| 1998-03-31 | vs COL | 1 | L 2-9 | 0-1 | 4 | 47,484 | Andy Benes | Darryl Kile | Darryl Kile | Andy Benes | | 2 | 9 | -7 |
| 1998-04-01 | vs COL | 2 | L 0-6 | 0-2 | 4 | 43,758 | Willie Blair | John Thomson | John Thomson | Willie Blair | | 2 | 15 | -13 |
| 1998-04-02 | vs COL | 3 | L 4-6 | 0-3 | 4 | 42,876 | Brian Anderson | Pedro Astacio | Pedro Astacio | Brian Anderson | Jerry DiPoto | 6 | 21 | -15 |
| 1998-04-03 | vs SFN | 4 | L 3-8 | 0-4 | 4 | 45,590 | Jeff Suppan | Mark Gardner | Mark Gardner | Jeff Suppan | | 9 | 29 | -20 |
| 1998-04-04 | vs SFN | 5 | L 3-5 | 0-5 | 4 | 47,047 | Joel Adamson | Danny Darwin | Danny Darwin | Gregg Olson | Robb Nen | 12 | 34 | -22 |
| 1998-04-05 | vs SFN | 6 | W 3-2 | 1-5 | 5 | 47,593 | Andy Benes | Shawn Estes | Andy Benes | Shawn Estes | Felix Rodriguez | 15 | 36 | -21 |
| 1998-04-07 | @ LAN | 7 | L 1-9 | 1-6 | 5 | 52,424 | Willie Blair | Chan Ho Park | Chan Ho Park | Willie Blair | | 16 | 45 | -29 |
| 1998-04-08 | @ LAN | 8 | W 3-0 | 2-6 | 5 | 37,016 | Brian Anderson | Hideo Nomo | Brian Anderson | Hideo Nomo | Felix Rodriguez | 19 | 45 | -26 |
| 1998-04-09 | @ LAN | 9 | L 2-7 | 2-7 | 5 | 39,541 | Jeff Suppan | Ismael Valdez | Ismael Valdez | Jeff Suppan | | 21 | 52 | -31 |
| 1998-04-10 | @ SDN | 10 | L 4-6 | 2-8 | 5 | 27,243 | Andy Benes | Kevin Brown | Dan Miceli | Felix Rodriguez | | 25 | 58 | -33 |
| 1998-04-11 | @ SDN | 11 | L 0-7 | 2-9 | 5 | 37,753 | Joel Adamson | Pete Smith | Pete Smith | Joel Adamson | | 25 | 65 | -40 |
| 1998-04-12 | @ SDN | 12 | L 2-4 | 2-10 | 5 | 26,217 | Willie Blair | Joey Hamilton | Joey Hamilton | Willie Blair | Trevor Hoffman | 27 | 69 | -42 |
| 1998-04-13 | @ SDN | 13 | L 0-1 | 2-11 | 5 | 36,278 | Brian Anderson | Andy Ashby | Andy Ashby | Brian Anderson | | 27 | 70 | -43 |
| 1998-04-14 | @ SLN | 14 | L 5-15 | 2-12 | 5 | 31,477 | Jeff Suppan | Kent Mercker | Mike Busby | Clint Sodowsky | | 32 | 85 | -53 |
| 1998-04-16 | @ SLN | 15 | L 4-5 | 3-13 | 5 | 0 | Joel Adamson | Todd Stottlemyre | Todd Stottlemyre | Joel Adamson | Jeff Brantley | 36 | 90 | -54 |
| 1998-04-16 | @ SLN | 16 | W 8-2 | 3-13 | 5 | 32,039 | Andy Benes | Donovan Osborne | Andy Benes | Donovan Osborne | | 44 | 92 | -48 |
| 1998-04-17 | vs FLO | 17 | W 7-5 | 4-13 | 5 | 47,401 | Willie Blair | Rafael Medina | Russ Springer | Vic Darensbourg | Felix Rodriguez | 51 | 97 | -46 |
| 1998-04-18 | vs FLO | 18 | W 7-5 | 5-13 | 5 | 46,910 | Brian Anderson | Andy Larkin | Barry Manuel | Antonio Alfonseca | Felix Rodriguez | 58 | 102 | -44 |
| 1998-04-19 | vs FLO | 19 | L 3-4 | 5-14 | 5 | 47,339 | Jeff Suppan | Brian Meadows | Brian Meadows | Jeff Suppan | Rob Stanifer | 61 | 106 | -45 |
| 1998-04-20 | vs FLO | 20 | W 15-4 | 6-14 | 5 | 45,256 | Joel Adamson | Livan Hernandez | Clint Sodowsky | Livan Hernandez | | 76 | 110 | -34 |
| 1998-04-22 | @ ATL | 21 | L 2-5 | 6-15 | 5 | 30,952 | Andy Benes | John Smoltz | John Smoltz | Andy Benes | | 78 | 115 | -37 |
| 1998-04-23 | @ ATL | 22 | L 1-3 | 6-16 | 5 | 33,013 | Willie Blair | Tom Glavine | Tom Glavine | Willie Blair | Mark Wohlers | 79 | 118 | -39 |
| 1998-04-24 | @ ATL | 23 | L 5-6 | 6-17 | 5 | 41,514 | Brian Anderson | Denny Neagle | Kerry Ligtenberg | Russ Springer | | 84 | 124 | -40 |
| 1998-04-25 | @ FLO | 24 | W 4-3 | 7-17 | 5 | 28,710 | Jeff Suppan | Livan Hernandez | Scott Brow | Vic Darensbourg | Felix Rodriguez | 88 | 127 | -39 |
| 1998-04-26 | @ FLO | 25 | L 6-12 | 7-18 | 5 | 24,782 | Joel Adamson | Eric Ludwick | Eric Ludwick | Joel Adamson | | 94 | 139 | -45 |
| 1998-04-27 | vs ATL | 26 | L 5-6 | 7-19 | 5 | 47,410 | Andy Benes | John Smoltz | Mike Cather | Omar Daal | Mark Wohlers | 99 | 145 | -46 |
| 1998-04-28 | vs ATL | 27 | L 2-12 | 7-20 | 5 | 47,593 | Willie Blair | Tom Glavine | Tom Glavine | Willie Blair | | 101 | 157 | -56 |
| 1998-05-01 | @ MON | 28 | L 4-7 | 7-21 | 5 | 6,952 | Brian Anderson | Javier Vazquez | Javier Vazquez | Brian Anderson | Ugueth Urbina | 105 | 164 | -59 |
| 1998-05-02 | @ MON | 29 | L 4-5 | 7-22 | 5 | 8,026 | Andy Benes | Carlos Perez | Shayne Bennett | Russ Springer | | 109 | 169 | -60 |
| 1998-05-03 | @ MON | 30 | L 1-4 | 7-23 | 5 | 10,467 | Willie Blair | Dustin Hermanson | Dustin Hermanson | Willie Blair | | 110 | 173 | -63 |
| 1998-05-04 | @ NYN | 31 | W 4-2 | 8-23 | 5 | 18,980 | Jeff Suppan | Al Leiter | Gregg Olson | Brian Bohanon | | 114 | 175 | -61 |
| 1998-05-05 | @ NYN | 32 | L 1-9 | 8-24 | 5 | 13,205 | Omar Daal | Dave Mlicki | Dave Mlicki | Omar Daal | | 115 | 184 | -69 |
| 1998-05-06 | @ NYN | 33 | L 2-8 | 8-25 | 5 | 17,681 | Brian Anderson | Bobby Jones | Mel Rojas | Clint Sodowsky | | 117 | 192 | -75 |
| 1998-05-07 | @ PHI | 34 | L 1-4 | 8-26 | 5 | 13,838 | Andy Benes | Curt Schilling | Curt Schilling | Andy Benes | Mark Leiter | 118 | 196 | -78 |
| 1998-05-08 | @ PHI | 35 | L 4-6 | 8-27 | 5 | 13,259 | Willie Blair | Tyler Green | Tyler Green | Gregg Olson | Mark Leiter | 122 | 202 | -80 |
| 1998-05-10 | @ PHI | 36 | L 4-7 | 8-28 | 5 | 18,520 | Jeff Suppan | Mike Grace | Darrin Winston | Jeff Suppan | Mark Leiter | 126 | 209 | -83 |
| 1998-05-11 | vs CHN | 37 | L 2-4 | 8-29 | 5 | 47,129 | Brian Anderson | Kerry Wood | Kerry Wood | Brian Anderson | Rod Beck | 128 | 213 | -85 |
| 1998-05-12 | vs CHN | 38 | L 6-7 | 8-30 | 5 | 45,240 | Andy Benes | Terry Mulholland | Terry Adams | Felix Rodriguez | Rod Beck | 134 | 220 | -86 |
| 1998-05-13 | vs MIL | 39 | L 3-8 | 8-31 | 5 | 40,230 | Willie Blair | Jeff Juden | Jeff Juden | Willie Blair | Bob Wickman | 137 | 228 | -91 |
| 1998-05-14 | vs MIL | 40 | W 4-1 | 9-31 | 5 | 40,204 | Omar Daal | Cal Eldred | Russ Springer | Cal Eldred | Gregg Olson | 141 | 229 | -88 |
| 1998-05-15 | vs PIT | 41 | W 6-1 | 10-31 | 5 | 43,584 | Jeff Suppan | Francisco Cordova | Jeff Suppan | Francisco Cordova | | 147 | 230 | -83 |
| 1998-05-16 | vs PIT | 42 | L 3-6 | 10-32 | 5 | 48,167 | Brian Anderson | Jason Schmidt | Jason Schmidt | Brian Anderson | Rich Loiselle | 150 | 236 | -86 |
| 1998-05-17 | vs PIT | 43 | W 8-2 | 11-32 | 5 | 44,014 | Andy Benes | Esteban Loaiza | Andy Benes | Esteban Loaiza | | 158 | 238 | -80 |
| 1998-05-18 | vs PIT | 44 | W 9-2 | 12-32 | 5 | 41,465 | Willie Blair | Jon Lieber | Willie Blair | Jon Lieber | | 167 | 240 | -73 |
| 1998-05-20 | @ FLO | 45 | W 7-3 | 13-32 | 5 | 17,560 | Omar Daal | Andy Larkin | Omar Daal | Andy Larkin | Gregg Olson | 174 | 243 | -69 |
| 1998-05-21 | @ FLO | 46 | W 6-4 | 14-32 | 5 | 15,116 | Jeff Suppan | Brian Meadows | Amaury Telemaco | Vic Darensbourg | Gregg Olson | 180 | 247 | -67 |
| 1998-05-22 | vs LAN | 47 | L 0-5 | 14-33 | 5 | 48,299 | Andy Benes | Darren Dreifort | Darren Dreifort | Andy Benes | | 180 | 252 | -72 |
| 1998-05-23 | vs LAN | 48 | L 1-7 | 14-34 | 5 | 48,369 | Brian Anderson | Ramon Martinez | Ramon Martinez | Brian Anderson | | 181 | 259 | -78 |
| 1998-05-24 | vs LAN | 49 | W 8-5 | 15-34 | 5 | 48,682 | Willie Blair | Chan Ho Park | Willie Blair | Chan Ho Park | Gregg Olson | 189 | 264 | -75 |
| 1998-05-25 | vs SDN | 50 | W 3-2 | 16-34 | 5 | 45,367 | Omar Daal | Andy Ashby | Russ Springer | Andy Ashby | Gregg Olson | 192 | 266 | -74 |
| 1998-05-26 | vs SDN | 51 | L 1-12 | 16-35 | 5 | 41,204 | Jeff Suppan | Kevin Brown | Kevin Brown | Jeff Suppan | | 193 | 278 | -85 |
| 1998-05-27 | vs SDN | 52 | L 4-6 | 16-36 | 5 | 42,844 | Andy Benes | Sterling Hitchcock | Donne Wall | Andy Benes | Trevor Hoffman | 197 | 284 | -87 |
| 1998-05-28 | @ SFN | 53 | W 8-7 | 17-36 | 5 | 12,066 | Brian Anderson | Danny Darwin | Brian Anderson | Danny Darwin | Gregg Olson | 205 | 291 | -86 |
| 1998-05-29 | @ SFN | 54 | L 1-3 | 17-37 | 5 | 16,859 | Willie Blair | Shawn Estes | Shawn Estes | Willie Blair | Robb Nen | 206 | 294 | -88 |
| 1998-05-30 | @ SFN | 55 | L 1-4 | 17-38 | 5 | 28,185 | Omar Daal | Orel Hershiser | Orel Hershiser | Omar Daal | Robb Nen | 207 | 298 | -91 |
| 1998-05-31 | @ SFN | 56 | L 4-7 | 17-39 | 5 | 35,800 | Jeff Suppan | Kirk Rueter | Kirk Rueter | Jeff Suppan | | 211 | 305 | -94 |
| 1998-06-01 | @ COL | 57 | W 6-4 | 18-39 | 5 | 48,020 | Andy Benes | Darryl Kile | Andy Benes | Darryl Kile | Gregg Olson | 217 | 309 | -92 |
| 1998-06-02 | @ COL | 58 | W 9-3 | 19-39 | 5 | 47,905 | Brian Anderson | Jamey Wright | Brian Anderson | Jamey Wright | | 226 | 312 | -86 |
| 1998-06-03 | @ COL | 59 | L 2-3 | 19-40 | 5 | 46,279 | Willie Blair | Pedro Astacio | Chuck McElroy | Gregg Olson | | 228 | 315 | -87 |
| 1998-06-04 | @ COL | 60 | L 2-5 | 19-41 | 5 | 46,295 | Omar Daal | John Thomson | John Thomson | Omar Daal | | 230 | 320 | -90 |
| 1998-06-05 | @ OAK | 61 | L 1-2 | 19-42 | 5 | 9,082 | Bob Wolcott | Kenny Rogers | Mike Mohler | Russ Springer | | 231 | 322 | -91 |
| 1998-06-06 | @ OAK | 62 | L 5-10 | 19-43 | 5 | 18,458 | Andy Benes | Mike Oquist | Mike Oquist | Andy Benes | | 236 | 332 | -96 |
| 1998-06-07 | @ OAK | 63 | W 12-4 | 20-43 | 5 | 17,420 | Brian Anderson | Tom Candiotti | Brian Anderson | Tom Candiotti | | 248 | 336 | -88 |
| 1998-06-09 | vs ANA | 64 | L 8-10 | 20-44 | 5 | 43,074 | Willie Blair | Chuck Finley | Chuck Finley | Clint Sodowsky | Troy Percival | 256 | 346 | -90 |
| 1998-06-10 | vs ANA | 65 | W 10-2 | 21-44 | 5 | 40,819 | Omar Daal | Ken Hill | Omar Daal | Ken Hill | | 266 | 348 | -82 |
| 1998-06-11 | vs ANA | 66 | L 5-10 | 21-45 | 5 | 41,954 | Bob Wolcott | Jason Dickson | Jason Dickson | Bob Wolcott | Troy Percival | 271 | 358 | -87 |
| 1998-06-12 | vs SLN | 67 | L 4-9 | 21-46 | 5 | 48,169 | Andy Benes | Todd Stottlemyre | Todd Stottlemyre | Andy Benes | | 275 | 367 | -92 |
| 1998-06-13 | vs SLN | 68 | W 7-4 | 22-46 | 5 | 48,172 | Brian Anderson | Kent Mercker | Russ Springer | Jeff Brantley | Gregg Olson | 282 | 371 | -89 |
| 1998-06-14 | vs SLN | 69 | L 0-2 | 22-47 | 5 | 48,166 | Willie Blair | Mark Petkovsek | Mark Petkovsek | Willie Blair | Kent Bottenfield | 282 | 373 | -91 |
| 1998-06-16 | @ CIN | 70 | W 5-1 | 23-47 | 5 | 15,975 | Omar Daal | Pete Harnisch | Omar Daal | Pete Harnisch | | 287 | 374 | -87 |
| 1998-06-17 | @ CIN | 71 | W 4-1 | 24-47 | 5 | 20,029 | Andy Benes | Mike Remlinger | Andy Benes | Mike Remlinger | Gregg Olson | 291 | 375 | -84 |
| 1998-06-18 | @ CIN | 72 | W 4-2 | 25-47 | 5 | 21,944 | Brian Anderson | Scott Klingenbeck | Brian Anderson | Scott Klingenbeck | Gregg Olson | 295 | 377 | -82 |
| 1998-06-19 | @ SLN | 73 | L 0-5 | 25-48 | 5 | 44,949 | Willie Blair | Mark Petkovsek | Mark Petkovsek | Willie Blair | | 295 | 382 | -87 |
| 1998-06-20 | @ SLN | 74 | L 2-4 | 25-49 | 5 | 47,632 | Amaury Telemaco | Manny Aybar | Manny Aybar | Willie Banks | Rich Croushore | 297 | 386 | -89 |
| 1998-06-21 | @ SLN | 75 | L 4-5 | 25-50 | 5 | 45,517 | Omar Daal | Juan Acevedo | Brady Raggio | Clint Sodowsky | Jeff Brantley | 301 | 391 | -90 |
| 1998-06-22 | @ TEX | 76 | W 6-0 | 26-50 | 5 | 37,840 | Andy Benes | John Burkett | Andy Benes | John Burkett | | 307 | 391 | -84 |
| 1998-06-23 | @ TEX | 77 | L 5-16 | 26-51 | 5 | 31,904 | Brian Anderson | Aaron Sele | Aaron Sele | Brian Anderson | | 312 | 407 | -95 |
| 1998-06-24 | vs TEX | 78 | L 2-3 | 26-52 | 5 | 44,296 | Willie Blair | Rick Helling | Rick Helling | Willie Blair | John Wetteland | 314 | 410 | -96 |
| 1998-06-25 | vs TEX | 79 | L 4-9 | 26-53 | 5 | 44,269 | Amaury Telemaco | Todd Van Poppel | Todd Van Poppel | Amaury Telemaco | | 318 | 419 | -101 |
| 1998-06-26 | vs SEA | 80 | W 13-8 | 27-53 | 5 | 49,328 | Jeff Suppan | Bill Swift | Clint Sodowsky | Paul Spoljaric | | 331 | 427 | -96 |
| 1998-06-27 | vs SEA | 81 | L 4-6 | 27-54 | 5 | 48,488 | Andy Benes | Jeff Fassero | Jeff Fassero | Andy Benes | Heathcliff Slocumb | 335 | 433 | -98 |
| 1998-06-28 | vs SEA | 82 | W 3-2 | 28-54 | 5 | 47,968 | Brian Anderson | Jamie Moyer | Alan Embree | Bobby Ayala | | 338 | 435 | -97 |
| 1998-06-30 | @ CHN | 83 | W 5-4 | 29-54 | 5 | 39,307 | Willie Blair | Mark Clark | Willie Blair | Mark Clark | Gregg Olson | 343 | 439 | -96 |
| 1998-07-01 | @ CHN | 84 | L 4-6 | 29-55 | 5 | 31,002 | Amaury Telemaco | Kerry Wood | Kerry Wood | Amaury Telemaco | Rod Beck | 347 | 445 | -98 |
| 1998-07-02 | @ CHN | 85 | L 2-3 | 29-56 | 5 | 29,268 | Jeff Suppan | Steve Trachsel | Steve Trachsel | Jeff Suppan | Rod Beck | 349 | 448 | -99 |
| 1998-07-03 | @ HOU | 86 | L 5-6 | 29-57 | 5 | 34,382 | Andy Benes | Shane Reynolds | Shane Reynolds | Andy Benes | Billy Wagner | 354 | 454 | -100 |
| 1998-07-04 | @ HOU | 87 | W 7-4 | 30-57 | 5 | 31,477 | Brian Anderson | Mike Hampton | Brian Anderson | Mike Hampton | | 361 | 458 | -97 |
| 1998-07-05 | @ HOU | 88 | L 2-5 | 30-58 | 5 | 23,607 | Willie Blair | Sean Bergman | Sean Bergman | Willie Blair | Billy Wagner | 363 | 463 | -100 |
| 1998-07-10 | vs CIN | 89 | L 4-5 | 30-59 | 5 | 45,278 | Andy Benes | Brett Tomko | Brett Tomko | Andy Benes | | 367 | 468 | -101 |
| 1998-07-11 | vs CIN | 90 | L 0-8 | 30-60 | 5 | 47,323 | Willie Blair | Mike Remlinger | Mike Remlinger | Willie Blair | | 367 | 476 | -109 |
| 1998-07-12 | vs CIN | 91 | L 3-5 | 30-61 | 5 | 42,329 | Brian Anderson | Pete Harnisch | John Hudek | Brian Anderson | | 370 | 481 | -111 |
| 1998-07-13 | vs HOU | 92 | W 5-3 | 31-61 | 5 | 40,007 | Amaury Telemaco | Pete Schourek | Amaury Telemaco | Pete Schourek | Gregg Olson | 375 | 484 | -109 |
| 1998-07-14 | vs HOU | 93 | L 2-4 | 31-62 | 5 | 40,419 | Omar Daal | Shane Reynolds | Shane Reynolds | Omar Daal | Billy Wagner | 377 | 488 | -111 |
| 1998-07-15 | vs HOU | 94 | W 9-8 | 32-62 | 5 | 42,229 | Andy Benes | Mike Hampton | Alan Embree | Mike Magnante | | 386 | 496 | -110 |
| 1998-07-17 | vs COL | 95 | W 9-6 | 33-62 | 5 | 46,322 | Willie Blair | Pedro Astacio | Willie Blair | Pedro Astacio | Gregg Olson | 395 | 502 | -107 |
| 1998-07-18 | vs COL | 96 | W 4-2 | 34-62 | 5 | 48,527 | Brian Anderson | Bobby Jones | Brian Anderson | Bobby Jones | Gregg Olson | 399 | 504 | -105 |
| 1998-07-19 | vs COL | 97 | W 6-4 | 35-62 | 5 | 45,650 | Amaury Telemaco | Darryl Kile | Aaron Small | Mike Munoz | Alan Embree | 405 | 508 | -103 |
| 1998-07-20 | @ SFN | 98 | L 3-5 | 35-63 | 5 | 15,550 | Omar Daal | Russ Ortiz | Rich Rodriguez | Bobby Chouinard | Robb Nen | 408 | 513 | -105 |
| 1998-07-21 | @ SFN | 99 | W 5-3 | 36-63 | 5 | 12,433 | Andy Benes | Orel Hershiser | Andy Benes | Orel Hershiser | Gregg Olson | 413 | 516 | -103 |
| 1998-07-22 | @ SDN | 100 | L 3-9 | 36-64 | 5 | 18,780 | Willie Blair | Andy Ashby | Andy Ashby | Willie Blair | | 416 | 525 | -109 |
| 1998-07-23 | @ SDN | 101 | L 0-3 | 36-65 | 5 | 24,278 | Brian Anderson | Joey Hamilton | Joey Hamilton | Brian Anderson | Trevor Hoffman | 416 | 528 | -112 |
| 1998-07-24 | @ LAN | 102 | L 1-3 | 36-66 | 5 | 36,150 | Amaury Telemaco | Chan Ho Park | Chan Ho Park | Amaury Telemaco | Jeff Shaw | 417 | 531 | -114 |
| 1998-07-25 | @ LAN | 103 | W 5-3 | 37-66 | 5 | 38,937 | Omar Daal | Darren Dreifort | Omar Daal | Darren Dreifort | Gregg Olson | 422 | 534 | -112 |
| 1998-07-26 | @ LAN | 104 | L 3-5 | 37-67 | 5 | 37,353 | Andy Benes | Ismael Valdez | Ismael Valdez | Andy Benes | Jeff Shaw | 425 | 539 | -114 |
| 1998-07-27 | vs CHN | 105 | L 2-6 | 37-68 | 5 | 46,373 | Willie Blair | Steve Trachsel | Steve Trachsel | Willie Blair | | 427 | 545 | -118 |
| 1998-07-28 | vs CHN | 106 | W 7-5 | 38-68 | 5 | 47,190 | Bob Wolcott | Mark Clark | Bob Wolcott | Mark Clark | Gregg Olson | 434 | 550 | -116 |
| 1998-07-29 | vs CHN | 107 | L 3-7 | 38-69 | 5 | 46,738 | Amaury Telemaco | Don Wengert | Don Wengert | Amaury Telemaco | Terry Adams | 437 | 557 | -120 |
| 1998-07-30 | vs CHN | 108 | W 4-0 | 39-69 | 5 | 46,728 | Omar Daal | Kevin Tapani | Omar Daal | Kevin Tapani | | 441 | 557 | -116 |
| 1998-07-31 | @ MIL | 109 | W 8-2 | 40-69 | 5 | 27,274 | Andy Benes | Jeff Juden | Andy Benes | Jeff Juden | | 449 | 559 | -110 |
| 1998-08-01 | @ MIL | 110 | W 5-4 | 41-69 | 5 | 24,370 | Clint Sodowsky | Rafael Roque | Willie Banks | Chad Fox | Gregg Olson | 454 | 563 | -109 |
| 1998-08-02 | @ MIL | 111 | L 2-7 | 41-70 | 5 | 29,457 | Brian Anderson | Brad Woodall | Brad Woodall | Brian Anderson | | 456 | 570 | -114 |
| 1998-08-03 | @ CHN | 112 | W 6-5 | 42-70 | 5 | 38,551 | Amaury Telemaco | Don Wengert | Amaury Telemaco | Don Wengert | Gregg Olson | 462 | 575 | -113 |
| 1998-08-04 | @ CHN | 113 | L 0-2 | 42-71 | 5 | 37,539 | Omar Daal | Kevin Tapani | Kevin Tapani | Omar Daal | Rod Beck | 462 | 577 | -115 |
| 1998-08-05 | @ CHN | 114 | W 10-7 | 43-71 | 5 | 39,664 | Andy Benes | Kerry Wood | Andy Benes | Kerry Wood | Gregg Olson | 472 | 584 | -112 |
| 1998-08-07 | @ MON | 115 | W 6-4 | 44-71 | 5 | 9,798 | Brian Anderson | Javier Vazquez | Brian Anderson | Javier Vazquez | Gregg Olson | 478 | 588 | -110 |
| 1998-08-08 | @ MON | 116 | L 3-5 | 44-72 | 5 | 10,717 | Amaury Telemaco | Dustin Hermanson | Dustin Hermanson | Amaury Telemaco | Ugueth Urbina | 481 | 593 | -112 |
| 1998-08-09 | @ MON | 117 | L 2-8 | 44-73 | 5 | 21,804 | Bob Wolcott | Mike Thurman | Shayne Bennett | Bob Wolcott | Steve Kline | 483 | 601 | -118 |
| 1998-08-10 | vs PHI | 118 | L 0-3 | 44-74 | 5 | 41,711 | Omar Daal | Curt Schilling | Curt Schilling | Omar Daal | | 483 | 604 | -121 |
| 1998-08-11 | vs PHI | 119 | W 7-3 | 45-74 | 5 | 41,298 | Andy Benes | Mark Portugal | Andy Benes | Mark Portugal | | 490 | 607 | -117 |
| 1998-08-12 | vs PHI | 120 | L 4-7 | 45-75 | 5 | 41,510 | Brian Anderson | Mike Grace | Mike Grace | Brian Anderson | Mark Leiter | 494 | 614 | -120 |
| 1998-08-14 | vs NYN | 121 | L 2-3 | 45-76 | 5 | 47,562 | Amaury Telemaco | Rick Reed | Rick Reed | Amaury Telemaco | Turk Wendell | 496 | 617 | -121 |
| 1998-08-15 | vs NYN | 122 | L 4-5 | 45-77 | 5 | 48,307 | Bob Wolcott | Armando Reynoso | Armando Reynoso | Bobby Chouinard | John Franco | 500 | 622 | -122 |
| 1998-08-16 | vs NYN | 123 | W 6-1 | 46-77 | 5 | 44,537 | Omar Daal | Hideo Nomo | Omar Daal | Hideo Nomo | | 506 | 623 | -117 |
| 1998-08-17 | vs MON | 124 | W 6-1 | 47-77 | 5 | 39,367 | Andy Benes | Jeremy Powell | Andy Benes | Jeremy Powell | | 512 | 624 | -112 |
| 1998-08-18 | vs MON | 125 | L 1-7 | 47-78 | 5 | 40,012 | Brian Anderson | Javier Vazquez | Javier Vazquez | Brian Anderson | | 513 | 631 | -118 |
| 1998-08-19 | vs MON | 126 | L 2-8 | 47-79 | 5 | 39,906 | Amaury Telemaco | Dustin Hermanson | Dustin Hermanson | Amaury Telemaco | | 515 | 639 | -124 |
| 1998-08-20 | @ PHI | 127 | L 1-11 | 48-80 | 5 | 0 | Bob Wolcott | Curt Schilling | Curt Schilling | Bob Wolcott | | 516 | 650 | -134 |
| 1998-08-20 | @ PHI | 128 | W 12-9 | 48-80 | 5 | 26,216 | Clint Sodowsky | Ken Ryan | Alan Embree | Ricky Bottalico | | 528 | 659 | -131 |
| 1998-08-21 | @ PHI | 129 | L 0-1 | 48-81 | 5 | 17,144 | Omar Daal | Mark Portugal | Mark Portugal | Omar Daal | Wayne Gomes | 528 | 660 | -132 |
| 1998-08-22 | @ NYN | 130 | L 4-9 | 48-82 | 5 | 42,654 | Andy Benes | Bobby Jones | Bobby Jones | Andy Benes | | 532 | 669 | -137 |
| 1998-08-23 | @ NYN | 131 | W 4-3 | 49-82 | 5 | 36,039 | Brian Anderson | Al Leiter | Brian Anderson | Al Leiter | Gregg Olson | 536 | 672 | -136 |
| 1998-08-24 | @ NYN | 132 | W 9-5 | 50-82 | 5 | 29,850 | Amaury Telemaco | Masato Yoshii | Amaury Telemaco | Masato Yoshii | Willie Banks | 545 | 677 | -132 |
| 1998-08-25 | vs PIT | 133 | L 6-9 | 50-83 | 5 | 38,960 | Clint Sodowsky | Sean Lawrence | Sean Lawrence | Clint Sodowsky | Rich Loiselle | 551 | 686 | -135 |
| 1998-08-26 | vs PIT | 134 | L 3-4 | 50-84 | 5 | 39,906 | Omar Daal | Chris Peters | Jeff Tabaka | Omar Daal | Rich Loiselle | 554 | 690 | -136 |
| 1998-08-27 | vs MIL | 135 | L 0-4 | 50-85 | 5 | 40,856 | Andy Benes | Rafael Roque | Rafael Roque | Andy Benes | Eric Plunk | 554 | 694 | -140 |
| 1998-08-28 | vs MIL | 136 | W 6-3 | 51-85 | 5 | 41,505 | Brian Anderson | Brad Woodall | Brian Anderson | Brad Woodall | Gregg Olson | 560 | 697 | -137 |
| 1998-08-29 | vs MIL | 137 | W 4-3 | 52-85 | 5 | 44,920 | Amaury Telemaco | Steve Woodard | Aaron Small | Bob Wickman | | 564 | 700 | -136 |
| 1998-08-30 | vs MIL | 138 | W 7-3 | 53-85 | 5 | 40,508 | Clint Sodowsky | Scott Karl | Clint Sodowsky | Scott Karl | | 571 | 703 | -132 |
| 1998-09-01 | @ PIT | 139 | W 4-3 | 54-85 | 5 | 11,427 | Omar Daal | Chris Peters | Omar Daal | Chris Peters | Gregg Olson | 575 | 706 | -131 |
| 1998-09-02 | @ PIT | 140 | W 2-1 | 55-85 | 5 | 12,010 | Andy Benes | Elmer Dessens | Aaron Small | Jeff Tabaka | Gregg Olson | 577 | 707 | -130 |
| 1998-09-03 | @ PIT | 141 | W 1-0 | 56-85 | 5 | 8,610 | Brian Anderson | Francisco Cordova | Brian Anderson | Francisco Cordova | | 578 | 707 | -129 |
| 1998-09-04 | vs HOU | 142 | W 3-1 | 57-85 | 5 | 41,396 | Amaury Telemaco | Jose Lima | Amaury Telemaco | Jose Lima | Gregg Olson | 581 | 708 | -127 |
| 1998-09-05 | vs HOU | 143 | L 5-6 | 57-86 | 5 | 43,638 | Clint Sodowsky | Shane Reynolds | Billy Wagner | Alan Embree | | 586 | 714 | -128 |
| 1998-09-06 | vs HOU | 144 | L 1-10 | 57-87 | 5 | 44,076 | Omar Daal | Mike Hampton | Mike Hampton | Omar Daal | | 587 | 724 | -137 |
| 1998-09-07 | vs LAN | 145 | W 4-2 | 58-87 | 5 | 43,316 | Andy Benes | Dave Mlicki | Andy Benes | Dave Mlicki | Gregg Olson | 591 | 726 | -135 |
| 1998-09-08 | vs LAN | 146 | L 5-6 | 58-88 | 5 | 40,262 | Brian Anderson | Ismael Valdez | Jeff Kubenka | Alan Embree | Jeff Shaw | 596 | 732 | -136 |
| 1998-09-09 | vs LAN | 147 | L 2-6 | 58-89 | 5 | 41,092 | Amaury Telemaco | Carlos Perez | Carlos Perez | Amaury Telemaco | | 598 | 738 | -140 |
| 1998-09-11 | @ CIN | 148 | L 1-13 | 58-90 | 5 | 16,579 | Clint Sodowsky | Brett Tomko | Brett Tomko | Clint Sodowsky | | 599 | 751 | -152 |
| 1998-09-12 | @ CIN | 149 | L 0-3 | 58-91 | 5 | 17,463 | Omar Daal | Steve Parris | Steve Parris | Omar Daal | Gabe White | 599 | 754 | -155 |
| 1998-09-13 | @ CIN | 150 | W 5-0 | 59-91 | 5 | 17,741 | Andy Benes | Jason Bere | Andy Benes | Jason Bere | Gregg Olson | 604 | 754 | -150 |
| 1998-09-14 | vs SFN | 151 | W 14-2 | 60-91 | 5 | 39,715 | Brian Anderson | Shawn Estes | Brian Anderson | Shawn Estes | | 618 | 756 | -138 |
| 1998-09-15 | vs SFN | 152 | W 7-6 | 61-91 | 5 | 41,619 | Amaury Telemaco | Kirk Rueter | Gregg Olson | Jose Mesa | | 625 | 762 | -137 |
| 1998-09-16 | vs SFN | 153 | L 5-6 | 61-92 | 5 | 40,547 | Bobby Chouinard | Orel Hershiser | John Johnstone | Gregg Olson | Robb Nen | 630 | 768 | -138 |
| 1998-09-17 | vs ATL | 154 | L 0-1 | 61-93 | 5 | 43,251 | Omar Daal | Denny Neagle | Denny Neagle | Omar Daal | Kerry Ligtenberg | 630 | 769 | -139 |
| 1998-09-18 | vs ATL | 155 | W 5-0 | 62-93 | 5 | 46,434 | Andy Benes | Greg Maddux | Andy Benes | Greg Maddux | | 635 | 769 | -134 |
| 1998-09-19 | vs ATL | 156 | L 0-5 | 62-94 | 5 | 48,405 | Brian Anderson | Tom Glavine | Tom Glavine | Brian Anderson | | 635 | 774 | -139 |
| 1998-09-20 | vs ATL | 157 | L 0-10 | 62-95 | 5 | 44,876 | Amaury Telemaco | Bruce Chen | Bruce Chen | Amaury Telemaco | | 635 | 784 | -149 |
| 1998-09-22 | @ COL | 158 | W 8-6 | 63-95 | 5 | 42,859 | Omar Daal | Jamey Wright | Omar Daal | Jamey Wright | Gregg Olson | 643 | 790 | -147 |
| 1998-09-23 | @ COL | 159 | L 11-14 | 63-96 | 5 | 44,021 | Bobby Chouinard | Pedro Astacio | Dave Wainhouse | Willie Banks | Dave Veres | 654 | 804 | -150 |
| 1998-09-25 | vs SDN | 160 | W 6-3 | 64-96 | 5 | 47,288 | Brian Anderson | Kevin Brown | Gregg Olson | Randy Myers | | 660 | 807 | -147 |
| 1998-09-26 | vs SDN | 161 | W 3-2 | 65-96 | 5 | 48,196 | Amaury Telemaco | Sterling Hitchcock | Amaury Telemaco | Sterling Hitchcock | Gregg Olson | 663 | 809 | -146 |
| 1998-09-27 | vs SDN | 162 | L 2-3 | 65-97 | 5 | 48,390 | Andy Benes | Joey Hamilton | Matt Clement | Aaron Small | Trevor Hoffman | 665 | 812 | -147 |