| 1998-03-31 | vs CHN | 1 | W 11-6 | 1-0 | 2 | 41,126 | Livan Hernandez | Kevin Tapani | Livan Hernandez | Kevin Tapani | | 11 | 6 | 5 |
| 1998-04-01 | vs CHN | 2 | L 3-10 | 1-1 | 3 | 16,877 | Felix Heredia | Mark Clark | Mark Clark | Felix Heredia | | 14 | 16 | -2 |
| 1998-04-02 | vs CHN | 3 | L 7-8 | 1-2 | 4 | 17,209 | Rafael Medina | Geremi Gonzalez | Bob Patterson | Jay Powell | Rod Beck | 21 | 24 | -3 |
| 1998-04-03 | vs MIL | 4 | L 1-7 | 1-3 | 4 | 20,921 | Eric Ludwick | Jose Mercedes | Steve Woodard | Eric Ludwick | | 22 | 31 | -9 |
| 1998-04-04 | vs MIL | 5 | L 2-6 | 1-4 | 4 | 23,528 | Brian Meadows | Jeff Juden | Jeff Juden | Brian Meadows | | 24 | 37 | -13 |
| 1998-04-05 | vs MIL | 6 | L 2-5 | 1-5 | 4 | 28,075 | Livan Hernandez | Cal Eldred | Alberto Reyes | Livan Hernandez | Doug Jones | 26 | 42 | -16 |
| 1998-04-06 | vs MIL | 7 | L 5-8 | 1-6 | 4 | 17,940 | Felix Heredia | Paul Wagner | Steve Woodard | Felix Heredia | Doug Jones | 31 | 50 | -19 |
| 1998-04-07 | @ PHI | 8 | L 8-9 | 1-7 | 4 | 41,158 | Rafael Medina | Garrett Stephenson | Ricky Bottalico | Jesus Sanchez | | 39 | 59 | -20 |
| 1998-04-08 | @ PHI | 9 | L 5-9 | 1-8 | 4 | 11,769 | Eric Ludwick | Mike Grace | Mike Grace | Eric Ludwick | | 44 | 68 | -24 |
| 1998-04-10 | @ PIT | 10 | L 1-4 | 1-9 | 5 | 16,561 | Brian Meadows | Jose Silva | Jose Silva | Brian Meadows | Rich Loiselle | 45 | 72 | -27 |
| 1998-04-11 | @ PIT | 11 | L 6-7 | 1-10 | 5 | 19,920 | Livan Hernandez | Francisco Cordova | Rich Loiselle | Jay Powell | | 51 | 79 | -28 |
| 1998-04-12 | @ PIT | 12 | L 3-7 | 1-11 | 5 | 12,203 | Rafael Medina | Jason Schmidt | Jason Schmidt | Rafael Medina | | 54 | 86 | -32 |
| 1998-04-13 | @ PIT | 13 | W 7-2 | 2-11 | 5 | 10,938 | Andy Larkin | Esteban Loaiza | Andy Larkin | Esteban Loaiza | | 61 | 88 | -27 |
| 1998-04-15 | vs PHI | 14 | W 3-2 | 3-11 | 5 | 23,008 | Brian Meadows | Curt Schilling | Brian Meadows | Curt Schilling | Felix Heredia | 64 | 90 | -26 |
| 1998-04-16 | vs PHI | 15 | W 12-4 | 4-11 | 5 | 16,708 | Livan Hernandez | Tyler Green | Livan Hernandez | Tyler Green | | 76 | 94 | -18 |
| 1998-04-17 | @ ARI | 16 | L 5-7 | 4-12 | 5 | 47,401 | Rafael Medina | Willie Blair | Russ Springer | Vic Darensbourg | Felix Rodriguez | 81 | 101 | -20 |
| 1998-04-18 | @ ARI | 17 | L 5-7 | 4-13 | 5 | 46,910 | Andy Larkin | Brian Anderson | Barry Manuel | Antonio Alfonseca | Felix Rodriguez | 86 | 108 | -22 |
| 1998-04-19 | @ ARI | 18 | W 4-3 | 5-13 | 5 | 47,339 | Brian Meadows | Jeff Suppan | Brian Meadows | Jeff Suppan | Rob Stanifer | 90 | 111 | -21 |
| 1998-04-20 | @ ARI | 19 | L 4-15 | 5-14 | 5 | 45,256 | Livan Hernandez | Joel Adamson | Clint Sodowsky | Livan Hernandez | | 94 | 126 | -32 |
| 1998-04-22 | vs COL | 20 | W 3-2 | 6-14 | 5 | 16,405 | Jesus Sanchez | John Thomson | Jay Powell | Curt Leskanic | | 97 | 128 | -31 |
| 1998-04-23 | vs COL | 21 | L 3-4 | 6-15 | 5 | 15,098 | Andy Larkin | Pedro Astacio | Jerry DiPoto | Rob Stanifer | | 100 | 132 | -32 |
| 1998-04-24 | vs COL | 22 | W 5-1 | 7-15 | 5 | 21,708 | Brian Meadows | Mark Thompson | Brian Meadows | Mark Thompson | | 105 | 133 | -28 |
| 1998-04-25 | vs ARI | 23 | L 3-4 | 7-16 | 5 | 28,710 | Livan Hernandez | Jeff Suppan | Scott Brow | Vic Darensbourg | Felix Rodriguez | 108 | 137 | -29 |
| 1998-04-26 | vs ARI | 24 | W 12-6 | 8-16 | 4 | 24,782 | Eric Ludwick | Joel Adamson | Eric Ludwick | Joel Adamson | | 120 | 143 | -23 |
| 1998-04-27 | @ COL | 25 | W 5-4 | 9-16 | 4 | 48,048 | Jesus Sanchez | John Thomson | Jay Powell | Curt Leskanic | Antonio Alfonseca | 125 | 147 | -22 |
| 1998-04-28 | @ COL | 26 | L 7-8 | 9-17 | 4 | 47,346 | Andy Larkin | Pedro Astacio | Pedro Astacio | Andy Larkin | Curt Leskanic | 132 | 155 | -23 |
| 1998-04-30 | vs SDN | 27 | L 1-4 | 9-18 | 4 | 14,562 | Brian Meadows | Pete Smith | Pete Smith | Brian Meadows | Trevor Hoffman | 133 | 159 | -26 |
| 1998-05-01 | vs SDN | 28 | W 6-5 | 10-18 | 4 | 19,465 | Livan Hernandez | Kevin Brown | Jay Powell | Dan Miceli | | 139 | 164 | -25 |
| 1998-05-02 | vs SDN | 29 | L 7-8 | 10-19 | 4 | 22,383 | Eric Ludwick | Joey Hamilton | Joey Hamilton | Eric Ludwick | Trevor Hoffman | 146 | 172 | -26 |
| 1998-05-03 | vs SDN | 30 | W 1-0 | 11-19 | 4 | 18,644 | Jesus Sanchez | Andy Ashby | Jesus Sanchez | Andy Ashby | Jay Powell | 147 | 172 | -25 |
| 1998-05-04 | vs SFN | 31 | L 0-8 | 11-20 | 4 | 12,806 | Andy Larkin | Shawn Estes | Shawn Estes | Andy Larkin | | 147 | 180 | -33 |
| 1998-05-05 | vs SFN | 32 | L 2-8 | 11-21 | 5 | 12,975 | Brian Meadows | Orel Hershiser | Robb Nen | Vic Darensbourg | | 149 | 188 | -39 |
| 1998-05-06 | vs SFN | 33 | L 9-10 | 11-22 | 5 | 16,189 | Livan Hernandez | Kirk Rueter | Steve Reed | Vic Darensbourg | Robb Nen | 158 | 198 | -40 |
| 1998-05-07 | vs LAN | 34 | L 3-4 | 11-23 | 5 | 14,639 | Chris Hammond | Ramon Martinez | Ramon Martinez | Rob Stanifer | Scott Radinsky | 161 | 202 | -41 |
| 1998-05-08 | vs LAN | 35 | W 12-6 | 12-23 | 5 | 27,071 | Jesus Sanchez | Chan Ho Park | Jesus Sanchez | Chan Ho Park | | 173 | 208 | -35 |
| 1998-05-09 | vs LAN | 36 | W 7-4 | 13-23 | 5 | 32,115 | Andy Larkin | Hideo Nomo | Andy Larkin | Hideo Nomo | | 180 | 212 | -32 |
| 1998-05-10 | vs LAN | 37 | L 2-4 | 13-24 | 5 | 19,486 | Brian Meadows | Ismael Valdez | Ismael Valdez | Brian Meadows | Scott Radinsky | 182 | 216 | -34 |
| 1998-05-11 | @ HOU | 38 | L 2-5 | 13-25 | 5 | 14,110 | Livan Hernandez | Shane Reynolds | Shane Reynolds | Livan Hernandez | Billy Wagner | 184 | 221 | -37 |
| 1998-05-12 | @ HOU | 39 | L 2-4 | 13-26 | 5 | 14,919 | Chris Hammond | Sean Bergman | Sean Bergman | Chris Hammond | Billy Wagner | 186 | 225 | -39 |
| 1998-05-13 | @ CIN | 40 | L 4-10 | 13-27 | 5 | 15,121 | Jesus Sanchez | Brett Tomko | Brett Tomko | Donn Pall | | 190 | 235 | -45 |
| 1998-05-14 | @ CIN | 41 | L 8-11 | 13-28 | 5 | 14,561 | Andy Larkin | Scott Winchester | Scott Winchester | Andy Larkin | Jeff Shaw | 198 | 246 | -48 |
| 1998-05-15 | @ SLN | 42 | W 8-7 | 14-28 | 5 | 45,451 | Brian Meadows | Brady Raggio | Brian Meadows | Brady Raggio | Jay Powell | 206 | 253 | -47 |
| 1998-05-16 | @ SLN | 43 | L 4-5 | 14-29 | 5 | 41,464 | Livan Hernandez | Todd Stottlemyre | Todd Stottlemyre | Vic Darensbourg | | 210 | 258 | -48 |
| 1998-05-17 | @ SLN | 44 | L 4-13 | 14-30 | 5 | 41,836 | Chris Hammond | Kent Mercker | Kent Mercker | Chris Hammond | | 214 | 271 | -57 |
| 1998-05-18 | @ SLN | 45 | W 7-3 | 15-30 | 5 | 36,820 | Jesus Sanchez | Manny Aybar | Jesus Sanchez | Manny Aybar | | 221 | 274 | -53 |
| 1998-05-20 | vs ARI | 46 | L 3-7 | 15-31 | 5 | 17,560 | Andy Larkin | Omar Daal | Omar Daal | Andy Larkin | Gregg Olson | 224 | 281 | -57 |
| 1998-05-21 | vs ARI | 47 | L 4-6 | 15-32 | 5 | 15,116 | Brian Meadows | Jeff Suppan | Amaury Telemaco | Vic Darensbourg | Gregg Olson | 228 | 287 | -59 |
| 1998-05-22 | vs PIT | 48 | W 3-1 | 16-32 | 5 | 22,057 | Livan Hernandez | Esteban Loaiza | Livan Hernandez | Esteban Loaiza | | 231 | 288 | -57 |
| 1998-05-23 | vs PIT | 49 | L 4-10 | 16-33 | 5 | 30,499 | Joe Fontenot | Jon Lieber | Jon Lieber | Joe Fontenot | Ricardo Rincon | 235 | 298 | -63 |
| 1998-05-24 | vs PIT | 50 | W 4-3 | 17-33 | 5 | 16,972 | Jesus Sanchez | Jose Silva | Jay Powell | Jason Christiansen | | 239 | 301 | -62 |
| 1998-05-26 | vs NYN | 51 | L 6-10 | 17-34 | 5 | 14,760 | Andy Larkin | Dave Mlicki | Brian Bohanon | Andy Larkin | | 245 | 311 | -66 |
| 1998-05-27 | vs NYN | 52 | L 2-8 | 17-35 | 5 | 15,854 | Brian Meadows | Masato Yoshii | Masato Yoshii | Brian Meadows | | 247 | 319 | -72 |
| 1998-05-29 | @ MIL | 53 | L 3-4 | 17-36 | 5 | 25,032 | Livan Hernandez | Jeff Juden | Bob Wickman | Jay Powell | | 250 | 323 | -73 |
| 1998-05-30 | @ MIL | 54 | L 4-12 | 17-37 | 5 | 21,013 | Joe Fontenot | Cal Eldred | Cal Eldred | Joe Fontenot | | 254 | 335 | -81 |
| 1998-05-31 | @ MIL | 55 | L 6-7 | 17-38 | 5 | 25,590 | Jesus Sanchez | Scott Karl | Brad Woodall | Antonio Alfonseca | Bob Wickman | 260 | 342 | -82 |
| 1998-06-01 | @ CHN | 56 | L 2-10 | 17-39 | 5 | 25,538 | Ryan Dempster | Geremi Gonzalez | Geremi Gonzalez | Ryan Dempster | | 262 | 352 | -90 |
| 1998-06-02 | @ CHN | 57 | L 1-2 | 17-40 | 5 | 16,875 | Brian Meadows | Mark Clark | Terry Adams | Felix Heredia | | 263 | 354 | -91 |
| 1998-06-03 | @ CHN | 58 | L 1-5 | 17-41 | 5 | 20,942 | Livan Hernandez | Kerry Wood | Kerry Wood | Livan Hernandez | | 264 | 359 | -95 |
| 1998-06-05 | @ NYA | 59 | L 1-5 | 17-42 | 5 | 28,085 | Joe Fontenot | Andy Pettitte | Andy Pettitte | Joe Fontenot | | 265 | 364 | -99 |
| 1998-06-06 | @ NYA | 60 | L 2-4 | 17-43 | 5 | 36,419 | Jesus Sanchez | Ramiro Mendoza | Ramiro Mendoza | Jesus Sanchez | Mariano Rivera | 267 | 368 | -101 |
| 1998-06-07 | @ NYA | 61 | L 1-4 | 17-44 | 5 | 47,731 | Ryan Dempster | David Cone | David Cone | Ryan Dempster | | 268 | 372 | -104 |
| 1998-06-08 | vs TOR | 62 | W 4-3 | 18-44 | 5 | 17,414 | Brian Meadows | Roger Clemens | Brian Edmondson | Erik Hanson | | 272 | 375 | -103 |
| 1998-06-09 | vs TOR | 63 | W 5-4 | 19-44 | 5 | 14,591 | Livan Hernandez | Woody Williams | Livan Hernandez | Paul Quantrill | | 277 | 379 | -102 |
| 1998-06-10 | vs TOR | 64 | L 3-4 | 19-45 | 5 | 16,994 | Joe Fontenot | Pat Hentgen | Robert Person | Jay Powell | Randy Myers | 280 | 383 | -103 |
| 1998-06-11 | vs NYN | 65 | L 3-5 | 19-46 | 5 | 14,003 | Jesus Sanchez | Bobby Jones | Bobby Jones | Jesus Sanchez | John Franco | 283 | 388 | -105 |
| 1998-06-12 | vs NYN | 66 | W 4-3 | 20-46 | 5 | 35,652 | Ryan Dempster | Masato Yoshii | Matt Mantei | Brian Bohanon | | 287 | 391 | -104 |
| 1998-06-13 | vs NYN | 67 | L 4-7 | 20-47 | 5 | 31,887 | Brian Meadows | Rick Reed | Rick Reed | Brian Meadows | John Franco | 291 | 398 | -107 |
| 1998-06-14 | vs NYN | 68 | W 5-4 | 21-47 | 5 | 23,924 | Livan Hernandez | Hideo Nomo | Matt Mantei | John Hudek | | 296 | 402 | -106 |
| 1998-06-16 | @ ATL | 69 | L 0-7 | 21-48 | 5 | 39,331 | Joe Fontenot | Denny Neagle | Denny Neagle | Joe Fontenot | | 296 | 409 | -113 |
| 1998-06-17 | @ ATL | 70 | L 2-6 | 21-49 | 5 | 38,021 | Jesus Sanchez | Greg Maddux | Greg Maddux | Jesus Sanchez | | 298 | 415 | -117 |
| 1998-06-18 | @ ATL | 71 | W 3-2 | 22-49 | 5 | 46,296 | Ryan Dempster | Tom Glavine | Kirt Ojala | Tom Glavine | Antonio Alfonseca | 301 | 417 | -116 |
| 1998-06-19 | @ NYN | 72 | W 3-2 | 23-49 | 5 | 32,738 | Brian Meadows | Rick Reed | Brian Meadows | Rick Reed | Matt Mantei | 304 | 419 | -115 |
| 1998-06-20 | @ NYN | 73 | W 8-3 | 24-49 | 5 | 44,355 | Livan Hernandez | Hideo Nomo | Livan Hernandez | Hideo Nomo | | 312 | 422 | -110 |
| 1998-06-21 | @ NYN | 74 | L 2-3 | 24-50 | 5 | 30,673 | Joe Fontenot | Al Leiter | Al Leiter | Joe Fontenot | John Franco | 314 | 425 | -111 |
| 1998-06-22 | @ TBA | 75 | W 3-2 | 25-50 | 5 | 25,623 | Jesus Sanchez | Rolando Arrojo | Antonio Alfonseca | Jim Mecir | | 317 | 427 | -110 |
| 1998-06-23 | @ TBA | 76 | L 4-6 | 25-51 | 5 | 27,523 | Ryan Dempster | Dennis Springer | Albie Lopez | Ryan Dempster | Roberto Hernandez | 321 | 433 | -112 |
| 1998-06-24 | vs TBA | 77 | W 8-4 | 26-51 | 5 | 19,501 | Brian Meadows | Tony Saunders | Brian Meadows | Tony Saunders | | 329 | 437 | -108 |
| 1998-06-25 | vs TBA | 78 | W 5-1 | 27-51 | 5 | 16,826 | Livan Hernandez | Julio Santana | Livan Hernandez | Julio Santana | | 334 | 438 | -104 |
| 1998-06-26 | vs BOS | 79 | L 1-6 | 27-52 | 5 | 23,792 | Joe Fontenot | Pedro Martinez | Pedro Martinez | Joe Fontenot | | 335 | 444 | -109 |
| 1998-06-27 | vs BOS | 80 | L 4-9 | 27-53 | 5 | 31,212 | Jesus Sanchez | Tim Wakefield | Tim Wakefield | Jesus Sanchez | | 339 | 453 | -114 |
| 1998-06-28 | vs BOS | 81 | W 5-1 | 28-53 | 5 | 28,418 | Ryan Dempster | Derek Lowe | Ryan Dempster | Derek Lowe | Antonio Alfonseca | 344 | 454 | -110 |
| 1998-06-30 | @ BAL | 82 | W 7-5 | 29-53 | 5 | 43,505 | Brian Meadows | Scott Erickson | Brian Edmondson | Alan Mills | Matt Mantei | 351 | 459 | -108 |
| 1998-07-01 | @ BAL | 83 | W 5-3 | 30-53 | 5 | 41,997 | Livan Hernandez | Pete Smith | Livan Hernandez | Pete Smith | Jay Powell | 356 | 462 | -106 |
| 1998-07-02 | @ BAL | 84 | L 3-5 | 30-54 | 5 | 46,006 | Joe Fontenot | Sidney Ponson | Sidney Ponson | Joe Fontenot | Armando Benitez | 359 | 467 | -108 |
| 1998-07-03 | @ MON | 85 | L 4-8 | 30-55 | 5 | 10,048 | Jesus Sanchez | Javier Vazquez | Javier Vazquez | Jesus Sanchez | | 363 | 475 | -112 |
| 1998-07-04 | @ MON | 86 | W 3-2 | 31-55 | 5 | 8,362 | Ryan Dempster | Shawn Boskie | Brian Edmondson | Shawn Boskie | Antonio Alfonseca | 366 | 477 | -111 |
| 1998-07-05 | @ MON | 87 | W 2-1 | 32-55 | 5 | 10,483 | Brian Meadows | Carlos Perez | Brian Meadows | Carlos Perez | Antonio Alfonseca | 368 | 478 | -110 |
| 1998-07-09 | vs ATL | 88 | L 4-6 | 32-56 | 5 | 25,535 | Livan Hernandez | John Smoltz | John Smoltz | Livan Hernandez | Kerry Ligtenberg | 372 | 484 | -112 |
| 1998-07-10 | vs ATL | 89 | W 3-1 | 33-56 | 5 | 26,018 | Jesus Sanchez | Denny Neagle | Jesus Sanchez | Denny Neagle | Felix Heredia | 375 | 485 | -110 |
| 1998-07-11 | vs ATL | 90 | W 4-3 | 34-56 | 5 | 36,795 | Ryan Dempster | Greg Maddux | Matt Mantei | Greg Maddux | | 379 | 488 | -109 |
| 1998-07-12 | vs ATL | 91 | W 5-3 | 35-56 | 5 | 24,956 | Brian Meadows | Tom Glavine | Brian Meadows | Tom Glavine | Antonio Alfonseca | 384 | 491 | -107 |
| 1998-07-13 | vs MON | 92 | W 8-7 | 36-56 | 5 | 11,716 | Eric Ludwick | Shawn Boskie | Antonio Alfonseca | Anthony Telford | | 392 | 498 | -106 |
| 1998-07-14 | vs MON | 93 | L 1-2 | 36-57 | 5 | 11,866 | Livan Hernandez | Dustin Hermanson | Dustin Hermanson | Livan Hernandez | Ugueth Urbina | 393 | 500 | -107 |
| 1998-07-15 | vs MON | 94 | L 5-9 | 36-58 | 5 | 15,672 | Jesus Sanchez | Carlos Perez | Carlos Perez | Brian Edmondson | | 398 | 509 | -111 |
| 1998-07-17 | vs CHN | 95 | L 1-6 | 36-59 | 5 | 20,141 | Ryan Dempster | Steve Trachsel | Steve Trachsel | Ryan Dempster | | 399 | 515 | -116 |
| 1998-07-18 | vs CHN | 96 | W 2-1 | 37-59 | 5 | 32,062 | Brian Meadows | Mark Clark | Brian Meadows | Mark Clark | Matt Mantei | 401 | 516 | -115 |
| 1998-07-19 | vs CHN | 97 | L 6-7 | 37-60 | 5 | 20,866 | Eric Ludwick | Geremi Gonzalez | Terry Mulholland | Rob Stanifer | Rod Beck | 407 | 523 | -116 |
| 1998-07-20 | vs MIL | 98 | L 3-5 | 37-61 | 5 | 12,759 | Livan Hernandez | Scott Karl | Scott Karl | Livan Hernandez | Bob Wickman | 410 | 528 | -118 |
| 1998-07-21 | vs MIL | 99 | L 4-6 | 37-62 | 5 | 15,325 | Jesus Sanchez | Cal Eldred | Alberto Reyes | Antonio Alfonseca | | 414 | 534 | -120 |
| 1998-07-22 | @ PIT | 100 | L 4-6 | 37-63 | 5 | 13,544 | Ryan Dempster | Todd Van Poppel | Todd Van Poppel | Ryan Dempster | Jason Christiansen | 418 | 540 | -122 |
| 1998-07-23 | @ PIT | 101 | L 1-9 | 37-64 | 5 | 11,374 | Brian Meadows | Jon Lieber | Jon Lieber | Brian Meadows | | 419 | 549 | -130 |
| 1998-07-24 | @ PHI | 102 | L 4-6 | 37-66 | 5 | 0 | Kirt Ojala | Matt Beech | Wayne Gomes | Antonio Alfonseca | | 423 | 555 | -132 |
| 1998-07-24 | @ PHI | 103 | L 6-7 | 37-66 | 5 | 30,622 | Andy Larkin | Carlton Loewer | Mark Leiter | Vic Darensbourg | | 429 | 562 | -133 |
| 1998-07-25 | @ PHI | 104 | W 5-4 | 38-66 | 5 | 21,038 | Livan Hernandez | Curt Schilling | Livan Hernandez | Curt Schilling | Matt Mantei | 434 | 566 | -132 |
| 1998-07-26 | @ PHI | 105 | L 9-10 | 38-67 | 5 | 27,944 | Jesus Sanchez | Mark Portugal | Mark Leiter | Antonio Alfonseca | | 443 | 576 | -133 |
| 1998-07-27 | @ HOU | 106 | L 1-9 | 38-68 | 5 | 20,888 | Brian Meadows | Jose Lima | Jose Lima | Brian Meadows | | 444 | 585 | -141 |
| 1998-07-28 | @ HOU | 107 | L 3-7 | 38-69 | 5 | 26,220 | Kirt Ojala | Sean Bergman | Sean Bergman | Kirt Ojala | | 447 | 592 | -145 |
| 1998-07-29 | @ HOU | 108 | L 6-10 | 38-70 | 5 | 21,870 | Andy Larkin | Pete Schourek | Pete Schourek | Andy Larkin | Scott Elarton | 453 | 602 | -149 |
| 1998-07-30 | @ HOU | 109 | W 4-3 | 39-70 | 5 | 33,303 | Livan Hernandez | Shane Reynolds | Livan Hernandez | Shane Reynolds | | 457 | 605 | -148 |
| 1998-07-31 | vs CIN | 110 | L 2-3 | 39-71 | 5 | 16,763 | Jesus Sanchez | Brett Tomko | Brett Tomko | Matt Mantei | Gabe White | 459 | 608 | -149 |
| 1998-08-01 | vs CIN | 111 | L 7-9 | 39-72 | 5 | 24,027 | Ryan Dempster | Mike Remlinger | John Hudek | Matt Mantei | | 466 | 617 | -151 |
| 1998-08-02 | vs CIN | 112 | L 1-5 | 39-73 | 5 | 22,136 | Kirt Ojala | Dennys Reyes | Dennys Reyes | Kirt Ojala | Danny Graves | 467 | 622 | -155 |
| 1998-08-03 | vs HOU | 113 | W 11-3 | 40-73 | 5 | 14,484 | Andy Larkin | Sean Bergman | Andy Larkin | Sean Bergman | Matt Mantei | 478 | 625 | -147 |
| 1998-08-04 | vs HOU | 114 | L 5-9 | 40-74 | 5 | 14,586 | Livan Hernandez | Shane Reynolds | Shane Reynolds | Livan Hernandez | | 483 | 634 | -151 |
| 1998-08-05 | vs HOU | 115 | W 5-3 | 41-74 | 5 | 19,038 | Jesus Sanchez | Mike Hampton | Jesus Sanchez | Mike Hampton | Matt Mantei | 488 | 637 | -149 |
| 1998-08-07 | @ SDN | 116 | L 3-6 | 41-75 | 5 | 39,145 | Kirt Ojala | Andy Ashby | Scott Sanders | Justin Speier | | 491 | 643 | -152 |
| 1998-08-09 | @ SDN | 117 | L 5-6 | 41-76 | 5 | 21,065 | Andy Larkin | Sterling Hitchcock | Sterling Hitchcock | Andy Larkin | Trevor Hoffman | 496 | 649 | -153 |
| 1998-08-10 | @ SDN | 118 | W 3-2 | 42-76 | 5 | 41,514 | Livan Hernandez | Kevin Brown | Livan Hernandez | Kevin Brown | | 499 | 651 | -152 |
| 1998-08-11 | @ LAN | 119 | W 8-6 | 43-76 | 5 | 35,270 | Jesus Sanchez | Darren Dreifort | Jesus Sanchez | Darren Dreifort | | 507 | 657 | -150 |
| 1998-08-12 | @ LAN | 120 | W 3-2 | 44-76 | 5 | 36,452 | Kirt Ojala | Carlos Perez | Rob Stanifer | Antonio Osuna | Matt Mantei | 510 | 659 | -149 |
| 1998-08-13 | @ LAN | 121 | L 2-5 | 44-77 | 5 | 34,804 | Brian Meadows | Brian Bohanon | Brian Bohanon | Brian Meadows | Jeff Shaw | 512 | 664 | -152 |
| 1998-08-14 | @ SFN | 122 | L 0-10 | 44-78 | 5 | 18,077 | Andy Larkin | Mark Gardner | Mark Gardner | Andy Larkin | | 512 | 674 | -162 |
| 1998-08-15 | @ SFN | 123 | L 3-4 | 44-79 | 5 | 23,523 | Livan Hernandez | Russ Ortiz | Jose Mesa | Matt Mantei | | 515 | 678 | -163 |
| 1998-08-16 | @ SFN | 124 | L 2-3 | 44-80 | 5 | 28,289 | Jesus Sanchez | Orel Hershiser | Orel Hershiser | Jesus Sanchez | Robb Nen | 517 | 681 | -164 |
| 1998-08-18 | vs SDN | 125 | L 5-7 | 44-81 | 5 | 23,275 | Kirt Ojala | Andy Ashby | Dan Miceli | Antonio Alfonseca | Trevor Hoffman | 522 | 688 | -166 |
| 1998-08-19 | vs SDN | 126 | W 6-0 | 45-81 | 5 | 15,409 | Brian Meadows | Sterling Hitchcock | Brian Meadows | Sterling Hitchcock | | 528 | 688 | -160 |
| 1998-08-20 | vs LAN | 127 | L 1-2 | 45-82 | 5 | 27,664 | Rafael Medina | Dave Mlicki | Scott Radinsky | Justin Speier | Jeff Shaw | 529 | 690 | -161 |
| 1998-08-21 | vs LAN | 128 | L 1-5 | 45-83 | 5 | 19,853 | Livan Hernandez | Chan Ho Park | Chan Ho Park | Livan Hernandez | | 530 | 695 | -165 |
| 1998-08-22 | vs SFN | 129 | L 4-5 | 45-84 | 5 | 27,121 | Jesus Sanchez | Danny Darwin | Rich Rodriguez | Brian Edmondson | Robb Nen | 534 | 700 | -166 |
| 1998-08-23 | vs SFN | 130 | L 5-10 | 45-85 | 5 | 36,701 | Kirt Ojala | Kirk Rueter | Kirk Rueter | Kirt Ojala | | 539 | 710 | -171 |
| 1998-08-24 | vs SFN | 131 | L 4-7 | 45-86 | 5 | 13,254 | Brian Meadows | Mark Gardner | Rich Rodriguez | Brian Edmondson | Robb Nen | 543 | 717 | -174 |
| 1998-08-25 | @ SLN | 132 | W 4-3 | 46-86 | 5 | 29,130 | Rafael Medina | Donovan Osborne | Rafael Medina | Donovan Osborne | Antonio Alfonseca | 547 | 720 | -173 |
| 1998-08-26 | @ SLN | 133 | W 7-6 | 47-86 | 5 | 30,004 | Kirt Ojala | Darren Oliver | Antonio Alfonseca | Juan Acevedo | | 554 | 726 | -172 |
| 1998-08-27 | @ CIN | 134 | L 3-12 | 47-87 | 5 | 14,383 | Livan Hernandez | Steve Parris | Steve Parris | Livan Hernandez | | 557 | 738 | -181 |
| 1998-08-28 | @ CIN | 135 | L 8-10 | 47-88 | 5 | 18,293 | Jesus Sanchez | Jason Bere | Scott Sullivan | Rob Stanifer | Gabe White | 565 | 748 | -183 |
| 1998-08-29 | @ CIN | 136 | L 5-7 | 47-89 | 5 | 22,445 | Brian Meadows | Pete Harnisch | Mike Remlinger | Brian Meadows | Danny Graves | 570 | 755 | -185 |
| 1998-08-30 | @ CIN | 137 | L 7-14 | 47-90 | 5 | 18,426 | Rafael Medina | Dennys Reyes | Dennys Reyes | Rafael Medina | | 577 | 769 | -192 |
| 1998-08-31 | vs SLN | 138 | L 3-5 | 47-91 | 5 | 36,584 | Kirt Ojala | Darren Oliver | Darren Oliver | Kirt Ojala | Juan Acevedo | 580 | 774 | -194 |
| 1998-09-01 | vs SLN | 139 | L 1-7 | 47-92 | 5 | 37,014 | Livan Hernandez | Matt Morris | Matt Morris | Livan Hernandez | | 581 | 781 | -200 |
| 1998-09-02 | vs SLN | 140 | L 4-14 | 47-93 | 5 | 45,170 | Jesus Sanchez | Kent Mercker | Kent Mercker | Jesus Sanchez | | 585 | 795 | -210 |
| 1998-09-04 | vs MON | 141 | L 0-8 | 47-94 | 5 | 16,929 | Brian Meadows | Dustin Hermanson | Dustin Hermanson | Brian Meadows | | 585 | 803 | -218 |
| 1998-09-05 | vs MON | 142 | L 1-7 | 47-95 | 5 | 21,155 | Rafael Medina | Mike Thurman | Mike Thurman | Rafael Medina | | 586 | 810 | -224 |
| 1998-09-06 | vs MON | 143 | W 6-2 | 48-95 | 5 | 16,961 | Kirt Ojala | Carl Pavano | Kirt Ojala | Carl Pavano | Vic Darensbourg | 592 | 812 | -220 |
| 1998-09-07 | @ COL | 144 | L 10-15 | 48-96 | 5 | 41,094 | Livan Hernandez | Pedro Astacio | Curt Leskanic | Eric Ludwick | | 602 | 827 | -225 |
| 1998-09-08 | @ COL | 145 | L 10-11 | 48-97 | 5 | 40,047 | Jesus Sanchez | John Thomson | Chuck McElroy | Matt Mantei | | 612 | 838 | -226 |
| 1998-09-09 | @ COL | 146 | L 8-9 | 48-98 | 5 | 40,500 | Brian Meadows | Bobby Jones | Chuck McElroy | Justin Speier | | 620 | 847 | -227 |
| 1998-09-10 | @ COL | 147 | L 1-3 | 48-99 | 5 | 44,906 | Rafael Medina | Darryl Kile | Darryl Kile | Rafael Medina | | 621 | 850 | -229 |
| 1998-09-11 | @ ATL | 148 | L 2-8 | 48-100 | 5 | 47,235 | Kirt Ojala | John Smoltz | John Smoltz | Kirt Ojala | | 623 | 858 | -235 |
| 1998-09-12 | @ ATL | 149 | L 2-4 | 48-101 | 5 | 48,797 | Livan Hernandez | Bruce Chen | Bruce Chen | Livan Hernandez | Kerry Ligtenberg | 625 | 862 | -237 |
| 1998-09-13 | @ ATL | 150 | W 6-5 | 49-101 | 5 | 45,683 | Jesus Sanchez | Greg Maddux | Jesus Sanchez | Odalis Perez | Matt Mantei | 631 | 867 | -236 |
| 1998-09-14 | @ MON | 151 | L 2-4 | 49-102 | 5 | 11,969 | Brian Meadows | Dustin Hermanson | Dustin Hermanson | Brian Meadows | Ugueth Urbina | 633 | 871 | -238 |
| 1998-09-15 | @ MON | 152 | W 7-4 | 50-102 | 5 | 6,795 | Rafael Medina | Mike Thurman | Rafael Medina | Mike Thurman | | 640 | 875 | -235 |
| 1998-09-16 | @ MON | 153 | L 2-3 | 50-103 | 5 | 13,540 | Kirt Ojala | Carl Pavano | Steve Kline | Kirt Ojala | | 642 | 878 | -236 |
| 1998-09-18 | @ NYN | 154 | W 7-6 | 51-103 | 5 | 34,862 | Livan Hernandez | Rick Reed | Brian Edmondson | John Franco | Matt Mantei | 649 | 884 | -235 |
| 1998-09-19 | @ NYN | 155 | L 3-4 | 51-104 | 5 | 52,062 | Jesus Sanchez | Masato Yoshii | Masato Yoshii | Jesus Sanchez | John Franco | 652 | 888 | -236 |
| 1998-09-20 | @ NYN | 156 | L 0-5 | 51-105 | 5 | 52,767 | Brian Meadows | Al Leiter | Al Leiter | Brian Meadows | | 652 | 893 | -241 |
| 1998-09-22 | vs ATL | 157 | L 1-4 | 51-106 | 5 | 23,355 | Rafael Medina | Kevin Millwood | Kevin Millwood | Rafael Medina | Kerry Ligtenberg | 653 | 897 | -244 |
| 1998-09-23 | vs ATL | 158 | L 0-11 | 51-107 | 5 | 22,469 | Kirt Ojala | John Smoltz | John Smoltz | Kirt Ojala | | 653 | 908 | -255 |
| 1998-09-26 | vs PHI | 159 | W 4-3 | 53-107 | 5 | 0 | Livan Hernandez | Curt Schilling | Antonio Alfonseca | Yorkis Perez | | 657 | 911 | -254 |
| 1998-09-26 | vs PHI | 160 | W 1-0 | 53-107 | 5 | 36,267 | Jesus Sanchez | Paul Byrd | Rob Stanifer | Ricky Bottalico | | 658 | 911 | -253 |
| 1998-09-27 | vs PHI | 161 | W 6-5 | 54-108 | 5 | 0 | Brian Meadows | Tyler Green | Brian Meadows | Tyler Green | Antonio Alfonseca | 664 | 916 | -252 |
| 1998-09-27 | vs PHI | 162 | L 3-7 | 54-108 | 5 | 37,007 | Rafael Medina | Carlton Loewer | Carlton Loewer | Rafael Medina | | 667 | 923 | -256 |