| 1998-03-31 | @ ATL | 1 | L 1-2 | 0-1 | 5 | 42,891 | Cal Eldred | Greg Maddux | Kerry Ligtenberg | Bob Wickman | | 1 | 2 | -1 |
| 1998-04-02 | @ ATL | 2 | W 8-6 | 1-1 | 4 | 29,671 | Scott Karl | Tom Glavine | Mike Myers | Adam Butler | | 9 | 8 | 1 |
| 1998-04-03 | @ FLO | 3 | W 7-1 | 2-1 | 2 | 20,921 | Jose Mercedes | Eric Ludwick | Steve Woodard | Eric Ludwick | | 16 | 9 | 7 |
| 1998-04-04 | @ FLO | 4 | W 6-2 | 3-1 | 2 | 23,528 | Jeff Juden | Brian Meadows | Jeff Juden | Brian Meadows | | 22 | 11 | 11 |
| 1998-04-05 | @ FLO | 5 | W 5-2 | 4-1 | 2 | 28,075 | Cal Eldred | Livan Hernandez | Alberto Reyes | Livan Hernandez | Doug Jones | 27 | 13 | 14 |
| 1998-04-06 | @ FLO | 6 | W 8-5 | 5-1 | 2 | 17,940 | Paul Wagner | Felix Heredia | Steve Woodard | Felix Heredia | Doug Jones | 35 | 18 | 17 |
| 1998-04-07 | vs MON | 7 | W 6-4 | 6-1 | 1 | 51,408 | Scott Karl | Dustin Hermanson | Scott Karl | Dustin Hermanson | Doug Jones | 41 | 22 | 19 |
| 1998-04-09 | vs MON | 8 | L 5-6 | 6-2 | 2 | 6,537 | Steve Woodard | Javier Vazquez | Anthony Telford | Bob Wickman | Ugueth Urbina | 46 | 28 | 18 |
| 1998-04-10 | vs NYN | 9 | W 5-3 | 7-2 | 2 | 10,330 | Jeff Juden | Dave Mlicki | Jeff Juden | Dave Mlicki | Doug Jones | 51 | 31 | 20 |
| 1998-04-11 | vs NYN | 10 | L 1-2 | 7-3 | 2 | 24,140 | Cal Eldred | Masato Yoshii | Dennis Cook | Bob Wickman | John Franco | 52 | 33 | 19 |
| 1998-04-12 | vs NYN | 11 | L 4-6 | 7-4 | 2 | 10,459 | Paul Wagner | Brian Bohanon | Turk Wendell | Paul Wagner | Mel Rojas | 56 | 39 | 17 |
| 1998-04-14 | @ MON | 12 | W 7-4 | 8-4 | 1 | 7,386 | Scott Karl | Javier Vazquez | Scott Karl | Javier Vazquez | | 63 | 43 | 20 |
| 1998-04-15 | @ MON | 13 | L 3-4 | 8-5 | 1 | 7,390 | Jeff Juden | Trey Moore | Trey Moore | Jeff Juden | Ugueth Urbina | 66 | 47 | 19 |
| 1998-04-16 | @ MON | 14 | W 5-3 | 9-5 | 1 | 7,651 | Cal Eldred | Carlos Perez | Doug Jones | Shayne Bennett | | 71 | 50 | 21 |
| 1998-04-17 | vs SFN | 15 | W 5-2 | 10-5 | 1 | 14,524 | Jose Mercedes | Shawn Estes | Jose Mercedes | Shawn Estes | Doug Jones | 76 | 52 | 24 |
| 1998-04-18 | vs SFN | 16 | W 3-1 | 11-5 | 1 | 25,053 | Paul Wagner | Orel Hershiser | Paul Wagner | Orel Hershiser | Doug Jones | 79 | 53 | 26 |
| 1998-04-19 | vs SFN | 17 | W 3-2 | 12-5 | 1 | 30,084 | Scott Karl | Kirk Rueter | Bob Wickman | John Johnstone | | 82 | 55 | 27 |
| 1998-04-21 | vs LAN | 18 | W 5-2 | 13-5 | 1 | 10,008 | Jeff Juden | Ramon Martinez | Jeff Juden | Ramon Martinez | | 87 | 57 | 30 |
| 1998-04-22 | vs LAN | 19 | L 6-9 | 13-6 | 1 | 14,083 | Cal Eldred | Chan Ho Park | Antonio Osuna | Bob Wickman | Scott Radinsky | 93 | 66 | 27 |
| 1998-04-23 | vs LAN | 20 | W 2-1 | 14-6 | 1 | 12,389 | Jose Mercedes | Hideo Nomo | Jose Mercedes | Hideo Nomo | Doug Jones | 95 | 67 | 28 |
| 1998-04-24 | @ SFN | 21 | W 7-5 | 15-6 | 1 | 14,832 | Scott Karl | Orel Hershiser | Scott Karl | Orel Hershiser | Doug Jones | 102 | 72 | 30 |
| 1998-04-25 | @ SFN | 22 | L 1-2 | 15-7 | 1 | 18,457 | Paul Wagner | Kirk Rueter | Kirk Rueter | Paul Wagner | Robb Nen | 103 | 74 | 29 |
| 1998-04-26 | @ SFN | 23 | L 7-8 | 15-8 | 1 | 31,352 | Jeff Juden | Mark Gardner | Steve Reed | Doug Jones | | 110 | 82 | 28 |
| 1998-04-27 | @ LAN | 24 | W 3-2 | 16-8 | 1 | 32,910 | Cal Eldred | Chan Ho Park | Alberto Reyes | Frank Lankford | | 113 | 84 | 29 |
| 1998-04-28 | @ LAN | 25 | L 3-6 | 16-9 | 1 | 29,791 | Jose Mercedes | Hideo Nomo | Hideo Nomo | Jose Mercedes | | 116 | 90 | 26 |
| 1998-05-01 | vs CIN | 26 | W 5-2 | 17-9 | 1 | 11,030 | Scott Karl | Mike Remlinger | Scott Karl | Mike Remlinger | Doug Jones | 121 | 92 | 29 |
| 1998-05-02 | vs CIN | 27 | L 5-8 | 17-10 | 2 | 17,708 | Jeff Juden | David Weathers | Gabe White | Chad Fox | Jeff Shaw | 126 | 100 | 26 |
| 1998-05-03 | vs CIN | 28 | L 3-5 | 17-11 | 2 | 12,358 | Cal Eldred | Brett Tomko | Brett Tomko | Cal Eldred | Jeff Shaw | 129 | 105 | 24 |
| 1998-05-04 | vs SDN | 29 | L 5-13 | 17-12 | 2 | 9,357 | Jose Mercedes | Sterling Hitchcock | Sterling Hitchcock | Jose Mercedes | Don Wengert | 134 | 118 | 16 |
| 1998-05-05 | vs SDN | 30 | L 4-13 | 17-13 | 2 | 9,162 | Paul Wagner | Pete Smith | Pete Smith | Paul Wagner | | 138 | 131 | 7 |
| 1998-05-06 | vs SDN | 31 | W 3-2 | 18-13 | 2 | 13,381 | Scott Karl | Kevin Brown | Doug Jones | Carlos Reyes | | 141 | 133 | 8 |
| 1998-05-08 | vs HOU | 32 | W 4-1 | 19-13 | 2 | 14,711 | Jeff Juden | Mike Hampton | Jeff Juden | Mike Hampton | Doug Jones | 145 | 134 | 11 |
| 1998-05-09 | vs HOU | 33 | L 6-11 | 19-14 | 2 | 20,145 | Cal Eldred | Pete Schourek | Pete Schourek | Cal Eldred | | 151 | 145 | 6 |
| 1998-05-10 | vs HOU | 34 | L 1-7 | 19-15 | 2 | 19,023 | Steve Woodard | Jose Lima | Jose Lima | Steve Woodard | | 152 | 152 | 0 |
| 1998-05-11 | @ SLN | 35 | L 0-7 | 19-16 | 2 | 34,744 | Scott Karl | Todd Stottlemyre | Todd Stottlemyre | Scott Karl | | 152 | 159 | -7 |
| 1998-05-12 | @ SLN | 36 | L 5-6 | 19-17 | 3 | 25,680 | Paul Wagner | Kent Mercker | Mike Busby | Doug Jones | | 157 | 165 | -8 |
| 1998-05-13 | @ ARI | 37 | W 8-3 | 20-17 | 3 | 40,230 | Jeff Juden | Willie Blair | Jeff Juden | Willie Blair | Bob Wickman | 165 | 168 | -3 |
| 1998-05-14 | @ ARI | 38 | L 1-4 | 20-18 | 3 | 40,204 | Cal Eldred | Omar Daal | Russ Springer | Cal Eldred | Gregg Olson | 166 | 172 | -6 |
| 1998-05-15 | @ COL | 39 | W 8-5 | 21-18 | 3 | 48,035 | Steve Woodard | Darryl Kile | Steve Woodard | Darryl Kile | Mike Myers | 174 | 177 | -3 |
| 1998-05-16 | @ COL | 40 | W 7-5 | 22-18 | 3 | 48,063 | Scott Karl | Kevin Ritz | Scott Karl | Kevin Ritz | Doug Jones | 181 | 182 | -1 |
| 1998-05-17 | @ COL | 41 | L 1-2 | 22-19 | 3 | 48,041 | Paul Wagner | Jamey Wright | Jamey Wright | Brad Woodall | Jerry DiPoto | 182 | 184 | -2 |
| 1998-05-18 | @ COL | 42 | L 5-8 | 22-20 | 3 | 48,026 | Jeff Juden | Pedro Astacio | Pedro Astacio | Jeff Juden | Jerry DiPoto | 187 | 192 | -5 |
| 1998-05-19 | vs SFN | 43 | W 9-6 | 23-20 | 3 | 13,138 | Cal Eldred | Shawn Estes | Doug Jones | Jim Poole | | 196 | 198 | -2 |
| 1998-05-20 | vs SFN | 44 | L 2-4 | 23-21 | 3 | 15,286 | Steve Woodard | Orel Hershiser | Orel Hershiser | Steve Woodard | Robb Nen | 198 | 202 | -4 |
| 1998-05-21 | vs SFN | 45 | L 1-8 | 23-22 | 3 | 21,641 | Scott Karl | Kirk Rueter | Kirk Rueter | Scott Karl | | 199 | 210 | -11 |
| 1998-05-22 | @ NYN | 46 | L 2-3 | 23-23 | 4 | 22,307 | Brad Woodall | Rick Reed | Rick Reed | Brad Woodall | John Franco | 201 | 213 | -12 |
| 1998-05-23 | @ NYN | 47 | L 0-3 | 23-24 | 4 | 32,908 | Jeff Juden | Al Leiter | Al Leiter | Jeff Juden | | 201 | 216 | -15 |
| 1998-05-24 | @ NYN | 48 | L 3-8 | 23-25 | 4 | 47,291 | Cal Eldred | Bobby Jones | Bobby Jones | Cal Eldred | | 204 | 224 | -20 |
| 1998-05-26 | vs PIT | 49 | W 3-2 | 24-25 | 4 | 12,272 | Scott Karl | Francisco Cordova | Mike Myers | Rich Loiselle | | 207 | 226 | -19 |
| 1998-05-27 | vs PIT | 50 | W 3-2 | 25-25 | 4 | 10,274 | Steve Woodard | Jason Schmidt | Brad Woodall | Ricardo Rincon | | 210 | 228 | -18 |
| 1998-05-29 | vs FLO | 51 | W 4-3 | 26-25 | 4 | 25,032 | Jeff Juden | Livan Hernandez | Bob Wickman | Jay Powell | | 214 | 231 | -17 |
| 1998-05-30 | vs FLO | 52 | W 12-4 | 27-25 | 4 | 21,013 | Cal Eldred | Joe Fontenot | Cal Eldred | Joe Fontenot | | 226 | 235 | -9 |
| 1998-05-31 | vs FLO | 53 | W 7-6 | 28-25 | 3 | 25,590 | Scott Karl | Jesus Sanchez | Brad Woodall | Antonio Alfonseca | Bob Wickman | 233 | 241 | -8 |
| 1998-06-01 | vs ATL | 54 | L 2-5 | 28-26 | 3 | 21,873 | Steve Woodard | Greg Maddux | Greg Maddux | Steve Woodard | | 235 | 246 | -11 |
| 1998-06-02 | vs ATL | 55 | L 0-9 | 28-27 | 4 | 39,017 | Paul Wagner | Dennis Martinez | Dennis Martinez | Paul Wagner | | 235 | 255 | -20 |
| 1998-06-03 | vs ATL | 56 | L 2-5 | 28-28 | 4 | 19,116 | Jeff Juden | Tom Glavine | Tom Glavine | Jeff Juden | Mark Wohlers | 237 | 260 | -23 |
| 1998-06-05 | vs DET | 57 | W 7-3 | 29-28 | 3 | 14,559 | Cal Eldred | Frank Castillo | Cal Eldred | Frank Castillo | Bob Wickman | 244 | 263 | -19 |
| 1998-06-06 | vs DET | 58 | L 3-9 | 29-29 | 4 | 17,019 | Scott Karl | Bryce Florie | Bryce Florie | Scott Karl | | 247 | 272 | -25 |
| 1998-06-07 | vs DET | 59 | L 1-4 | 29-30 | 4 | 18,737 | Steve Woodard | Justin Thompson | Justin Thompson | Steve Woodard | | 248 | 276 | -28 |
| 1998-06-08 | @ KCA | 60 | L 7-8 | 29-31 | 4 | 13,565 | Jeff Juden | Pat Rapp | Pat Rapp | Jeff Juden | Jeff Montgomery | 255 | 284 | -29 |
| 1998-06-09 | @ KCA | 61 | W 6-3 | 30-31 | 4 | 12,775 | Brad Woodall | Glendon Rusch | Bob Wickman | Jeff Montgomery | Doug Jones | 261 | 287 | -26 |
| 1998-06-10 | @ KCA | 62 | W 9-6 | 31-31 | 4 | 12,477 | Cal Eldred | Tim Belcher | Bronswell Patrick | Hipolito Pichardo | | 270 | 293 | -23 |
| 1998-06-12 | @ PIT | 63 | W 4-2 | 32-31 | 3 | 16,851 | Scott Karl | Francisco Cordova | Scott Karl | Francisco Cordova | Bob Wickman | 274 | 295 | -21 |
| 1998-06-13 | @ PIT | 64 | W 8-1 | 33-31 | 3 | 28,945 | Jeff Juden | Jason Schmidt | Jeff Juden | Jason Schmidt | | 282 | 296 | -14 |
| 1998-06-14 | @ PIT | 65 | L 2-7 | 33-32 | 3 | 23,755 | Steve Woodard | Chris Peters | Chris Peters | Steve Woodard | | 284 | 303 | -19 |
| 1998-06-15 | @ CHN | 66 | L 5-6 | 33-33 | 3 | 37,903 | Cal Eldred | Kerry Wood | Terry Adams | Doug Jones | Rod Beck | 289 | 309 | -20 |
| 1998-06-16 | @ CHN | 67 | W 11-2 | 34-33 | 3 | 25,409 | Brad Woodall | Steve Trachsel | Brad Woodall | Steve Trachsel | | 300 | 311 | -11 |
| 1998-06-17 | @ CHN | 68 | W 6-5 | 35-33 | 3 | 28,673 | Scott Karl | Kevin Tapani | Bronswell Patrick | Kevin Tapani | Bob Wickman | 306 | 316 | -10 |
| 1998-06-18 | vs PIT | 69 | L 0-1 | 35-34 | 3 | 14,774 | Jeff Juden | Jason Schmidt | Elmer Dessens | Doug Jones | Ricardo Rincon | 306 | 317 | -11 |
| 1998-06-19 | vs PIT | 70 | W 2-1 | 36-34 | 3 | 20,935 | Steve Woodard | Chris Peters | Steve Woodard | Chris Peters | Bob Wickman | 308 | 318 | -10 |
| 1998-06-20 | vs PIT | 71 | L 2-4 | 36-35 | 3 | 28,556 | Cal Eldred | Jon Lieber | Jon Lieber | Cal Eldred | Ricardo Rincon | 310 | 322 | -12 |
| 1998-06-21 | vs PIT | 72 | L 7-8 | 36-36 | 4 | 22,338 | Jeff Juden | Esteban Loaiza | Esteban Loaiza | Jeff Juden | Ricardo Rincon | 317 | 330 | -13 |
| 1998-06-22 | vs COL | 73 | W 3-2 | 37-36 | 4 | 22,556 | Brad Woodall | Darryl Kile | Alberto Reyes | Chuck McElroy | Bob Wickman | 320 | 332 | -12 |
| 1998-06-23 | vs COL | 74 | W 7-5 | 38-36 | 3 | 20,759 | Bronswell Patrick | Jamey Wright | Bronswell Patrick | Jamey Wright | Bob Wickman | 327 | 337 | -10 |
| 1998-06-24 | @ MIN | 75 | W 3-1 | 39-36 | 3 | 12,860 | Steve Woodard | LaTroy Hawkins | Steve Woodard | LaTroy Hawkins | Bob Wickman | 330 | 338 | -8 |
| 1998-06-25 | @ MIN | 76 | W 9-2 | 40-36 | 3 | 16,286 | Cal Eldred | Brad Radke | Cal Eldred | Brad Radke | | 339 | 340 | -1 |
| 1998-06-26 | @ CHA | 77 | W 2-1 | 41-36 | 2 | 17,298 | Jeff Juden | James Baldwin | Jeff Juden | Bill Simas | Bob Wickman | 341 | 341 | 0 |
| 1998-06-27 | @ CHA | 78 | W 10-5 | 42-36 | 2 | 22,100 | Brad Woodall | Tom Fordham | Brad Woodall | Tom Fordham | | 351 | 346 | 5 |
| 1998-06-28 | @ CHA | 79 | L 8-10 | 42-37 | 2 | 17,455 | Scott Karl | Mike Sirotka | Bill Simas | Mike Myers | | 359 | 356 | 3 |
| 1998-06-30 | vs CLE | 80 | W 5-4 | 43-37 | 2 | 16,012 | Cal Eldred | Jaret Wright | Cal Eldred | Jaret Wright | Bob Wickman | 364 | 360 | 4 |
| 1998-07-01 | vs CLE | 81 | L 2-5 | 43-38 | 2 | 19,558 | Jeff Juden | Dave Burba | Dave Burba | Jeff Juden | Michael Jackson | 366 | 365 | 1 |
| 1998-07-02 | vs CLE | 82 | L 2-7 | 43-39 | 3 | 21,022 | Brad Woodall | Bartolo Colon | Bartolo Colon | Brad Woodall | | 368 | 372 | -4 |
| 1998-07-03 | @ PHI | 83 | L 0-2 | 43-40 | 3 | 55,393 | Scott Karl | Curt Schilling | Curt Schilling | Scott Karl | Mark Leiter | 368 | 374 | -6 |
| 1998-07-04 | @ PHI | 84 | L 5-6 | 43-41 | 3 | 35,596 | Steve Woodard | Mark Portugal | Wayne Gomes | Bob Wickman | | 373 | 380 | -7 |
| 1998-07-05 | @ PHI | 85 | L 3-4 | 43-42 | 3 | 20,116 | Cal Eldred | Carlton Loewer | Carlton Loewer | Cal Eldred | Mark Leiter | 376 | 384 | -8 |
| 1998-07-09 | vs CHN | 86 | W 12-9 | 44-42 | 3 | 38,055 | Jeff Juden | Kevin Tapani | Alberto Reyes | Bob Patterson | Bob Wickman | 388 | 393 | -5 |
| 1998-07-10 | vs CHN | 87 | W 6-5 | 45-42 | 3 | 43,575 | Scott Karl | Kerry Wood | Bronswell Patrick | Kerry Wood | | 394 | 398 | -4 |
| 1998-07-11 | vs CHN | 88 | L 8-11 | 45-43 | 3 | 52,067 | Cal Eldred | Steve Trachsel | Steve Trachsel | Cal Eldred | Rod Beck | 402 | 409 | -7 |
| 1998-07-12 | vs CHN | 89 | L 0-3 | 45-44 | 3 | 50,735 | Brad Woodall | Mark Clark | Mark Clark | Brad Woodall | | 402 | 412 | -10 |
| 1998-07-13 | vs PHI | 90 | W 4-2 | 46-44 | 3 | 17,230 | Steve Woodard | Tyler Green | Steve Woodard | Tyler Green | Bob Wickman | 406 | 414 | -8 |
| 1998-07-14 | vs PHI | 91 | L 2-4 | 46-45 | 3 | 16,861 | Jeff Juden | Matt Beech | Wayne Gomes | Jeff Juden | Mark Leiter | 408 | 418 | -10 |
| 1998-07-15 | vs PHI | 92 | W 3-2 | 47-45 | 3 | 20,554 | Scott Karl | Curt Schilling | Scott Karl | Curt Schilling | Bob Wickman | 411 | 420 | -9 |
| 1998-07-16 | @ ATL | 93 | L 3-4 | 47-46 | 3 | 46,098 | Cal Eldred | Greg Maddux | Greg Maddux | Cal Eldred | Rudy Seanez | 414 | 424 | -10 |
| 1998-07-17 | @ ATL | 94 | L 1-4 | 47-47 | 3 | 48,544 | Brad Woodall | Tom Glavine | Tom Glavine | Brad Woodall | John Rocker | 415 | 428 | -13 |
| 1998-07-18 | @ ATL | 95 | W 7-1 | 48-47 | 3 | 50,284 | Steve Woodard | Kevin Millwood | Steve Woodard | Kevin Millwood | | 422 | 429 | -7 |
| 1998-07-19 | @ ATL | 96 | L 6-11 | 48-48 | 3 | 44,598 | Jeff Juden | John Smoltz | John Smoltz | Jeff Juden | | 428 | 440 | -12 |
| 1998-07-20 | @ FLO | 97 | W 5-3 | 49-48 | 3 | 12,759 | Scott Karl | Livan Hernandez | Scott Karl | Livan Hernandez | Bob Wickman | 433 | 443 | -10 |
| 1998-07-21 | @ FLO | 98 | W 6-4 | 50-48 | 3 | 15,325 | Cal Eldred | Jesus Sanchez | Alberto Reyes | Antonio Alfonseca | | 439 | 447 | -8 |
| 1998-07-22 | vs NYN | 99 | L 5-7 | 50-50 | 3 | 0 | Brad Woodall | Bill Pulsipher | Dennis Cook | Bob Wickman | John Franco | 444 | 454 | -10 |
| 1998-07-22 | vs NYN | 100 | L 1-6 | 50-50 | 3 | 23,920 | Bronswell Patrick | Hideo Nomo | Hideo Nomo | Bronswell Patrick | | 445 | 460 | -15 |
| 1998-07-23 | vs NYN | 101 | L 5-6 | 50-51 | 3 | 27,046 | Steve Woodard | Al Leiter | Greg McMichael | Mike Myers | John Franco | 450 | 466 | -16 |
| 1998-07-24 | vs MON | 102 | W 10-7 | 51-52 | 3 | 0 | Jeff Juden | Dustin Hermanson | David Weathers | Dustin Hermanson | | 460 | 473 | -13 |
| 1998-07-24 | vs MON | 103 | L 2-11 | 51-52 | 3 | 16,297 | Paul Wagner | Mike Thurman | Mike Thurman | Paul Wagner | | 462 | 484 | -22 |
| 1998-07-25 | vs MON | 104 | W 4-3 | 52-52 | 3 | 28,074 | Scott Karl | Carlos Perez | Bob Wickman | Anthony Telford | | 466 | 487 | -21 |
| 1998-07-26 | vs MON | 105 | W 6-5 | 53-52 | 3 | 24,553 | Cal Eldred | Carl Pavano | Bob Wickman | Shayne Bennett | | 472 | 492 | -20 |
| 1998-07-28 | @ SLN | 106 | W 13-10 | 54-52 | 3 | 36,812 | Brad Woodall | Kent Bottenfield | David Weathers | Rich Croushore | Bob Wickman | 485 | 502 | -17 |
| 1998-07-29 | @ SLN | 107 | W 2-1 | 55-52 | 3 | 36,672 | Steve Woodard | Bobby Witt | Steve Woodard | Bobby Witt | Bob Wickman | 487 | 503 | -16 |
| 1998-07-30 | @ SLN | 108 | L 2-3 | 55-53 | 3 | 35,766 | Scott Karl | Matt Morris | Matt Morris | Scott Karl | Rich Croushore | 489 | 506 | -17 |
| 1998-07-31 | vs ARI | 109 | L 2-8 | 55-54 | 3 | 27,274 | Jeff Juden | Andy Benes | Andy Benes | Jeff Juden | | 491 | 514 | -23 |
| 1998-08-01 | vs ARI | 110 | L 4-5 | 55-55 | 3 | 24,370 | Rafael Roque | Clint Sodowsky | Willie Banks | Chad Fox | Gregg Olson | 495 | 519 | -24 |
| 1998-08-02 | vs ARI | 111 | W 7-2 | 56-55 | 3 | 29,457 | Brad Woodall | Brian Anderson | Brad Woodall | Brian Anderson | | 502 | 521 | -19 |
| 1998-08-03 | vs SLN | 112 | W 6-5 | 57-55 | 3 | 31,659 | Steve Woodard | Darren Oliver | Steve Woodard | Darren Oliver | Bob Wickman | 508 | 526 | -18 |
| 1998-08-04 | vs SLN | 113 | L 1-2 | 57-56 | 3 | 28,389 | Scott Karl | Matt Morris | Matt Morris | Scott Karl | | 509 | 528 | -19 |
| 1998-08-05 | vs SLN | 114 | L 1-5 | 57-57 | 3 | 25,969 | Jeff Juden | Kent Mercker | Kent Mercker | Jeff Juden | | 510 | 533 | -23 |
| 1998-08-07 | @ CIN | 115 | L 0-17 | 57-58 | 3 | 20,908 | Brad Woodall | Pete Harnisch | Pete Harnisch | Brad Woodall | | 510 | 550 | -40 |
| 1998-08-08 | @ CIN | 116 | L 0-4 | 57-59 | 3 | 23,906 | Steve Woodard | Dennys Reyes | Dennys Reyes | Steve Woodard | | 510 | 554 | -44 |
| 1998-08-09 | @ CIN | 117 | W 4-3 | 58-59 | 3 | 21,976 | Scott Karl | Steve Parris | Scott Karl | Steve Parris | Bob Wickman | 514 | 557 | -43 |
| 1998-08-10 | @ HOU | 118 | L 2-5 | 58-60 | 3 | 18,995 | Bill Pulsipher | Mike Hampton | Scott Elarton | Chad Fox | Billy Wagner | 516 | 562 | -46 |
| 1998-08-11 | @ HOU | 119 | L 5-6 | 58-61 | 3 | 20,553 | Bronswell Patrick | Sean Bergman | Mike Magnante | Eric Plunk | | 521 | 568 | -47 |
| 1998-08-12 | @ HOU | 120 | L 0-3 | 58-62 | 3 | 40,217 | Brad Woodall | Randy Johnson | Randy Johnson | Brad Woodall | | 521 | 571 | -50 |
| 1998-08-13 | @ HOU | 121 | L 2-6 | 58-63 | 3 | 21,218 | Steve Woodard | Jose Lima | Jose Lima | Steve Woodard | | 523 | 577 | -54 |
| 1998-08-14 | @ SDN | 122 | L 0-7 | 58-64 | 4 | 38,639 | Scott Karl | Sterling Hitchcock | Sterling Hitchcock | Scott Karl | | 523 | 584 | -61 |
| 1998-08-16 | @ SDN | 123 | L 0-4 | 59-65 | 4 | 0 | Rafael Roque | Kevin Brown | Kevin Brown | Rafael Roque | | 523 | 588 | -65 |
| 1998-08-16 | @ SDN | 124 | W 4-2 | 59-65 | 4 | 29,319 | Bill Pulsipher | Joey Hamilton | Bill Pulsipher | Joey Hamilton | Bob Wickman | 527 | 590 | -63 |
| 1998-08-18 | vs CIN | 125 | W 8-4 | 60-65 | 3 | 15,671 | Brad Woodall | Mike Remlinger | Brad Woodall | Mike Remlinger | | 535 | 594 | -59 |
| 1998-08-19 | vs CIN | 126 | L 2-8 | 60-66 | 4 | 20,533 | Steve Woodard | Pete Harnisch | Pete Harnisch | Steve Woodard | | 537 | 602 | -65 |
| 1998-08-20 | vs HOU | 127 | W 6-5 | 61-66 | 4 | 17,589 | Scott Karl | Mike Hampton | Bob Wickman | Mike Magnante | | 543 | 607 | -64 |
| 1998-08-21 | vs HOU | 128 | L 2-5 | 61-67 | 4 | 26,820 | Bill Pulsipher | Sean Bergman | Sean Bergman | Bill Pulsipher | Jay Powell | 545 | 612 | -67 |
| 1998-08-22 | vs SDN | 129 | W 8-4 | 62-67 | 3 | 26,253 | Rafael Roque | Mark Langston | Rafael Roque | Mark Langston | Bob Wickman | 553 | 616 | -63 |
| 1998-08-23 | vs SDN | 130 | L 11-13 | 62-68 | 3 | 27,641 | Brad Woodall | Andy Ashby | Trevor Hoffman | Bob Wickman | | 564 | 629 | -65 |
| 1998-08-24 | vs SDN | 131 | L 2-7 | 62-69 | 4 | 14,121 | Steve Woodard | Sterling Hitchcock | Sterling Hitchcock | Steve Woodard | | 566 | 636 | -70 |
| 1998-08-25 | @ COL | 132 | L 6-11 | 62-70 | 4 | 44,573 | Scott Karl | Darryl Kile | Dave Veres | David Weathers | | 572 | 647 | -75 |
| 1998-08-26 | @ COL | 133 | W 6-5 | 63-70 | 4 | 42,395 | Bill Pulsipher | Jamey Wright | Bill Pulsipher | Jamey Wright | | 578 | 652 | -74 |
| 1998-08-27 | @ ARI | 134 | W 4-0 | 64-70 | 4 | 40,856 | Rafael Roque | Andy Benes | Rafael Roque | Andy Benes | Eric Plunk | 582 | 652 | -70 |
| 1998-08-28 | @ ARI | 135 | L 3-6 | 64-71 | 4 | 41,505 | Brad Woodall | Brian Anderson | Brian Anderson | Brad Woodall | Gregg Olson | 585 | 658 | -73 |
| 1998-08-29 | @ ARI | 136 | L 3-4 | 64-72 | 5 | 44,920 | Steve Woodard | Amaury Telemaco | Aaron Small | Bob Wickman | | 588 | 662 | -74 |
| 1998-08-30 | @ ARI | 137 | L 3-7 | 64-73 | 5 | 40,508 | Scott Karl | Clint Sodowsky | Clint Sodowsky | Scott Karl | | 591 | 669 | -78 |
| 1998-09-01 | vs COL | 138 | L 3-12 | 64-74 | 6 | 13,347 | Bill Pulsipher | Jamey Wright | Jamey Wright | Bill Pulsipher | | 594 | 681 | -87 |
| 1998-09-02 | vs COL | 139 | W 8-4 | 65-74 | 5 | 10,584 | Rafael Roque | Pedro Astacio | Rafael Roque | Pedro Astacio | | 602 | 685 | -83 |
| 1998-09-03 | vs COL | 140 | W 7-3 | 66-74 | 4 | 12,327 | Brad Woodall | John Thomson | Brad Woodall | John Thomson | | 609 | 688 | -79 |
| 1998-09-04 | vs PHI | 141 | L 2-6 | 66-75 | 5 | 17,160 | Steve Woodard | Curt Schilling | Curt Schilling | Steve Woodard | | 611 | 694 | -83 |
| 1998-09-05 | vs PHI | 142 | W 3-2 | 67-75 | 4 | 15,935 | Scott Karl | Carlton Loewer | David Weathers | Ricky Bottalico | | 614 | 696 | -82 |
| 1998-09-06 | vs PHI | 143 | W 5-4 | 68-75 | 4 | 17,733 | Bill Pulsipher | Mark Portugal | David Weathers | Wayne Gomes | | 619 | 700 | -81 |
| 1998-09-07 | @ PIT | 144 | W 6-3 | 69-75 | 4 | 12,830 | Rafael Roque | Elmer Dessens | Rafael Roque | Elmer Dessens | Bob Wickman | 625 | 703 | -78 |
| 1998-09-08 | @ PIT | 145 | L 7-8 | 69-76 | 4 | 7,171 | Brad Woodall | Francisco Cordova | Mike Williams | Eric Plunk | Rich Loiselle | 632 | 711 | -79 |
| 1998-09-09 | @ HOU | 146 | L 2-6 | 69-77 | 4 | 24,462 | Steve Woodard | Jose Lima | Jose Lima | Steve Woodard | Billy Wagner | 634 | 717 | -83 |
| 1998-09-10 | @ HOU | 147 | L 1-7 | 69-78 | 4 | 20,813 | Scott Karl | Shane Reynolds | Shane Reynolds | Scott Karl | | 635 | 724 | -89 |
| 1998-09-11 | @ CHN | 148 | W 13-11 | 70-78 | 4 | 37,410 | Bill Pulsipher | Don Wengert | Eric Plunk | Don Wengert | Bob Wickman | 648 | 735 | -87 |
| 1998-09-12 | @ CHN | 149 | L 12-15 | 70-79 | 4 | 39,170 | Rafael Roque | Mike Morgan | Rod Beck | Bob Wickman | | 660 | 750 | -90 |
| 1998-09-13 | @ CHN | 150 | L 10-11 | 70-80 | 4 | 40,846 | Brad Woodall | Steve Trachsel | Rod Beck | Alberto Reyes | | 670 | 761 | -91 |
| 1998-09-14 | @ CIN | 151 | W 2-1 | 71-80 | 4 | 13,291 | Steve Woodard | Pete Harnisch | Steve Woodard | Pete Harnisch | Bob Wickman | 672 | 762 | -90 |
| 1998-09-15 | @ CIN | 152 | L 1-5 | 71-81 | 4 | 13,785 | Scott Karl | Mike Remlinger | Mike Remlinger | Scott Karl | Danny Graves | 673 | 767 | -94 |
| 1998-09-16 | @ CIN | 153 | W 2-0 | 72-81 | 4 | 14,467 | Bill Pulsipher | Brett Tomko | Bill Pulsipher | Brett Tomko | Bob Wickman | 675 | 767 | -92 |
| 1998-09-18 | vs SLN | 154 | L 2-5 | 72-82 | 4 | 48,194 | Rafael Roque | Darren Oliver | Darren Oliver | Rafael Roque | Juan Acevedo | 677 | 772 | -95 |
| 1998-09-19 | vs SLN | 155 | L 4-7 | 72-83 | 5 | 54,132 | Steve Woodard | Jose Jimenez | Jose Jimenez | Steve Woodard | Juan Acevedo | 681 | 779 | -98 |
| 1998-09-20 | vs SLN | 156 | L 6-11 | 72-84 | 5 | 52,831 | Scott Karl | Kent Mercker | Manny Aybar | Scott Karl | | 687 | 790 | -103 |
| 1998-09-22 | vs CHN | 157 | L 2-5 | 72-85 | 5 | 52,287 | Bill Pulsipher | Terry Mulholland | Terry Mulholland | Bill Pulsipher | | 689 | 795 | -106 |
| 1998-09-23 | vs CHN | 158 | W 8-7 | 73-85 | 5 | 45,338 | Rafael Roque | Steve Trachsel | Chad Fox | Rod Beck | | 697 | 802 | -105 |
| 1998-09-24 | @ LAN | 159 | L 1-4 | 73-86 | 5 | 30,024 | Steve Woodard | Dave Mlicki | Eric Weaver | Chad Fox | Jeff Shaw | 698 | 806 | -108 |
| 1998-09-25 | @ LAN | 160 | L 2-3 | 73-87 | 5 | 36,059 | Brad Woodall | Ismael Valdez | Ismael Valdez | Brad Woodall | Jeff Shaw | 700 | 809 | -109 |
| 1998-09-26 | @ LAN | 161 | W 6-1 | 74-87 | 5 | 30,645 | Scott Karl | Carlos Perez | Scott Karl | Carlos Perez | | 706 | 810 | -104 |
| 1998-09-27 | @ LAN | 162 | L 1-2 | 74-88 | 5 | 46,696 | Bill Pulsipher | Chan Ho Park | Chan Ho Park | Bill Pulsipher | Jeff Shaw | 707 | 812 | -105 |