| 1998-04-01 | @ ANA | 1 | L 1-4 | 0-1 | 5 | 43,311 | Andy Pettitte | Chuck Finley | Chuck Finley | Andy Pettitte | Troy Percival | 1 | 4 | -3 |
| 1998-04-02 | @ ANA | 2 | L 2-10 | 0-2 | 5 | 29,899 | David Wells | Ken Hill | Ken Hill | David Wells | | 3 | 14 | -11 |
| 1998-04-04 | @ OAK | 3 | L 3-7 | 0-3 | 5 | 17,118 | David Cone | Jimmy Haynes | Jimmy Haynes | David Cone | | 6 | 21 | -15 |
| 1998-04-05 | @ OAK | 4 | W 9-7 | 1-3 | 5 | 18,109 | Ramiro Mendoza | Mike Oquist | Jeff Nelson | Mike Mohler | | 15 | 28 | -13 |
| 1998-04-06 | @ SEA | 5 | L 0-8 | 1-4 | 5 | 27,445 | Andy Pettitte | Jamie Moyer | Jamie Moyer | Andy Pettitte | | 15 | 36 | -21 |
| 1998-04-07 | @ SEA | 6 | W 13-7 | 2-4 | 4 | 28,424 | David Wells | Jim Bullinger | David Wells | Jim Bullinger | | 28 | 43 | -15 |
| 1998-04-08 | @ SEA | 7 | W 4-3 | 3-4 | 3 | 33,922 | Hideki Irabu | Ken Cloude | Graeme Lloyd | Bobby Ayala | Mike Stanton | 32 | 46 | -14 |
| 1998-04-10 | vs OAK | 8 | W 17-13 | 4-4 | 2 | 56,717 | David Cone | Jimmy Haynes | Mike Buddie | Jim Dougherty | | 49 | 59 | -10 |
| 1998-04-11 | vs OAK | 9 | W 3-1 | 5-4 | 2 | 33,238 | Andy Pettitte | Tom Candiotti | Andy Pettitte | Tom Candiotti | Mike Stanton | 52 | 60 | -8 |
| 1998-04-12 | vs OAK | 10 | W 7-5 | 6-4 | 2 | 27,057 | Ramiro Mendoza | Mike Oquist | Mike Buddie | T.J. Mathews | Mike Stanton | 59 | 65 | -6 |
| 1998-04-15 | vs ANA | 11 | W 6-3 | 7-4 | 3 | 40,743 | David Wells | Ken Hill | David Wells | Ken Hill | Jeff Nelson | 65 | 68 | -3 |
| 1998-04-17 | @ DET | 12 | W 11-2 | 8-4 | 3 | 12,348 | Andy Pettitte | Justin Thompson | Andy Pettitte | Justin Thompson | | 76 | 70 | 6 |
| 1998-04-18 | @ DET | 13 | W 8-3 | 9-4 | 1 | 13,803 | David Cone | Greg Keagle | David Cone | Greg Keagle | | 84 | 73 | 11 |
| 1998-04-19 | @ DET | 14 | L 1-2 | 9-5 | 3 | 12,568 | Hideki Irabu | Brian Moehler | Brian Moehler | Darren Holmes | Todd Jones | 85 | 75 | 10 |
| 1998-04-20 | @ TOR | 15 | W 3-2 | 10-5 | 2 | 26,385 | David Wells | Woody Williams | Willie Banks | Bill Risley | Mike Stanton | 88 | 77 | 11 |
| 1998-04-21 | @ TOR | 16 | W 5-3 | 11-5 | 1 | 27,192 | Ramiro Mendoza | Erik Hanson | Mike Stanton | Dan Plesac | | 93 | 80 | 13 |
| 1998-04-22 | @ TOR | 17 | W 9-1 | 12-5 | 1 | 29,164 | Andy Pettitte | Roger Clemens | Andy Pettitte | Roger Clemens | | 102 | 81 | 21 |
| 1998-04-24 | vs DET | 18 | W 8-4 | 13-5 | 1 | 26,173 | David Cone | Greg Keagle | David Cone | Greg Keagle | | 110 | 85 | 25 |
| 1998-04-25 | vs DET | 19 | W 5-4 | 14-5 | 1 | 33,196 | David Wells | Brian Moehler | David Wells | Sean Runyan | Mariano Rivera | 115 | 89 | 26 |
| 1998-04-27 | vs TOR | 20 | W 1-0 | 15-5 | 1 | 17,863 | Andy Pettitte | Roger Clemens | Andy Pettitte | Roger Clemens | Mariano Rivera | 116 | 89 | 27 |
| 1998-04-28 | vs TOR | 21 | L 2-5 | 15-6 | 1 | 18,727 | Ramiro Mendoza | Woody Williams | Woody Williams | Ramiro Mendoza | Randy Myers | 118 | 94 | 24 |
| 1998-04-29 | vs SEA | 22 | W 8-5 | 16-6 | 1 | 27,949 | David Cone | Jeff Fassero | David Cone | Jeff Fassero | Mariano Rivera | 126 | 99 | 27 |
| 1998-04-30 | vs SEA | 23 | W 9-8 | 17-6 | 1 | 28,517 | David Wells | Ken Cloude | Mariano Rivera | Bobby Ayala | | 135 | 107 | 28 |
| 1998-05-01 | @ KCA | 24 | W 2-1 | 18-6 | 1 | 19,002 | Hideki Irabu | Pat Rapp | Hideki Irabu | Pat Rapp | Mariano Rivera | 137 | 108 | 29 |
| 1998-05-02 | @ KCA | 25 | W 12-6 | 19-6 | 1 | 22,743 | Andy Pettitte | Chris Haney | Andy Pettitte | Chris Haney | | 149 | 114 | 35 |
| 1998-05-03 | @ KCA | 26 | W 10-1 | 20-6 | 1 | 22,609 | Ramiro Mendoza | Tim Belcher | Ramiro Mendoza | Tim Belcher | | 159 | 115 | 44 |
| 1998-05-05 | @ TEX | 27 | W 7-2 | 21-6 | 1 | 31,693 | David Cone | John Burkett | David Cone | John Burkett | | 166 | 117 | 49 |
| 1998-05-06 | @ TEX | 28 | W 15-13 | 22-6 | 1 | 33,274 | David Wells | Bobby Witt | Mike Stanton | Danny Patterson | Mariano Rivera | 181 | 130 | 51 |
| 1998-05-08 | @ MIN | 29 | W 5-1 | 23-6 | 1 | 22,612 | Hideki Irabu | Brad Radke | Hideki Irabu | Brad Radke | Jeff Nelson | 186 | 131 | 55 |
| 1998-05-09 | @ MIN | 30 | L 1-8 | 23-7 | 1 | 20,471 | Andy Pettitte | Mike Morgan | Mike Morgan | Andy Pettitte | | 187 | 139 | 48 |
| 1998-05-10 | @ MIN | 31 | W 7-0 | 24-7 | 1 | 12,444 | Ramiro Mendoza | Eric Milton | Ramiro Mendoza | Eric Milton | | 194 | 139 | 55 |
| 1998-05-12 | vs KCA | 32 | W 3-2 | 25-7 | 1 | 16,606 | David Wells | Glendon Rusch | David Wells | Glendon Rusch | Mariano Rivera | 197 | 141 | 56 |
| 1998-05-13 | vs TEX | 33 | W 8-6 | 26-7 | 1 | 23,142 | David Cone | Rick Helling | David Cone | Rick Helling | Mariano Rivera | 205 | 147 | 58 |
| 1998-05-14 | vs TEX | 34 | L 5-7 | 26-8 | 1 | 20,694 | Hideki Irabu | Darren Oliver | Danny Patterson | Willie Banks | John Wetteland | 210 | 154 | 56 |
| 1998-05-15 | vs MIN | 35 | L 6-7 | 26-9 | 1 | 31,272 | Andy Pettitte | Eric Milton | Eric Milton | Andy Pettitte | Rick Aguilera | 216 | 161 | 55 |
| 1998-05-16 | vs MIN | 36 | W 5-2 | 27-9 | 1 | 35,137 | Ramiro Mendoza | Bob Tewksbury | Ramiro Mendoza | Bob Tewksbury | Mariano Rivera | 221 | 163 | 58 |
| 1998-05-17 | vs MIN | 37 | W 4-0 | 28-9 | 1 | 49,820 | David Wells | LaTroy Hawkins | David Wells | LaTroy Hawkins | | 225 | 163 | 62 |
| 1998-05-19 | vs BAL | 38 | W 9-5 | 29-9 | 1 | 31,311 | David Cone | Doug Johns | Mike Stanton | Norm Charlton | | 234 | 168 | 66 |
| 1998-05-20 | vs BAL | 39 | W 9-6 | 30-9 | 1 | 32,449 | Hideki Irabu | Jimmy Key | Hideki Irabu | Jimmy Key | | 243 | 174 | 69 |
| 1998-05-21 | vs BAL | 40 | W 3-1 | 31-9 | 1 | 34,588 | Andy Pettitte | Scott Erickson | Andy Pettitte | Scott Erickson | Mariano Rivera | 246 | 175 | 71 |
| 1998-05-22 | @ BOS | 41 | L 4-5 | 31-10 | 1 | 33,605 | Ramiro Mendoza | Tim Wakefield | Tim Wakefield | Jeff Nelson | Tom Gordon | 250 | 180 | 70 |
| 1998-05-23 | @ BOS | 42 | W 12-3 | 32-10 | 1 | 33,120 | David Wells | Derek Lowe | David Wells | Derek Lowe | | 262 | 183 | 79 |
| 1998-05-24 | @ BOS | 43 | W 14-4 | 33-10 | 1 | 33,042 | David Cone | Bret Saberhagen | David Cone | Bret Saberhagen | | 276 | 187 | 89 |
| 1998-05-25 | @ CHA | 44 | W 12-0 | 34-10 | 1 | 19,812 | Hideki Irabu | Jaime Navarro | Hideki Irabu | Jaime Navarro | | 288 | 187 | 101 |
| 1998-05-26 | @ CHA | 45 | W 7-5 | 35-10 | 1 | 14,596 | Andy Pettitte | Jim Parque | Jeff Nelson | Keith Foulke | Mariano Rivera | 295 | 192 | 103 |
| 1998-05-27 | @ CHA | 46 | L 9-12 | 35-11 | 1 | 15,232 | Ramiro Mendoza | Scott Eyre | Bill Simas | Jeff Nelson | Matt Karchner | 304 | 204 | 100 |
| 1998-05-28 | vs BOS | 47 | W 8-3 | 36-11 | 1 | 42,182 | David Wells | Tim Wakefield | David Wells | Tim Wakefield | Mike Stanton | 312 | 207 | 105 |
| 1998-05-29 | vs BOS | 48 | W 6-2 | 37-11 | 1 | 47,160 | David Cone | Derek Lowe | David Cone | Derek Lowe | | 318 | 209 | 109 |
| 1998-05-30 | vs BOS | 49 | L 2-3 | 37-12 | 1 | 55,191 | Hideki Irabu | Bret Saberhagen | Bret Saberhagen | Hideki Irabu | Tom Gordon | 320 | 212 | 108 |
| 1998-05-31 | vs BOS | 50 | L 7-13 | 37-13 | 1 | 55,711 | Andy Pettitte | Pedro Martinez | Pedro Martinez | Andy Pettitte | | 327 | 225 | 102 |
| 1998-06-01 | vs CHA | 51 | W 5-4 | 38-13 | 1 | 19,131 | Ramiro Mendoza | Scott Eyre | Jeff Nelson | Matt Karchner | | 332 | 229 | 103 |
| 1998-06-02 | vs CHA | 52 | W 6-3 | 39-13 | 1 | 22,599 | David Wells | Mike Sirotka | David Wells | Mike Sirotka | Mariano Rivera | 338 | 232 | 106 |
| 1998-06-03 | vs TBA | 53 | W 7-1 | 40-13 | 1 | 27,291 | Orlando Hernandez | Tony Saunders | Orlando Hernandez | Tony Saunders | | 345 | 233 | 112 |
| 1998-06-04 | vs TBA | 54 | W 6-1 | 41-13 | 1 | 22,759 | Hideki Irabu | Dennis Springer | Hideki Irabu | Dennis Springer | | 351 | 234 | 117 |
| 1998-06-05 | vs FLO | 55 | W 5-1 | 42-13 | 1 | 28,085 | Andy Pettitte | Joe Fontenot | Andy Pettitte | Joe Fontenot | | 356 | 235 | 121 |
| 1998-06-06 | vs FLO | 56 | W 4-2 | 43-13 | 1 | 36,419 | Ramiro Mendoza | Jesus Sanchez | Ramiro Mendoza | Jesus Sanchez | Mariano Rivera | 360 | 237 | 123 |
| 1998-06-07 | vs FLO | 57 | W 4-1 | 44-13 | 1 | 47,731 | David Cone | Ryan Dempster | David Cone | Ryan Dempster | | 364 | 238 | 126 |
| 1998-06-09 | @ MON | 58 | W 11-1 | 45-13 | 1 | 16,238 | Orlando Hernandez | Carlos Perez | Orlando Hernandez | Carlos Perez | | 375 | 239 | 136 |
| 1998-06-10 | @ MON | 59 | W 6-2 | 46-13 | 1 | 14,335 | Hideki Irabu | Dustin Hermanson | Hideki Irabu | Dustin Hermanson | | 381 | 241 | 140 |
| 1998-06-11 | @ MON | 60 | L 5-7 | 46-14 | 1 | 16,036 | Andy Pettitte | Carl Pavano | Marc Valdes | Jeff Nelson | Ugueth Urbina | 386 | 248 | 138 |
| 1998-06-14 | vs CLE | 61 | W 4-2 | 47-14 | 1 | 42,949 | David Cone | Jaret Wright | David Cone | Jaret Wright | Mariano Rivera | 390 | 250 | 140 |
| 1998-06-15 | @ BAL | 62 | L 4-7 | 47-15 | 1 | 48,022 | David Wells | Scott Erickson | Scott Erickson | David Wells | Jesse Orosco | 394 | 257 | 137 |
| 1998-06-16 | @ BAL | 63 | L 0-2 | 47-16 | 1 | 48,027 | Hideki Irabu | Sidney Ponson | Sidney Ponson | Hideki Irabu | Arthur Rhodes | 394 | 259 | 135 |
| 1998-06-17 | @ BAL | 64 | W 5-3 | 48-16 | 1 | 48,269 | Andy Pettitte | Mike Mussina | Andy Pettitte | Mike Mussina | Mariano Rivera | 399 | 262 | 137 |
| 1998-06-18 | @ CLE | 65 | W 5-2 | 49-16 | 1 | 43,096 | Orlando Hernandez | Charles Nagy | Jeff Nelson | Paul Assenmacher | Mariano Rivera | 404 | 264 | 140 |
| 1998-06-19 | @ CLE | 66 | L 4-7 | 49-17 | 1 | 43,180 | David Cone | Jaret Wright | Jaret Wright | David Cone | Michael Jackson | 408 | 271 | 137 |
| 1998-06-20 | @ CLE | 67 | W 5-3 | 50-17 | 1 | 43,259 | David Wells | Dave Burba | David Wells | Dave Burba | Mariano Rivera | 413 | 274 | 139 |
| 1998-06-21 | @ CLE | 68 | L 0-11 | 50-18 | 1 | 43,104 | Hideki Irabu | Bartolo Colon | Bartolo Colon | Hideki Irabu | | 413 | 285 | 128 |
| 1998-06-22 | vs ATL | 69 | W 6-4 | 51-18 | 1 | 53,316 | Andy Pettitte | Greg Maddux | Jeff Nelson | Dennis Martinez | Mariano Rivera | 419 | 289 | 130 |
| 1998-06-23 | vs ATL | 70 | L 2-7 | 51-19 | 1 | 54,775 | Orlando Hernandez | Tom Glavine | Tom Glavine | Orlando Hernandez | | 421 | 296 | 125 |
| 1998-06-24 | @ ATL | 71 | W 10-6 | 52-19 | 1 | 48,980 | David Cone | Kevin Millwood | David Cone | Kevin Millwood | Mariano Rivera | 431 | 302 | 129 |
| 1998-06-25 | @ ATL | 72 | W 6-0 | 53-19 | 1 | 49,052 | David Wells | Denny Neagle | David Wells | Denny Neagle | | 437 | 302 | 135 |
| 1998-06-26 | @ NYN | 73 | W 8-4 | 54-19 | 1 | 53,404 | Hideki Irabu | Al Leiter | Ramiro Mendoza | Al Leiter | Mariano Rivera | 445 | 306 | 139 |
| 1998-06-27 | @ NYN | 74 | W 7-2 | 55-19 | 1 | 53,587 | Andy Pettitte | Bobby Jones | Andy Pettitte | Bobby Jones | | 452 | 308 | 144 |
| 1998-06-28 | @ NYN | 75 | L 1-2 | 55-20 | 1 | 53,749 | Orlando Hernandez | Masato Yoshii | Dennis Cook | Ramiro Mendoza | | 453 | 310 | 143 |
| 1998-06-30 | vs PHI | 76 | W 9-2 | 56-20 | 1 | 29,087 | David Cone | Carlton Loewer | David Cone | Carlton Loewer | | 462 | 312 | 150 |
| 1998-07-01 | vs PHI | 77 | W 5-2 | 57-20 | 1 | 28,919 | David Wells | Matt Beech | David Wells | Matt Beech | Mariano Rivera | 467 | 314 | 153 |
| 1998-07-02 | vs PHI | 78 | W 9-8 | 58-20 | 1 | 31,259 | Hideki Irabu | Tyler Green | Mike Buddie | Jerry Spradlin | | 476 | 322 | 154 |
| 1998-07-03 | vs BAL | 79 | W 3-2 | 59-20 | 1 | 43,328 | Andy Pettitte | Mike Mussina | Andy Pettitte | Jesse Orosco | | 479 | 324 | 155 |
| 1998-07-04 | vs BAL | 80 | W 4-3 | 60-20 | 1 | 37,390 | Orlando Hernandez | Doug Drabek | Orlando Hernandez | Doug Drabek | Mariano Rivera | 483 | 327 | 156 |
| 1998-07-05 | vs BAL | 81 | W 1-0 | 61-20 | 1 | 52,506 | David Cone | Scott Erickson | David Cone | Scott Erickson | Mariano Rivera | 484 | 327 | 157 |
| 1998-07-09 | @ TBA | 82 | W 2-0 | 62-20 | 1 | 38,386 | Andy Pettitte | Bryan Rekar | Andy Pettitte | Bryan Rekar | Mariano Rivera | 486 | 327 | 159 |
| 1998-07-10 | @ TBA | 83 | W 8-4 | 63-20 | 1 | 40,363 | Hideki Irabu | Wilson Alvarez | Hideki Irabu | Wilson Alvarez | Ramiro Mendoza | 494 | 331 | 163 |
| 1998-07-11 | @ TBA | 84 | W 2-0 | 64-20 | 1 | 44,589 | David Cone | Rolando Arrojo | David Cone | Rolando Arrojo | Mariano Rivera | 496 | 331 | 165 |
| 1998-07-12 | @ TBA | 85 | W 9-2 | 65-20 | 1 | 43,373 | David Wells | Tony Saunders | Mike Stanton | Roberto Hernandez | | 505 | 333 | 172 |
| 1998-07-13 | @ CLE | 86 | L 1-4 | 65-21 | 1 | 43,177 | Orlando Hernandez | Jaret Wright | Jaret Wright | Orlando Hernandez | Michael Jackson | 506 | 337 | 169 |
| 1998-07-14 | @ CLE | 87 | W 7-1 | 66-21 | 1 | 43,164 | Andy Pettitte | Dave Burba | Andy Pettitte | Dave Burba | | 513 | 338 | 175 |
| 1998-07-15 | @ DET | 88 | W 11-0 | 67-21 | 1 | 19,868 | Hideki Irabu | Seth Greisinger | Hideki Irabu | Seth Greisinger | | 524 | 338 | 186 |
| 1998-07-16 | @ DET | 89 | L 1-3 | 67-22 | 1 | 21,336 | David Cone | Brian Moehler | Brian Moehler | David Cone | Todd Jones | 525 | 341 | 184 |
| 1998-07-17 | @ TOR | 90 | L 6-9 | 67-23 | 1 | 39,172 | Ramiro Mendoza | Roger Clemens | Roger Clemens | Darren Holmes | Randy Myers | 531 | 350 | 181 |
| 1998-07-18 | @ TOR | 91 | W 10-3 | 68-23 | 1 | 48,123 | Orlando Hernandez | Juan Guzman | Orlando Hernandez | Juan Guzman | | 541 | 353 | 188 |
| 1998-07-19 | @ TOR | 92 | L 3-9 | 68-24 | 1 | 42,176 | Andy Pettitte | Woody Williams | Woody Williams | Andy Pettitte | | 544 | 362 | 182 |
| 1998-07-20 | vs DET | 93 | L 3-4 | 69-25 | 1 | 0 | David Wells | Seth Greisinger | A.J. Sager | Darren Holmes | | 547 | 366 | 181 |
| 1998-07-20 | vs DET | 94 | W 4-3 | 69-25 | 1 | 36,285 | Hideki Irabu | Bryce Florie | Hideki Irabu | Bryce Florie | Mariano Rivera | 551 | 369 | 182 |
| 1998-07-21 | vs DET | 95 | W 5-1 | 70-25 | 1 | 35,980 | David Cone | Brian Moehler | David Cone | Brian Moehler | | 556 | 370 | 186 |
| 1998-07-22 | vs DET | 96 | W 13-2 | 71-25 | 1 | 49,029 | Orlando Hernandez | Brian Powell | Orlando Hernandez | Brian Powell | Darren Holmes | 569 | 372 | 197 |
| 1998-07-24 | vs CHA | 97 | W 5-4 | 72-25 | 1 | 44,264 | Andy Pettitte | John Snyder | Andy Pettitte | Bryan Ward | Mariano Rivera | 574 | 376 | 198 |
| 1998-07-25 | vs CHA | 98 | L 2-6 | 72-26 | 1 | 55,638 | Hideki Irabu | Mike Sirotka | Mike Sirotka | Hideki Irabu | Bill Simas | 576 | 382 | 194 |
| 1998-07-26 | vs CHA | 99 | W 6-3 | 73-26 | 1 | 51,865 | David Wells | Jaime Navarro | David Wells | Jaime Navarro | Mariano Rivera | 582 | 385 | 197 |
| 1998-07-28 | @ ANA | 100 | W 9-3 | 74-26 | 1 | 36,241 | David Cone | Jason Dickson | David Cone | Jason Dickson | | 591 | 388 | 203 |
| 1998-07-29 | @ ANA | 101 | L 5-10 | 74-27 | 1 | 38,829 | Orlando Hernandez | Steve Sparks | Steve Sparks | Orlando Hernandez | | 596 | 398 | 198 |
| 1998-07-30 | @ ANA | 102 | W 3-0 | 75-27 | 1 | 42,915 | Andy Pettitte | Chuck Finley | Ramiro Mendoza | Rich DeLucia | Mariano Rivera | 599 | 398 | 201 |
| 1998-07-31 | @ SEA | 103 | W 5-3 | 76-27 | 1 | 43,837 | Hideki Irabu | Jeff Fassero | Hideki Irabu | Jeff Fassero | Mariano Rivera | 604 | 401 | 203 |
| 1998-08-01 | @ SEA | 104 | W 5-2 | 77-27 | 1 | 53,840 | David Wells | Jamie Moyer | David Wells | Jamie Moyer | | 609 | 403 | 206 |
| 1998-08-02 | @ SEA | 105 | L 3-6 | 77-28 | 1 | 47,872 | David Cone | Paul Spoljaric | Bob Wells | David Cone | Mike Timlin | 612 | 409 | 203 |
| 1998-08-03 | @ OAK | 106 | W 14-1 | 78-28 | 1 | 18,209 | Orlando Hernandez | Mike Oquist | Orlando Hernandez | Mike Oquist | | 626 | 410 | 216 |
| 1998-08-04 | @ OAK | 107 | W 10-4 | 80-28 | 1 | 0 | Ramiro Mendoza | Jay Witasick | Ramiro Mendoza | Jay Witasick | Mike Stanton | 636 | 414 | 222 |
| 1998-08-04 | @ OAK | 108 | W 10-5 | 80-28 | 1 | 23,357 | Mike Buddie | Kenny Rogers | Graeme Lloyd | Billy Taylor | | 646 | 419 | 227 |
| 1998-08-05 | @ OAK | 109 | L 1-3 | 80-29 | 1 | 22,458 | Hideki Irabu | Tom Candiotti | Tom Candiotti | Hideki Irabu | | 647 | 422 | 225 |
| 1998-08-07 | vs KCA | 110 | W 8-2 | 82-29 | 1 | 14,425 | David Cone | Pat Rapp | David Cone | Pat Rapp | | 655 | 424 | 231 |
| 1998-08-07 | vs KCA | 111 | W 14-2 | 82-29 | 1 | 37,988 | David Wells | Chris Haney | David Wells | Chris Haney | | 669 | 426 | 243 |
| 1998-08-08 | vs KCA | 112 | W 14-1 | 83-29 | 1 | 45,975 | Orlando Hernandez | Glendon Rusch | Orlando Hernandez | Glendon Rusch | | 683 | 427 | 256 |
| 1998-08-09 | vs KCA | 113 | W 5-4 | 84-29 | 1 | 55,911 | Andy Pettitte | Hipolito Pichardo | Ramiro Mendoza | Scott Service | Mariano Rivera | 688 | 431 | 257 |
| 1998-08-10 | vs MIN | 114 | W 7-3 | 85-29 | 1 | 29,600 | Hideki Irabu | Frankie Rodriguez | Hideki Irabu | Frankie Rodriguez | | 695 | 434 | 261 |
| 1998-08-11 | vs MIN | 115 | W 7-0 | 86-29 | 1 | 37,413 | David Wells | Eric Milton | David Wells | Eric Milton | | 702 | 434 | 268 |
| 1998-08-12 | vs MIN | 116 | W 11-2 | 87-29 | 1 | 47,841 | David Cone | LaTroy Hawkins | David Cone | LaTroy Hawkins | | 713 | 436 | 277 |
| 1998-08-13 | vs TEX | 117 | W 2-0 | 88-29 | 1 | 53,835 | Orlando Hernandez | Rick Helling | Orlando Hernandez | Rick Helling | Mariano Rivera | 715 | 436 | 279 |
| 1998-08-14 | vs TEX | 118 | W 6-4 | 89-29 | 1 | 46,547 | Andy Pettitte | Aaron Sele | Andy Pettitte | Aaron Sele | Mariano Rivera | 721 | 440 | 281 |
| 1998-08-15 | vs TEX | 119 | L 5-16 | 89-30 | 1 | 53,117 | Hideki Irabu | Todd Stottlemyre | Todd Stottlemyre | Hideki Irabu | | 726 | 456 | 270 |
| 1998-08-16 | vs TEX | 120 | W 6-5 | 90-30 | 1 | 50,304 | David Wells | Esteban Loaiza | Mariano Rivera | Xavier Hernandez | | 732 | 461 | 271 |
| 1998-08-17 | @ KCA | 121 | W 7-1 | 91-30 | 1 | 27,895 | David Cone | Jose Rosado | David Cone | Jose Rosado | | 739 | 462 | 277 |
| 1998-08-18 | @ KCA | 122 | W 3-2 | 92-30 | 1 | 26,259 | Orlando Hernandez | Pat Rapp | Joe Borowski | Matt Whisenant | | 742 | 464 | 278 |
| 1998-08-19 | @ MIN | 123 | L 3-5 | 92-31 | 1 | 17,923 | Andy Pettitte | Mike Morgan | Dan Serafini | Andy Pettitte | Rick Aguilera | 745 | 469 | 276 |
| 1998-08-20 | @ MIN | 124 | L 4-9 | 92-32 | 1 | 18,548 | Mike Buddie | Frankie Rodriguez | Frankie Rodriguez | Mike Buddie | | 749 | 478 | 271 |
| 1998-08-21 | @ TEX | 125 | W 5-0 | 93-32 | 1 | 45,841 | David Wells | Esteban Loaiza | David Wells | Esteban Loaiza | | 754 | 478 | 276 |
| 1998-08-22 | @ TEX | 126 | W 12-9 | 94-32 | 1 | 46,483 | David Cone | John Burkett | Ryan Bradley | Xavier Hernandez | Mariano Rivera | 766 | 487 | 279 |
| 1998-08-23 | @ TEX | 127 | L 10-12 | 94-33 | 1 | 37,284 | Orlando Hernandez | Rick Helling | Rick Helling | Orlando Hernandez | John Wetteland | 776 | 499 | 277 |
| 1998-08-24 | vs ANA | 128 | L 3-7 | 94-34 | 1 | 19,297 | Andy Pettitte | Jack McDowell | Jack McDowell | Andy Pettitte | | 779 | 506 | 273 |
| 1998-08-25 | vs ANA | 129 | L 6-7 | 94-35 | 1 | 30,422 | Hideki Irabu | Omar Olivares | Allen Watson | Mike Stanton | Troy Percival | 785 | 513 | 272 |
| 1998-08-26 | vs ANA | 130 | L 4-6 | 95-36 | 1 | 20,077 | Ryan Bradley | Jeff Juden | Jeff Juden | Ryan Bradley | Troy Percival | 789 | 519 | 270 |
| 1998-08-26 | vs ANA | 131 | W 7-6 | 95-36 | 1 | 28,837 | David Wells | Steve Sparks | Mariano Rivera | Mike Fetters | | 796 | 525 | 271 |
| 1998-08-27 | vs ANA | 132 | W 6-5 | 96-36 | 1 | 29,213 | David Cone | Chuck Finley | Jay Tessmer | Mike Fetters | | 802 | 530 | 272 |
| 1998-08-28 | vs SEA | 133 | W 10-3 | 97-36 | 1 | 49,789 | Orlando Hernandez | Paul Spoljaric | Orlando Hernandez | Paul Spoljaric | | 812 | 533 | 279 |
| 1998-08-29 | vs SEA | 134 | W 11-6 | 98-36 | 1 | 55,146 | Andy Pettitte | Ken Cloude | Andy Pettitte | Ken Cloude | | 823 | 539 | 284 |
| 1998-08-30 | vs SEA | 135 | L 3-13 | 98-37 | 1 | 55,341 | Hideki Irabu | Bill Swift | Bill Swift | Hideki Irabu | | 826 | 552 | 274 |
| 1998-09-01 | vs OAK | 136 | W 7-0 | 99-37 | 1 | 29,632 | David Wells | Tom Candiotti | David Wells | Tom Candiotti | | 833 | 552 | 281 |
| 1998-09-02 | vs OAK | 137 | L 0-2 | 99-38 | 1 | 30,332 | David Cone | Gil Heredia | Gil Heredia | David Cone | Billy Taylor | 833 | 554 | 279 |
| 1998-09-04 | @ CHA | 138 | W 11-6 | 100-38 | 1 | 19,876 | Orlando Hernandez | Mike Sirotka | Graeme Lloyd | Chad Bradford | | 844 | 560 | 284 |
| 1998-09-05 | @ CHA | 139 | L 5-9 | 100-39 | 1 | 33,092 | Andy Pettitte | Jim Abbott | Jim Abbott | Andy Pettitte | | 849 | 569 | 280 |
| 1998-09-06 | @ CHA | 140 | L 5-6 | 100-40 | 1 | 24,498 | Hideki Irabu | James Baldwin | James Baldwin | Hideki Irabu | Bob Howry | 854 | 575 | 279 |
| 1998-09-07 | @ BOS | 141 | L 3-4 | 100-41 | 1 | 32,106 | David Wells | Steve Avery | Greg Swindell | David Wells | Tom Gordon | 857 | 579 | 278 |
| 1998-09-08 | @ BOS | 142 | W 3-2 | 101-41 | 1 | 33,409 | David Cone | Pedro Martinez | David Cone | Pedro Martinez | Mariano Rivera | 860 | 581 | 279 |
| 1998-09-09 | @ BOS | 143 | W 7-5 | 102-41 | 1 | 32,942 | Orlando Hernandez | Tim Wakefield | Ramiro Mendoza | Tim Wakefield | Mariano Rivera | 867 | 586 | 281 |
| 1998-09-10 | vs TOR | 144 | W 8-5 | 103-41 | 1 | 25,881 | Andy Pettitte | Pat Hentgen | Andy Pettitte | Pat Hentgen | Darren Holmes | 875 | 591 | 284 |
| 1998-09-11 | vs TOR | 145 | L 4-5 | 103-42 | 1 | 35,856 | Hideki Irabu | Roger Clemens | Carlos Almanzar | Hideki Irabu | Robert Person | 879 | 596 | 283 |
| 1998-09-12 | vs TOR | 146 | L 3-5 | 103-43 | 1 | 48,752 | David Wells | Chris Carpenter | Chris Carpenter | David Wells | Robert Person | 882 | 601 | 281 |
| 1998-09-13 | vs TOR | 147 | L 3-5 | 103-44 | 1 | 47,471 | David Cone | Kelvim Escobar | Kelvim Escobar | David Cone | Robert Person | 885 | 606 | 279 |
| 1998-09-14 | vs BOS | 148 | W 3-0 | 104-44 | 1 | 42,735 | Orlando Hernandez | Pedro Martinez | Orlando Hernandez | Pedro Martinez | | 888 | 606 | 282 |
| 1998-09-15 | vs BOS | 149 | L 4-9 | 104-45 | 1 | 43,218 | Mike Jerzembeck | Tim Wakefield | Tim Wakefield | Mike Jerzembeck | | 892 | 615 | 277 |
| 1998-09-16 | @ TBA | 150 | L 0-7 | 104-46 | 1 | 38,862 | Andy Pettitte | Tony Saunders | Tony Saunders | Andy Pettitte | | 892 | 622 | 270 |
| 1998-09-17 | @ TBA | 151 | W 4-0 | 105-46 | 1 | 38,820 | Hideki Irabu | Julio Santana | Hideki Irabu | Julio Santana | | 896 | 622 | 274 |
| 1998-09-18 | @ BAL | 152 | W 15-5 | 106-46 | 1 | 48,113 | David Wells | Juan Guzman | David Wells | Juan Guzman | | 911 | 627 | 284 |
| 1998-09-19 | @ BAL | 153 | L 3-5 | 106-47 | 1 | 48,044 | David Cone | Sidney Ponson | Sidney Ponson | David Cone | Alan Mills | 914 | 632 | 282 |
| 1998-09-20 | @ BAL | 154 | W 5-4 | 107-47 | 1 | 48,013 | Orlando Hernandez | Doug Johns | Orlando Hernandez | Doug Johns | Mariano Rivera | 919 | 636 | 283 |
| 1998-09-21 | vs CLE | 155 | L 1-4 | 107-48 | 1 | 21,449 | Andy Pettitte | Charles Nagy | Charles Nagy | Andy Pettitte | Paul Shuey | 920 | 640 | 280 |
| 1998-09-22 | vs CLE | 156 | W 10-4 | 109-48 | 1 | 14,840 | Ramiro Mendoza | Dave Burba | Ramiro Mendoza | Dave Burba | | 930 | 644 | 286 |
| 1998-09-22 | vs CLE | 157 | W 5-1 | 109-48 | 1 | 32,315 | Hideki Irabu | Chad Ogea | Hideki Irabu | Chad Ogea | | 935 | 645 | 290 |
| 1998-09-23 | vs CLE | 158 | W 8-4 | 110-48 | 1 | 32,367 | Mike Jerzembeck | Jason Jacome | Ryan Bradley | Jason Jacome | | 943 | 649 | 294 |
| 1998-09-24 | vs TBA | 159 | W 5-2 | 111-48 | 1 | 24,555 | David Wells | Wilson Alvarez | Mike Buddie | Wilson Alvarez | Jeff Nelson | 948 | 651 | 297 |
| 1998-09-25 | vs TBA | 160 | W 6-1 | 112-48 | 1 | 32,447 | Orlando Hernandez | Dave Eiland | Orlando Hernandez | Dave Eiland | | 954 | 652 | 302 |
| 1998-09-26 | vs TBA | 161 | W 3-1 | 113-48 | 1 | 41,150 | David Cone | Terrell Wade | David Cone | Terrell Wade | | 957 | 653 | 304 |
| 1998-09-27 | vs TBA | 162 | W 8-3 | 114-48 | 1 | 49,608 | Jim Bruske | Bryan Rekar | Jim Bruske | Rick White | | 965 | 656 | 309 |