ogea | | 209 | 203 | 6 |
| 1998-05-14 | @ BAL | 39 | W 5-4 | 21-18 | 1 | 43,039 | Charles Nagy | Mike Mussina | Charles Nagy | Arthur Rhodes | Michael Jackson | 214 | 207 | 7 |
| 1998-05-15 | vs TEX | 40 | W 3-2 | 22-18 | 1 | 41,128 | Jaret Wright | John Burkett | Rick Krivda | Al Levine | | 217 | 209 | 8 |
| 1998-05-16 | vs TEX | 41 | W 10-3 | 23-18 | 1 | 40,925 | Dave Burba | Bobby Witt | Dave Burba | Bobby Witt | | 227 | 212 | 15 |
| 1998-05-17 | vs TEX | 42 | L 0-1 | 23-19 | 1 | 42,247 | Bartolo Colon | Aaron Sele | Aaron Sele | Bartolo Colon | John Wetteland | 227 | 213 | 14 |
| 1998-05-19 | @ KCA | 43 | W 16-3 | 24-19 | 1 | 13,367 | Chad Ogea | Pat Rapp | Chad Ogea | Pat Rapp | | 243 | 216 | 27 |
| 1998-05-20 | @ KCA | 44 | W 14-5 | 25-19 | 1 | 13,575 | Charles Nagy | Tim Belcher | Charles Nagy | Tim Belcher | | 257 | 221 | 36 |
| 1998-05-21 | @ KCA | 45 | W 6-2 | 26-19 | 1 | 17,243 | Jaret Wright | Jose Rosado | Jaret Wright | Jose Rosado | | 263 | 223 | 40 |
| 1998-05-22 | vs TOR | 46 | W 9-7 | 27-19 | 1 | 43,269 | Dave Burba | Erik Hanson | Dave Burba | Erik Hanson | Michael Jackson | 272 | 230 | 42 |
| 1998-05-23 | vs TOR | 47 | L 2-7 | 27-20 | 1 | 43,306 | Bartolo Colon | Roger Clemens | Roger Clemens | Bartolo Colon | | 274 | 237 | 37 |
| 1998-05-24 | vs TOR | 48 | L 0-5 | 27-21 | 1 | 43,194 | Dwight Gooden | Woody Williams | Woody Williams | Dwight Gooden | | 274 | 242 | 32 |
| 1998-05-25 | vs DET | 49 | W 7-4 | 28-21 | 1 | 43,342 | Charles Nagy | Frank Castillo | Charles Nagy | Frank Castillo | | 281 | 246 | 35 |
| 1998-05-26 | vs DET | 50 | W 9-2 | 29-21 | 1 | 42,372 | Jaret Wright | Tim Worrell | Jaret Wright | Tim Worrell | | 290 | 248 | 42 |
| 1998-05-28 | @ TOR | 51 | W 6-2 | 30-21 | 1 | 30,282 | Dave Burba | Chris Carpenter | Dave Burba | Chris Carpenter | | 296 | 250 | 46 |
| 1998-05-29 | @ TOR | 52 | W 7-3 | 31-21 | 1 | 29,085 | Bartolo Colon | Roger Clemens | Bartolo Colon | Roger Clemens | | 303 | 253 | 50 |
| 1998-05-30 | @ TOR | 53 | L 2-4 | 31-22 | 1 | 37,179 | Dwight Gooden | Woody Williams | Woody Williams | Dwight Gooden | Randy Myers | 305 | 257 | 48 |
| 1998-05-31 | @ TOR | 54 | W 8-3 | 32-22 | 1 | 30,090 | Charles Nagy | Pat Hentgen | Charles Nagy | Pat Hentgen | Jose Mesa | 313 | 260 | 53 |
| 1998-06-01 | @ DET | 55 | W 2-0 | 33-22 | 1 | 18,230 | Jaret Wright | Bryce Florie | Jaret Wright | Bryce Florie | | 315 | 260 | 55 |
| 1998-06-02 | @ DET | 56 | W 8-3 | 34-22 | 1 | 16,351 | Dave Burba | Justin Thompson | Dave Burba | Justin Thompson | | 323 | 263 | 60 |
| 1998-06-03 | @ MIN | 57 | L 2-3 | 34-23 | 1 | 8,897 | Bartolo Colon | LaTroy Hawkins | Greg Swindell | Bartolo Colon | Rick Aguilera | 325 | 266 | 59 |
| 1998-06-04 | @ MIN | 58 | W 3-2 | 35-23 | 1 | 9,417 | Dwight Gooden | Brad Radke | Dwight Gooden | Brad Radke | Michael Jackson | 328 | 268 | 60 |
| 1998-06-05 | @ CIN | 59 | L 1-2 | 35-24 | 1 | 43,532 | Charles Nagy | Pete Harnisch | Pete Harnisch | Charles Nagy | Jeff Shaw | 329 | 270 | 59 |
| 1998-06-06 | @ CIN | 60 | W 10-1 | 36-24 | 1 | 51,796 | Jaret Wright | Mike Remlinger | Jaret Wright | Mike Remlinger | | 339 | 271 | 68 |
| 1998-06-07 | @ CIN | 61 | W 6-1 | 37-24 | 1 | 49,589 | Dave Burba | Scott Klingenbeck | Dave Burba | Scott Klingenbeck | | 345 | 272 | 73 |
| 1998-06-08 | vs PIT | 62 | W 8-0 | 38-24 | 1 | 43,068 | Bartolo Colon | Chris Peters | Bartolo Colon | Chris Peters | | 353 | 272 | 81 |
| 1998-06-09 | vs PIT | 63 | L 4-7 | 38-25 | 1 | 41,762 | Dwight Gooden | Jon Lieber | Jon Lieber | Alvin Morman | Ricardo Rincon | 357 | 279 | 78 |
| 1998-06-10 | vs PIT | 64 | L 3-4 | 38-26 | 1 | 43,101 | Charles Nagy | Jose Silva | Esteban Loaiza | Jose Mesa | Rich Loiselle | 360 | 283 | 77 |
| 1998-06-14 | @ NYA | 65 | L 2-4 | 38-27 | 1 | 42,949 | Jaret Wright | David Cone | David Cone | Jaret Wright | Mariano Rivera | 362 | 287 | 75 |
| 1998-06-15 | vs KCA | 66 | L 6-7 | 38-28 | 1 | 43,246 | Dave Burba | Tim Belcher | Jeff Montgomery | Jose Mesa | Matt Whisenant | 368 | 294 | 74 |
| 1998-06-16 | vs KCA | 67 | W 9-1 | 39-28 | 1 | 43,184 | Bartolo Colon | Hipolito Pichardo | Bartolo Colon | Hipolito Pichardo | | 377 | 295 | 82 |
| 1998-06-17 | vs KCA | 68 | L 3-4 | 39-29 | 1 | 43,196 | Dwight Gooden | Jose Rosado | Jose Rosado | Dwight Gooden | Jeff Montgomery | 380 | 299 | 81 |
| 1998-06-18 | vs NYA | 69 | L 2-5 | 39-30 | 1 | 43,096 | Charles Nagy | Orlando Hernandez | Jeff Nelson | Paul Assenmacher | Mariano Rivera | 382 | 304 | 78 |
| 1998-06-19 | vs NYA | 70 | W 7-4 | 40-30 | 1 | 43,180 | Jaret Wright | David Cone | Jaret Wright | David Cone | Michael Jackson | 389 | 308 | 81 |
| 1998-06-20 | vs NYA | 71 | L 3-5 | 40-31 | 1 | 43,259 | Dave Burba | David Wells | David Wells | Dave Burba | Mariano Rivera | 392 | 313 | 79 |
| 1998-06-21 | vs NYA | 72 | W 11-0 | 41-31 | 1 | 43,104 | Bartolo Colon | Hideki Irabu | Bartolo Colon | Hideki Irabu | | 403 | 313 | 90 |
| 1998-06-22 | @ CHN | 73 | W 3-1 | 42-31 | 1 | 39,556 | Dwight Gooden | Kevin Tapani | Dwight Gooden | Kevin Tapani | Michael Jackson | 406 | 314 | 92 |
| 1998-06-23 | @ CHN | 74 | W 5-4 | 43-31 | 1 | 39,006 | Charles Nagy | Geremi Gonzalez | Eric Plunk | Terry Adams | Michael Jackson | 411 | 318 | 93 |
| 1998-06-24 | vs SLN | 75 | W 14-3 | 44-31 | 1 | 43,321 | Jaret Wright | Mark Petkovsek | Jaret Wright | Mark Petkovsek | | 425 | 321 | 104 |
| 1998-06-25 | vs SLN | 76 | W 8-2 | 45-31 | 1 | 43,309 | Dave Burba | Manny Aybar | Dave Burba | Manny Aybar | | 433 | 323 | 110 |
| 1998-06-26 | vs HOU | 77 | W 4-2 | 46-31 | 1 | 43,222 | Bartolo Colon | Pete Schourek | Bartolo Colon | Mike Magnante | Michael Jackson | 437 | 325 | 112 |
| 1998-06-27 | vs HOU | 78 | L 5-9 | 46-32 | 1 | 43,132 | Dwight Gooden | Jose Lima | Billy Wagner | Jose Mesa | | 442 | 334 | 108 |
| 1998-06-28 | vs HOU | 79 | L 3-12 | 46-33 | 1 | 43,047 | Charles Nagy | Shane Reynolds | Shane Reynolds | Charles Nagy | C.J. Nitkowski | 445 | 346 | 99 |
| 1998-06-30 | @ MIL | 80 | L 4-5 | 46-34 | 1 | 16,012 | Jaret Wright | Cal Eldred | Cal Eldred | Jaret Wright | Bob Wickman | 449 | 351 | 98 |
| 1998-07-01 | @ MIL | 81 | W 5-2 | 47-34 | 1 | 19,558 | Dave Burba | Jeff Juden | Dave Burba | Jeff Juden | Michael Jackson | 454 | 353 | 101 |
| 1998-07-02 | @ MIL | 82 | W 7-2 | 48-34 | 1 | 21,022 | Bartolo Colon | Brad Woodall | Bartolo Colon | Brad Woodall | | 461 | 355 | 106 |
| 1998-07-03 | @ KCA | 83 | W 2-1 | 49-34 | 1 | 27,661 | Dwight Gooden | Jose Rosado | Paul Shuey | Jose Rosado | Michael Jackson | 463 | 356 | 107 |
| 1998-07-04 | @ KCA | 84 | L 3-5 | 49-35 | 1 | 34,270 | Charles Nagy | Pat Rapp | Pat Rapp | Charles Nagy | Jeff Montgomery | 466 | 361 | 105 |
| 1998-07-05 | @ KCA | 85 | W 12-3 | 50-35 | 1 | 15,507 | Jaret Wright | Glendon Rusch | Jaret Wright | Glendon Rusch | | 478 | 364 | 114 |
| 1998-07-09 | vs MIN | 86 | L 0-3 | 50-36 | 1 | 43,236 | Dave Burba | Bob Tewksbury | Bob Tewksbury | Dave Burba | Rick Aguilera | 478 | 367 | 111 |
| 1998-07-10 | vs MIN | 87 | W 6-5 | 51-36 | 1 | 43,182 | Bartolo Colon | LaTroy Hawkins | Michael Jackson | Mike Trombley | | 484 | 372 | 112 |
| 1998-07-11 | vs MIN | 88 | W 12-2 | 52-36 | 1 | 43,140 | Dwight Gooden | Brad Radke | Dwight Gooden | Brad Radke | | 496 | 374 | 122 |
| 1998-07-12 | vs MIN | 89 | L 6-11 | 52-37 | 1 | 43,053 | Charles Nagy | Eric Milton | Eric Milton | Charles Nagy | | 502 | 385 | 117 |
| 1998-07-13 | vs NYA | 90 | W 4-1 | 53-37 | 1 | 43,177 | Jaret Wright | Orlando Hernandez | Jaret Wright | Orlando Hernandez | Michael Jackson | 506 | 386 | 120 |
| 1998-07-14 | vs NYA | 91 | L 1-7 | 53-38 | 1 | 43,164 | Dave Burba | Andy Pettitte | Andy Pettitte | Dave Burba | | 507 | 393 | 114 |
| 1998-07-15 | @ BOS | 92 | L 0-1 | 53-39 | 1 | 33,501 | Bartolo Colon | Pedro Martinez | Pedro Martinez | Bartolo Colon | | 507 | 394 | 113 |
| 1998-07-16 | @ BOS | 93 | L 5-15 | 53-40 | 1 | 33,568 | Dwight Gooden | Tim Wakefield | Tim Wakefield | Dwight Gooden | Derek Lowe | 512 | 409 | 103 |
| 1998-07-17 | @ CHA | 94 | L 3-4 | 53-41 | 1 | 27,733 | Charles Nagy | Jim Parque | Bill Simas | Paul Shuey | | 515 | 413 | 102 |
| 1998-07-18 | @ CHA | 95 | W 15-9 | 54-41 | 1 | 26,067 | Jaret Wright | John Snyder | Paul Shuey | Matt Karchner | Michael Jackson | 530 | 422 | 108 |
| 1998-07-19 | @ CHA | 96 | L 1-8 | 54-42 | 1 | 23,543 | Dave Burba | Mike Sirotka | Mike Sirotka | Dave Burba | | 531 | 430 | 101 |
| 1998-07-20 | @ CHA | 97 | W 5-4 | 55-42 | 1 | 27,160 | Bartolo Colon | Jaime Navarro | Bartolo Colon | Jaime Navarro | Michael Jackson | 536 | 434 | 102 |
| 1998-07-21 | vs BOS | 98 | L 7-10 | 56-43 | 1 | 42,874 | Dwight Gooden | Pedro Martinez | Pedro Martinez | Dwight Gooden | Tom Gordon | 543 | 444 | 99 |
| 1998-07-21 | vs BOS | 99 | W 4-2 | 56-43 | 1 | 43,227 | Chad Ogea | Tim Wakefield | Chad Ogea | Tim Wakefield | Michael Jackson | 547 | 446 | 101 |
| 1998-07-22 | vs BOS | 100 | W 4-3 | 57-43 | 1 | 43,073 | Charles Nagy | John Wasdin | Charles Nagy | Rich Garces | Michael Jackson | 551 | 449 | 102 |
| 1998-07-23 | vs DET | 101 | L 2-3 | 57-44 | 1 | 43,085 | Jaret Wright | Frank Castillo | Frank Castillo | Jaret Wright | Todd Jones | 553 | 452 | 101 |
| 1998-07-24 | vs DET | 102 | W 2-1 | 58-44 | 1 | 43,156 | Dave Burba | Justin Thompson | Steve Reed | Doug Bochtler | | 555 | 453 | 102 |
| 1998-07-25 | vs DET | 103 | W 6-5 | 59-44 | 1 | 43,094 | Bartolo Colon | Seth Greisinger | Bartolo Colon | Seth Greisinger | Michael Jackson | 561 | 458 | 103 |
| 1998-07-26 | vs DET | 104 | L 1-8 | 59-45 | 1 | 43,055 | Dwight Gooden | Brian Moehler | Brian Moehler | Dwight Gooden | | 562 | 466 | 96 |
| 1998-07-28 | @ SEA | 105 | W 4-3 | 60-45 | 1 | 31,124 | Charles Nagy | Randy Johnson | Charles Nagy | Randy Johnson | Michael Jackson | 566 | 469 | 97 |
| 1998-07-29 | @ SEA | 106 | W 8-7 | 61-45 | 1 | 25,953 | Jaret Wright | Ken Cloude | Chad Ogea | Greg McCarthy | Michael Jackson | 574 | 476 | 98 |
| 1998-07-30 | @ SEA | 107 | W 9-8 | 62-45 | 1 | 31,081 | Dave Burba | Bill Swift | Paul Shuey | Bob Wells | | 583 | 484 | 99 |
| 1998-07-31 | @ OAK | 108 | L 2-12 | 62-46 | 1 | 14,096 | Bartolo Colon | Tom Candiotti | Tom Candiotti | Bartolo Colon | | 585 | 496 | 89 |
| 1998-08-01 | @ OAK | 109 | L 5-6 | 62-47 | 1 | 48,241 | Dwight Gooden | Blake Stein | T.J. Mathews | Steve Karsay | | 590 | 502 | 88 |
| 1998-08-02 | @ OAK | 110 | L 5-7 | 62-48 | 1 | 27,712 | Charles Nagy | Jimmy Haynes | Mike Mohler | Charles Nagy | Billy Taylor | 595 | 509 | 86 |
| 1998-08-03 | @ ANA | 111 | L 4-11 | 62-49 | 1 | 25,339 | Jaret Wright | Steve Sparks | Steve Sparks | Jaret Wright | | 599 | 520 | 79 |
| 1998-08-04 | @ ANA | 112 | L 4-5 | 62-50 | 1 | 29,916 | Dave Burba | Chuck Finley | Shigetoshi Hasegawa | Doug Jones | Troy Percival | 603 | 525 | 78 |
| 1998-08-05 | @ ANA | 113 | W 6-5 | 63-50 | 1 | 43,104 | Bartolo Colon | Omar Olivares | Paul Shuey | Troy Percival | Paul Assenmacher | 609 | 530 | 79 |
| 1998-08-07 | @ TBA | 114 | W 5-1 | 64-50 | 1 | 32,254 | Dwight Gooden | Wilson Alvarez | Dwight Gooden | Wilson Alvarez | | 614 | 531 | 83 |
| 1998-08-08 | @ TBA | 115 | W 6-2 | 65-50 | 1 | 37,108 | Charles Nagy | Bryan Rekar | Charles Nagy | Bryan Rekar | | 620 | 533 | 87 |
| 1998-08-09 | @ TBA | 116 | L 1-2 | 65-51 | 1 | 36,641 | Jaret Wright | Rolando Arrojo | Jim Mecir | Paul Assenmacher | | 621 | 535 | 86 |
| 1998-08-11 | vs TEX | 117 | L 1-2 | 65-52 | 1 | 42,992 | Steve Karsay | Esteban Loaiza | Esteban Loaiza | Steve Karsay | John Wetteland | 622 | 537 | 85 |
| 1998-08-12 | vs TEX | 118 | W 6-3 | 66-52 | 1 | 43,247 | Bartolo Colon | John Burkett | Bartolo Colon | John Burkett | Michael Jackson | 628 | 540 | 88 |
| 1998-08-13 | vs BAL | 119 | L 4-7 | 66-53 | 1 | 43,217 | Dwight Gooden | Sidney Ponson | Pete Smith | Steve Reed | Armando Benitez | 632 | 547 | 85 |
| 1998-08-14 | vs BAL | 120 | L 3-15 | 66-54 | 1 | 43,169 | Charles Nagy | Mike Mussina | Mike Mussina | Charles Nagy | | 635 | 562 | 73 |
| 1998-08-15 | vs BAL | 121 | L 8-9 | 66-55 | 1 | 43,238 | Dave Burba | Juan Guzman | Armando Benitez | Doug Jones | | 643 | 571 | 72 |
| 1998-08-16 | vs BAL | 122 | W 5-3 | 67-55 | 1 | 43,069 | Jaret Wright | Scott Kamieniecki | Jaret Wright | Scott Kamieniecki | Michael Jackson | 648 | 574 | 74 |
| 1998-08-17 | vs TBA | 123 | W 4-3 | 68-55 | 1 | 43,139 | Bartolo Colon | Wilson Alvarez | Bartolo Colon | Wilson Alvarez | Michael Jackson | 652 | 577 | 75 |
| 1998-08-18 | vs TBA | 124 | W 4-2 | 69-55 | 1 | 42,967 | Dwight Gooden | Bryan Rekar | Dwight Gooden | Bryan Rekar | Michael Jackson | 656 | 579 | 77 |
| 1998-08-19 | @ TEX | 125 | L 1-3 | 69-56 | 1 | 26,146 | Charles Nagy | Aaron Sele | Aaron Sele | Charles Nagy | John Wetteland | 657 | 582 | 75 |
| 1998-08-20 | @ TEX | 126 | L 2-8 | 69-57 | 1 | 37,094 | Dave Burba | Todd Stottlemyre | Todd Stottlemyre | Dave Burba | Danny Patterson | 659 | 590 | 69 |
| 1998-08-21 | @ BAL | 127 | W 6-3 | 70-57 | 1 | 48,374 | Jaret Wright | Scott Kamieniecki | Jaret Wright | Scott Kamieniecki | | 665 | 593 | 72 |
| 1998-08-22 | @ BAL | 128 | L 3-6 | 70-58 | 1 | 48,138 | Bartolo Colon | Scott Erickson | Scott Erickson | Bartolo Colon | | 668 | 599 | 69 |
| 1998-08-23 | @ BAL | 129 | W 4-1 | 71-58 | 1 | 48,272 | Dwight Gooden | Sidney Ponson | Dwight Gooden | Sidney Ponson | Michael Jackson | 672 | 600 | 72 |
| 1998-08-25 | vs SEA | 130 | W 10-4 | 72-58 | 1 | 43,113 | Charles Nagy | Bill Swift | Charles Nagy | Bill Swift | | 682 | 604 | 78 |
| 1998-08-26 | vs SEA | 131 | W 5-3 | 73-58 | 1 | 43,091 | Dave Burba | Jeff Fassero | Dave Burba | Jeff Fassero | Michael Jackson | 687 | 607 | 80 |
| 1998-08-27 | vs SEA | 132 | L 4-10 | 73-59 | 1 | 43,142 | Jaret Wright | Jamie Moyer | Jamie Moyer | Jaret Wright | | 691 | 617 | 74 |
| 1998-08-28 | vs OAK | 133 | L 6-14 | 73-60 | 1 | 43,191 | Bartolo Colon | Mike Oquist | Gil Heredia | Steve Reed | | 697 | 631 | 66 |
| 1998-08-29 | vs OAK | 134 | L 6-11 | 73-61 | 1 | 43,020 | Dwight Gooden | Jimmy Haynes | Jimmy Haynes | Tom Martin | Billy Taylor | 703 | 642 | 61 |
| 1998-08-30 | vs OAK | 135 | W 9-4 | 74-61 | 1 | 42,951 | Charles Nagy | Kenny Rogers | Charles Nagy | Kenny Rogers | Michael Jackson | 712 | 646 | 66 |
| 1998-08-31 | vs OAK | 136 | W 15-6 | 75-61 | 1 | 42,897 | Dave Burba | Blake Stein | Dave Burba | Blake Stein | Doug Jones | 727 | 652 | 75 |
| 1998-09-01 | vs ANA | 137 | W 7-6 | 76-61 | 1 | 43,184 | Jaret Wright | Chuck Finley | Steve Reed | Rich DeLucia | | 734 | 658 | 76 |
| 1998-09-02 | vs ANA | 138 | L 5-13 | 76-62 | 1 | 43,200 | Bartolo Colon | Steve Sparks | Steve Sparks | Bartolo Colon | | 739 | 671 | 68 |
| 1998-09-03 | @ DET | 139 | W 2-1 | 77-62 | 1 | 14,605 | Dwight Gooden | Justin Thompson | Dwight Gooden | Justin Thompson | Michael Jackson | 741 | 672 | 69 |
| 1998-09-04 | @ DET | 140 | W 10-2 | 78-62 | 1 | 23,139 | Charles Nagy | Seth Greisinger | Charles Nagy | Seth Greisinger | | 751 | 674 | 77 |
| 1998-09-05 | @ DET | 141 | W 5-4 | 79-62 | 1 | 30,031 | Dave Burba | Brian Powell | Dave Burba | Brian Powell | Michael Jackson | 756 | 678 | 78 |
| 1998-09-06 | @ DET | 142 | L 2-3 | 79-63 | 1 | 32,815 | Jaret Wright | Bryce Florie | Bryce Florie | Jaret Wright | Todd Jones | 758 | 681 | 77 |
| 1998-09-07 | @ TOR | 143 | L 1-15 | 79-64 | 1 | 31,089 | Chad Ogea | Kelvim Escobar | Kelvim Escobar | Chad Ogea | | 759 | 696 | 63 |
| 1998-09-09 | @ TOR | 144 | W 6-3 | 80-64 | 1 | 32,157 | Dwight Gooden | Woody Williams | Doug Jones | Carlos Almanzar | Michael Jackson | 765 | 699 | 66 |
| 1998-09-11 | vs CHA | 145 | L 2-3 | 80-65 | 1 | 43,210 | Charles Nagy | Jim Abbott | Jim Abbott | Charles Nagy | Bob Howry | 767 | 702 | 65 |
| 1998-09-12 | vs CHA | 146 | L 4-6 | 80-66 | 1 | 43,170 | Dave Burba | James Baldwin | James Baldwin | Paul Shuey | Bob Howry | 771 | 708 | 63 |
| 1998-09-13 | vs CHA | 147 | W 6-3 | 81-66 | 1 | 43,178 | Jaret Wright | Jim Parque | Paul Shuey | Bryan Ward | Michael Jackson | 777 | 711 | 66 |
| 1998-09-14 | vs TOR | 148 | W 6-3 | 82-66 | 1 | 43,152 | Dwight Gooden | Woody Williams | Dwight Gooden | Steve Sinclair | Michael Jackson | 783 | 714 | 69 |
| 1998-09-15 | vs TOR | 149 | W 7-5 | 83-66 | 1 | 43,323 | Bartolo Colon | Dave Stieb | Chad Ogea | Dave Stieb | Paul Assenmacher | 790 | 719 | 71 |
| 1998-09-16 | vs MIN | 150 | W 8-6 | 84-66 | 1 | 43,277 | Charles Nagy | Bob Tewksbury | Charles Nagy | Bob Tewksbury | Paul Assenmacher | 798 | 725 | 73 |
| 1998-09-17 | vs MIN | 151 | W 9-1 | 85-66 | 1 | 43,299 | Dave Burba | Eric Milton | Dave Burba | Eric Milton | | 807 | 726 | 81 |
| 1998-09-18 | vs KCA | 152 | W 4-1 | 86-66 | 1 | 43,260 | Jaret Wright | Kevin Appier | Jaret Wright | Kevin Appier | Paul Shuey | 811 | 727 | 84 |
| 1998-09-19 | vs KCA | 153 | L 6-7 | 86-67 | 1 | 43,182 | Dwight Gooden | Jose Rosado | Scott Service | Paul Shuey | Jeff Montgomery | 817 | 734 | 83 |
| 1998-09-20 | vs KCA | 154 | W 5-3 | 87-67 | 1 | 43,082 | Bartolo Colon | Pat Rapp | Bartolo Colon | Pat Rapp | Michael Jackson | 822 | 737 | 85 |
| 1998-09-21 | @ NYA | 155 | W 4-1 | 88-67 | 1 | 21,449 | Charles Nagy | Andy Pettitte | Charles Nagy | Andy Pettitte | Paul Shuey | 826 | 738 | 88 |
| 1998-09-22 | @ NYA | 156 | L 4-10 | 88-69 | 1 | 14,840 | Dave Burba | Ramiro Mendoza | Ramiro Mendoza | Dave Burba | | 830 | 748 | 82 |
| 1998-09-22 | @ NYA | 157 | L 1-5 | 88-69 | 1 | 32,315 | Chad Ogea | Hideki Irabu | Hideki Irabu | Chad Ogea | | 831 | 753 | 78 |
| 1998-09-23 | @ NYA | 158 | L 4-8 | 88-70 | 1 | 32,367 | Jason Jacome | Mike Jerzembeck | Ryan Bradley | Jason Jacome | | 835 | 761 | 74 |
| 1998-09-24 | @ MIN | 159 | L 0-2 | 88-71 | 1 | 7,800 | Jaret Wright | Brad Radke | Brad Radke | Jaret Wright | Rick Aguilera | 835 | 763 | 72 |
| 1998-09-25 | @ MIN | 160 | L 4-5 | 88-72 | 1 | 11,940 | Dwight Gooden | Benj Sampson | Rick Aguilera | Paul Shuey | | 839 | 768 | 71 |
| 1998-09-26 | @ MIN | 161 | W 9-5 | 89-72 | 1 | 28,764 | Charles Nagy | Bob Tewksbury | Dave Burba | Bob Tewksbury | | 848 | 773 | 75 |
| 1998-09-27 | @ MIN | 162 | L 2-6 | 89-73 | 1 | 12,049 | Bartolo Colon | Eric Milton | Eric Milton | Bartolo Colon | Mike Trombley | 850 | 779 | 71 |