| 1998-03-31 | @ HOU | 1 | W 9-4 | 1-0 | 3 | 43,776 | Shawn Estes | Shane Reynolds | John Johnstone | C.J. Nitkowski | | 9 | 4 | 5 |
| 1998-04-01 | @ HOU | 2 | L 6-7 | 1-1 | 3 | 13,719 | Orel Hershiser | Mike Hampton | Trever Miller | Julian Tavarez | Billy Wagner | 15 | 11 | 4 |
| 1998-04-02 | @ HOU | 3 | W 9-2 | 2-1 | 3 | 15,040 | Kirk Rueter | John Halama | Kirk Rueter | John Halama | | 24 | 13 | 11 |
| 1998-04-03 | @ ARI | 4 | W 8-3 | 3-1 | 3 | 45,590 | Mark Gardner | Jeff Suppan | Mark Gardner | Jeff Suppan | | 32 | 16 | 16 |
| 1998-04-04 | @ ARI | 5 | W 5-3 | 4-1 | 2 | 47,047 | Danny Darwin | Joel Adamson | Danny Darwin | Gregg Olson | Robb Nen | 37 | 19 | 18 |
| 1998-04-05 | @ ARI | 6 | L 2-3 | 4-2 | 3 | 47,593 | Shawn Estes | Andy Benes | Andy Benes | Shawn Estes | Felix Rodriguez | 39 | 22 | 17 |
| 1998-04-07 | vs HOU | 7 | W 5-4 | 5-2 | 2 | 55,370 | Orel Hershiser | John Halama | Robb Nen | Billy Wagner | | 44 | 26 | 18 |
| 1998-04-08 | vs HOU | 8 | L 3-6 | 5-3 | 2 | 10,021 | Kirk Rueter | Jose Lima | Jose Lima | Kirk Rueter | Billy Wagner | 47 | 32 | 15 |
| 1998-04-09 | vs HOU | 9 | L 1-3 | 5-4 | 2 | 10,153 | Mark Gardner | Sean Bergman | Sean Bergman | Mark Gardner | C.J. Nitkowski | 48 | 35 | 13 |
| 1998-04-10 | vs SLN | 10 | W 5-3 | 6-4 | 2 | 15,556 | Danny Darwin | Todd Stottlemyre | Julian Tavarez | John Frascatore | Robb Nen | 53 | 38 | 15 |
| 1998-04-11 | vs SLN | 11 | L 2-7 | 6-5 | 2 | 23,795 | Shawn Estes | Matt Morris | Kent Bottenfield | Shawn Estes | | 55 | 45 | 10 |
| 1998-04-12 | vs SLN | 12 | W 2-1 | 7-5 | 2 | 17,683 | Orel Hershiser | Cliff Politte | Robb Nen | John Frascatore | | 57 | 46 | 11 |
| 1998-04-13 | vs SLN | 13 | W 8-2 | 8-5 | 2 | 14,426 | Kirk Rueter | Manny Aybar | Kirk Rueter | Manny Aybar | | 65 | 48 | 17 |
| 1998-04-14 | vs SDN | 14 | W 13-7 | 9-5 | 2 | 11,669 | Mark Gardner | Mark Langston | Julian Tavarez | Brian Boehringer | | 78 | 55 | 23 |
| 1998-04-15 | vs SDN | 15 | L 0-1 | 9-6 | 2 | 16,255 | Danny Darwin | Kevin Brown | Kevin Brown | Danny Darwin | | 78 | 56 | 22 |
| 1998-04-17 | @ MIL | 16 | L 2-5 | 9-7 | 2 | 14,524 | Shawn Estes | Jose Mercedes | Jose Mercedes | Shawn Estes | Doug Jones | 80 | 61 | 19 |
| 1998-04-18 | @ MIL | 17 | L 1-3 | 9-8 | 2 | 25,053 | Orel Hershiser | Paul Wagner | Paul Wagner | Orel Hershiser | Doug Jones | 81 | 64 | 17 |
| 1998-04-19 | @ MIL | 18 | L 2-3 | 9-9 | 2 | 30,084 | Kirk Rueter | Scott Karl | Bob Wickman | John Johnstone | | 83 | 67 | 16 |
| 1998-04-21 | @ PIT | 19 | W 6-3 | 10-9 | 2 | 8,976 | Mark Gardner | Jon Lieber | Mark Gardner | Jon Lieber | | 89 | 70 | 19 |
| 1998-04-22 | @ PIT | 20 | L 2-5 | 10-10 | 2 | 11,367 | Danny Darwin | Jose Silva | Jose Silva | Danny Darwin | Rich Loiselle | 91 | 75 | 16 |
| 1998-04-23 | @ PIT | 21 | L 0-7 | 10-11 | 2 | 9,899 | Shawn Estes | Francisco Cordova | Francisco Cordova | Shawn Estes | | 91 | 82 | 9 |
| 1998-04-24 | vs MIL | 22 | L 5-7 | 10-12 | 3 | 14,832 | Orel Hershiser | Scott Karl | Scott Karl | Orel Hershiser | Doug Jones | 96 | 89 | 7 |
| 1998-04-25 | vs MIL | 23 | W 2-1 | 11-12 | 3 | 18,457 | Kirk Rueter | Paul Wagner | Kirk Rueter | Paul Wagner | Robb Nen | 98 | 90 | 8 |
| 1998-04-26 | vs MIL | 24 | W 8-7 | 12-12 | 3 | 31,352 | Mark Gardner | Jeff Juden | Steve Reed | Doug Jones | | 106 | 97 | 9 |
| 1998-04-27 | vs PIT | 25 | W 6-5 | 13-12 | 2 | 10,127 | Danny Darwin | Jose Silva | Robb Nen | Rich Loiselle | | 112 | 102 | 10 |
| 1998-04-28 | vs PIT | 26 | W 2-1 | 14-12 | 2 | 11,551 | Shawn Estes | Francisco Cordova | Shawn Estes | Francisco Cordova | Robb Nen | 114 | 103 | 11 |
| 1998-04-30 | @ ATL | 27 | L 0-6 | 14-13 | 3 | 31,818 | Orel Hershiser | Denny Neagle | Denny Neagle | Orel Hershiser | | 114 | 109 | 5 |
| 1998-05-01 | @ ATL | 28 | L 2-6 | 14-14 | 3 | 35,777 | Kirk Rueter | Greg Maddux | Greg Maddux | Kirk Rueter | | 116 | 115 | 1 |
| 1998-05-02 | @ ATL | 29 | L 3-4 | 14-15 | 3 | 46,597 | Mark Gardner | John Smoltz | Kerry Ligtenberg | Robb Nen | | 119 | 119 | 0 |
| 1998-05-03 | @ ATL | 30 | W 12-8 | 15-15 | 3 | 36,958 | Danny Darwin | Tom Glavine | Danny Darwin | Tom Glavine | | 131 | 127 | 4 |
| 1998-05-04 | @ FLO | 31 | W 8-0 | 16-15 | 3 | 12,806 | Shawn Estes | Andy Larkin | Shawn Estes | Andy Larkin | | 139 | 127 | 12 |
| 1998-05-05 | @ FLO | 32 | W 8-2 | 17-15 | 2 | 12,975 | Orel Hershiser | Brian Meadows | Robb Nen | Vic Darensbourg | | 147 | 129 | 18 |
| 1998-05-06 | @ FLO | 33 | W 10-9 | 18-15 | 2 | 16,189 | Kirk Rueter | Livan Hernandez | Steve Reed | Vic Darensbourg | Robb Nen | 157 | 138 | 19 |
| 1998-05-08 | @ CHN | 34 | L 4-5 | 18-16 | 2 | 22,665 | Mark Gardner | Steve Trachsel | Amaury Telemaco | Julian Tavarez | | 161 | 143 | 18 |
| 1998-05-09 | @ CHN | 35 | W 5-1 | 19-17 | 2 | 0 | Danny Darwin | Kevin Tapani | Danny Darwin | Kevin Tapani | | 166 | 144 | 22 |
| 1998-05-09 | @ CHN | 36 | L 0-6 | 19-17 | 2 | 35,970 | Shawn Estes | Geremi Gonzalez | Geremi Gonzalez | Shawn Estes | | 166 | 150 | 16 |
| 1998-05-10 | @ CHN | 37 | W 3-0 | 20-17 | 2 | 26,710 | Orel Hershiser | Mark Clark | Orel Hershiser | Mark Clark | Robb Nen | 169 | 150 | 19 |
| 1998-05-11 | vs MON | 38 | W 7-2 | 21-17 | 2 | 8,243 | Kirk Rueter | Javier Vazquez | Kirk Rueter | Javier Vazquez | | 176 | 152 | 24 |
| 1998-05-13 | vs MON | 39 | L 5-9 | 21-18 | 2 | 10,244 | Mark Gardner | Carlos Perez | Carlos Perez | Mark Gardner | | 181 | 161 | 20 |
| 1998-05-14 | vs MON | 40 | W 6-1 | 23-18 | 2 | 0 | Shawn Estes | Dustin Hermanson | Shawn Estes | Dustin Hermanson | Julian Tavarez | 187 | 162 | 25 |
| 1998-05-14 | vs MON | 41 | W 2-0 | 23-18 | 2 | 12,055 | Danny Darwin | Trey Moore | Danny Darwin | Trey Moore | Robb Nen | 189 | 162 | 27 |
| 1998-05-15 | vs NYN | 42 | W 3-2 | 24-18 | 2 | 14,678 | Orel Hershiser | Masato Yoshii | Orel Hershiser | Greg McMichael | Robb Nen | 192 | 164 | 28 |
| 1998-05-16 | vs NYN | 43 | L 1-4 | 24-19 | 2 | 30,131 | Kirk Rueter | Rick Reed | Rick Reed | Kirk Rueter | John Franco | 193 | 168 | 25 |
| 1998-05-17 | vs NYN | 44 | W 4-2 | 25-19 | 2 | 24,408 | Mark Gardner | Al Leiter | Mark Gardner | Al Leiter | Robb Nen | 197 | 170 | 27 |
| 1998-05-19 | @ MIL | 45 | L 6-9 | 25-20 | 2 | 13,138 | Shawn Estes | Cal Eldred | Doug Jones | Jim Poole | | 203 | 179 | 24 |
| 1998-05-20 | @ MIL | 46 | W 4-2 | 26-20 | 2 | 15,286 | Orel Hershiser | Steve Woodard | Orel Hershiser | Steve Woodard | Robb Nen | 207 | 181 | 26 |
| 1998-05-21 | @ MIL | 47 | W 8-1 | 27-20 | 2 | 21,641 | Kirk Rueter | Scott Karl | Kirk Rueter | Scott Karl | | 215 | 182 | 33 |
| 1998-05-22 | @ SLN | 48 | L 3-4 | 27-21 | 2 | 47,549 | Mark Gardner | Kent Mercker | Curtis King | Julian Tavarez | | 218 | 186 | 32 |
| 1998-05-23 | @ SLN | 49 | L 10-11 | 27-22 | 2 | 39,333 | Danny Darwin | Manny Aybar | Lance Painter | John Johnstone | Curtis King | 228 | 197 | 31 |
| 1998-05-24 | @ SLN | 50 | W 9-6 | 28-22 | 2 | 45,864 | Shawn Estes | Mark Petkovsek | Jim Poole | Kent Mercker | Steve Reed | 237 | 203 | 34 |
| 1998-05-25 | @ CIN | 51 | W 3-1 | 29-22 | 2 | 17,980 | Orel Hershiser | Pete Harnisch | Orel Hershiser | Pete Harnisch | Robb Nen | 240 | 204 | 36 |
| 1998-05-26 | @ CIN | 52 | W 5-2 | 30-22 | 2 | 16,096 | Kirk Rueter | Mike Remlinger | Kirk Rueter | Mike Remlinger | Robb Nen | 245 | 206 | 39 |
| 1998-05-27 | @ CIN | 53 | L 5-7 | 30-23 | 2 | 17,742 | Mark Gardner | Eddie Priest | Scott Sullivan | Jim Poole | Jeff Shaw | 250 | 213 | 37 |
| 1998-05-28 | vs ARI | 54 | L 7-8 | 30-24 | 2 | 12,066 | Danny Darwin | Brian Anderson | Brian Anderson | Danny Darwin | Gregg Olson | 257 | 221 | 36 |
| 1998-05-29 | vs ARI | 55 | W 3-1 | 31-24 | 2 | 16,859 | Shawn Estes | Willie Blair | Shawn Estes | Willie Blair | Robb Nen | 260 | 222 | 38 |
| 1998-05-30 | vs ARI | 56 | W 4-1 | 32-24 | 2 | 28,185 | Orel Hershiser | Omar Daal | Orel Hershiser | Omar Daal | Robb Nen | 264 | 223 | 41 |
| 1998-05-31 | vs ARI | 57 | W 7-4 | 33-24 | 2 | 35,800 | Kirk Rueter | Jeff Suppan | Kirk Rueter | Jeff Suppan | | 271 | 227 | 44 |
| 1998-06-01 | vs CIN | 58 | W 16-3 | 34-24 | 2 | 10,986 | Mark Gardner | Eddie Priest | Mark Gardner | Eddie Priest | | 287 | 230 | 57 |
| 1998-06-02 | vs CIN | 59 | W 4-2 | 35-24 | 2 | 10,320 | Danny Darwin | Scott Winchester | Danny Darwin | Scott Winchester | Robb Nen | 291 | 232 | 59 |
| 1998-06-03 | vs CIN | 60 | W 8-5 | 36-24 | 2 | 13,524 | Shawn Estes | Brett Tomko | Shawn Estes | Brett Tomko | Robb Nen | 299 | 237 | 62 |
| 1998-06-05 | @ SLN | 61 | W 3-2 | 37-24 | 2 | 43,239 | Orel Hershiser | Kent Bottenfield | Orel Hershiser | Kent Bottenfield | Robb Nen | 302 | 239 | 63 |
| 1998-06-06 | @ SLN | 62 | W 5-4 | 38-24 | 1 | 47,333 | Kirk Rueter | Todd Stottlemyre | Rich Rodriguez | Sean Lowe | | 307 | 243 | 64 |
| 1998-06-07 | @ SLN | 63 | W 6-5 | 39-24 | 1 | 41,576 | Mark Gardner | Kent Mercker | Mark Gardner | Kent Mercker | Robb Nen | 313 | 248 | 65 |
| 1998-06-08 | vs SEA | 64 | W 4-3 | 40-24 | 1 | 34,166 | Danny Darwin | Randy Johnson | Danny Darwin | Randy Johnson | Rich Rodriguez | 317 | 251 | 66 |
| 1998-06-09 | vs SEA | 65 | W 7-6 | 41-24 | 1 | 24,137 | Shawn Estes | Ken Cloude | John Johnstone | Ken Cloude | Robb Nen | 324 | 257 | 67 |
| 1998-06-10 | vs SEA | 66 | L 1-4 | 41-25 | 2 | 23,590 | Orel Hershiser | Bill Swift | Bill Swift | Orel Hershiser | Heathcliff Slocumb | 325 | 261 | 64 |
| 1998-06-12 | @ SDN | 67 | L 3-10 | 41-26 | 2 | 60,789 | Kirk Rueter | Sterling Hitchcock | Dan Miceli | Steve Reed | | 328 | 271 | 57 |
| 1998-06-13 | @ SDN | 68 | L 2-4 | 41-27 | 2 | 54,390 | Mark Gardner | Joey Hamilton | Joey Hamilton | Mark Gardner | Trevor Hoffman | 330 | 275 | 55 |
| 1998-06-14 | @ SDN | 69 | L 2-3 | 41-28 | 2 | 40,151 | Danny Darwin | Andy Ashby | Andy Ashby | Danny Darwin | Trevor Hoffman | 332 | 278 | 54 |
| 1998-06-15 | vs COL | 70 | L 3-4 | 41-29 | 2 | 16,891 | Shawn Estes | John Thomson | Curt Leskanic | John Johnstone | Jerry DiPoto | 335 | 282 | 53 |
| 1998-06-16 | vs COL | 71 | W 5-3 | 42-29 | 2 | 12,585 | Orel Hershiser | Bobby Jones | Julian Tavarez | Bobby Jones | Robb Nen | 340 | 285 | 55 |
| 1998-06-17 | vs COL | 72 | W 6-3 | 43-29 | 2 | 19,125 | Kirk Rueter | Darryl Kile | Kirk Rueter | Darryl Kile | Robb Nen | 346 | 288 | 58 |
| 1998-06-18 | vs SDN | 73 | L 6-7 | 43-30 | 2 | 16,899 | Mark Gardner | Joey Hamilton | Roberto Ramirez | John Johnstone | Dan Miceli | 352 | 295 | 57 |
| 1998-06-19 | vs SDN | 74 | L 5-9 | 43-31 | 2 | 23,034 | Danny Darwin | Andy Ashby | Andy Ashby | Danny Darwin | | 357 | 304 | 53 |
| 1998-06-20 | vs SDN | 75 | W 5-2 | 44-31 | 2 | 35,782 | Shawn Estes | Mark Langston | Shawn Estes | Mark Langston | Robb Nen | 362 | 306 | 56 |
| 1998-06-21 | vs SDN | 76 | L 1-5 | 44-32 | 2 | 46,506 | Orel Hershiser | Kevin Brown | Kevin Brown | Orel Hershiser | Trevor Hoffman | 363 | 311 | 52 |
| 1998-06-22 | @ OAK | 77 | W 12-8 | 45-32 | 2 | 36,096 | Kirk Rueter | Kenny Rogers | Kirk Rueter | Aaron Small | | 375 | 319 | 56 |
| 1998-06-23 | @ OAK | 78 | W 4-2 | 46-32 | 2 | 45,169 | Mark Gardner | Tom Candiotti | Mark Gardner | Tom Candiotti | Robb Nen | 379 | 321 | 58 |
| 1998-06-24 | vs OAK | 79 | L 6-7 | 46-33 | 2 | 18,142 | Danny Darwin | Blake Stein | Mike Mohler | Jim Poole | Billy Taylor | 385 | 328 | 57 |
| 1998-06-25 | vs OAK | 80 | L 2-5 | 46-34 | 2 | 23,069 | Shawn Estes | Jimmy Haynes | Jimmy Haynes | Shawn Estes | Billy Taylor | 387 | 333 | 54 |
| 1998-06-26 | vs TEX | 81 | L 3-7 | 46-35 | 2 | 18,180 | Orel Hershiser | Darren Oliver | Darren Oliver | Orel Hershiser | John Wetteland | 390 | 340 | 50 |
| 1998-06-27 | vs TEX | 82 | W 6-5 | 47-35 | 2 | 28,753 | Kirk Rueter | John Burkett | Robb Nen | Danny Patterson | | 396 | 345 | 51 |
| 1998-06-28 | vs TEX | 83 | W 7-0 | 48-35 | 2 | 36,664 | Mark Gardner | Aaron Sele | Mark Gardner | Aaron Sele | | 403 | 345 | 58 |
| 1998-06-30 | @ ANA | 84 | L 3-4 | 48-36 | 2 | 25,629 | Shawn Estes | Chuck Finley | Chuck Finley | Shawn Estes | Troy Percival | 406 | 349 | 57 |
| 1998-07-01 | @ ANA | 85 | W 6-3 | 49-36 | 2 | 24,299 | Danny Darwin | Steve Sparks | Robb Nen | Greg Cadaret | | 412 | 352 | 60 |
| 1998-07-02 | @ ANA | 86 | W 7-4 | 50-36 | 2 | 33,272 | Kirk Rueter | Jason Dickson | Kirk Rueter | Jason Dickson | | 419 | 356 | 63 |
| 1998-07-03 | vs LAN | 87 | W 6-3 | 51-36 | 2 | 56,788 | Orel Hershiser | Ismael Valdez | Orel Hershiser | Ismael Valdez | Robb Nen | 425 | 359 | 66 |
| 1998-07-04 | vs LAN | 88 | L 5-9 | 51-37 | 2 | 41,012 | Mark Gardner | Dave Mlicki | Dave Mlicki | Mark Gardner | | 430 | 368 | 62 |
| 1998-07-05 | vs LAN | 89 | W 3-0 | 52-37 | 2 | 40,111 | Shawn Estes | Darren Dreifort | Shawn Estes | Darren Dreifort | Robb Nen | 433 | 368 | 65 |
| 1998-07-10 | @ COL | 90 | L 2-11 | 52-38 | 2 | 48,174 | Shawn Estes | Darryl Kile | Darryl Kile | Shawn Estes | | 435 | 379 | 56 |
| 1998-07-11 | @ COL | 91 | L 4-5 | 52-39 | 2 | 48,262 | Orel Hershiser | Jamey Wright | Chuck McElroy | Orel Hershiser | Mike Munoz | 439 | 384 | 55 |
| 1998-07-12 | @ COL | 92 | L 3-5 | 52-40 | 2 | 48,334 | Kirk Rueter | Pedro Astacio | Pedro Astacio | Kirk Rueter | Mike Munoz | 442 | 389 | 53 |
| 1998-07-13 | @ LAN | 93 | L 5-7 | 52-41 | 2 | 36,409 | Danny Darwin | Dave Mlicki | Dave Mlicki | Danny Darwin | Jeff Shaw | 447 | 396 | 51 |
| 1998-07-14 | @ LAN | 94 | L 1-2 | 52-42 | 2 | 41,513 | Mark Gardner | Chan Ho Park | Scott Radinsky | John Johnstone | | 448 | 398 | 50 |
| 1998-07-15 | @ LAN | 95 | W 5-3 | 53-42 | 2 | 34,596 | Orel Hershiser | Darren Dreifort | Orel Hershiser | Darren Dreifort | Robb Nen | 453 | 401 | 52 |
| 1998-07-17 | @ HOU | 96 | L 7-10 | 53-43 | 2 | 40,709 | Kirk Rueter | Jose Lima | Jose Lima | Kirk Rueter | | 460 | 411 | 49 |
| 1998-07-18 | @ HOU | 97 | L 2-7 | 53-44 | 2 | 35,257 | Danny Darwin | Sean Bergman | Sean Bergman | Danny Darwin | | 462 | 418 | 44 |
| 1998-07-19 | @ HOU | 98 | L 3-4 | 53-45 | 2 | 32,900 | Mark Gardner | Pete Schourek | Doug Henry | Robb Nen | | 465 | 422 | 43 |
| 1998-07-20 | vs ARI | 99 | W 5-3 | 54-45 | 2 | 15,550 | Russ Ortiz | Omar Daal | Rich Rodriguez | Bobby Chouinard | Robb Nen | 470 | 425 | 45 |
| 1998-07-21 | vs ARI | 100 | L 3-5 | 54-46 | 2 | 12,433 | Orel Hershiser | Andy Benes | Andy Benes | Orel Hershiser | Gregg Olson | 473 | 430 | 43 |
| 1998-07-22 | vs SLN | 101 | L 2-3 | 54-47 | 2 | 40,147 | Kirk Rueter | Bobby Witt | Bobby Witt | Kirk Rueter | Rich Croushore | 475 | 433 | 42 |
| 1998-07-23 | vs SLN | 102 | L 1-8 | 54-48 | 2 | 46,393 | Danny Darwin | Kent Bottenfield | Kent Bottenfield | Danny Darwin | | 476 | 441 | 35 |
| 1998-07-24 | vs CIN | 103 | W 12-2 | 55-48 | 2 | 16,931 | Mark Gardner | Scott Winchester | Mark Gardner | Scott Winchester | | 488 | 443 | 45 |
| 1998-07-25 | vs CIN | 104 | L 8-9 | 55-49 | 2 | 50,054 | Russ Ortiz | Steve Parris | Stan Belinda | Russ Ortiz | Danny Graves | 496 | 452 | 44 |
| 1998-07-26 | vs CIN | 105 | W 2-1 | 56-49 | 2 | 34,638 | Orel Hershiser | Brett Tomko | Jose Mesa | Stan Belinda | | 498 | 453 | 45 |
| 1998-07-28 | @ MON | 106 | W 7-1 | 57-49 | 2 | 9,543 | Kirk Rueter | Javier Vazquez | Kirk Rueter | Javier Vazquez | | 505 | 454 | 51 |
| 1998-07-29 | @ MON | 107 | L 0-6 | 57-50 | 2 | 8,293 | Danny Darwin | Dustin Hermanson | Dustin Hermanson | Danny Darwin | | 505 | 460 | 45 |
| 1998-07-30 | @ MON | 108 | L 6-12 | 57-51 | 2 | 7,575 | Mark Gardner | Mike Thurman | Mike Thurman | Mark Gardner | Shayne Bennett | 511 | 472 | 39 |
| 1998-07-31 | @ PHI | 109 | W 7-6 | 58-51 | 2 | 21,763 | Russ Ortiz | Curt Schilling | Jose Mesa | Yorkis Perez | Robb Nen | 518 | 478 | 40 |
| 1998-08-01 | @ PHI | 110 | W 8-7 | 59-51 | 2 | 24,452 | Orel Hershiser | Mark Portugal | Robb Nen | Ricky Bottalico | Rich Rodriguez | 526 | 485 | 41 |
| 1998-08-02 | @ PHI | 111 | W 15-3 | 60-51 | 2 | 27,668 | Kirk Rueter | Mike Welch | Kirk Rueter | Mike Welch | | 541 | 488 | 53 |
| 1998-08-03 | @ PHI | 112 | W 6-1 | 61-51 | 2 | 31,080 | Danny Darwin | Carlton Loewer | Danny Darwin | Carlton Loewer | | 547 | 489 | 58 |
| 1998-08-04 | @ NYN | 113 | L 6-7 | 61-52 | 2 | 32,943 | Mark Gardner | Al Leiter | Dennis Cook | Jose Mesa | | 553 | 496 | 57 |
| 1998-08-05 | @ NYN | 114 | W 6-4 | 62-52 | 2 | 35,571 | Russ Ortiz | Bobby Jones | Russ Ortiz | Bobby Jones | Robb Nen | 559 | 500 | 59 |
| 1998-08-06 | @ NYN | 115 | L 8-9 | 62-53 | 2 | 36,920 | Orel Hershiser | Masato Yoshii | Turk Wendell | Robb Nen | | 567 | 509 | 58 |
| 1998-08-07 | vs ATL | 116 | L 0-5 | 62-54 | 2 | 29,676 | Kirk Rueter | Tom Glavine | Tom Glavine | Kirk Rueter | | 567 | 514 | 53 |
| 1998-08-08 | vs ATL | 117 | L 6-14 | 62-55 | 2 | 39,174 | Danny Darwin | Kevin Millwood | Kevin Millwood | Danny Darwin | | 573 | 528 | 45 |
| 1998-08-09 | vs ATL | 118 | L 5-7 | 62-56 | 2 | 43,957 | Mark Gardner | John Smoltz | Dennis Martinez | Jose Mesa | Kerry Ligtenberg | 578 | 535 | 43 |
| 1998-08-10 | vs CHN | 119 | L 5-8 | 62-57 | 2 | 28,866 | Russ Ortiz | Kevin Tapani | Kevin Tapani | Russ Ortiz | Rod Beck | 583 | 543 | 40 |
| 1998-08-11 | vs CHN | 120 | W 8-7 | 63-57 | 2 | 25,065 | Orel Hershiser | Kerry Wood | Jose Mesa | Terry Adams | Robb Nen | 591 | 550 | 41 |
| 1998-08-12 | vs CHN | 121 | L 2-10 | 63-58 | 2 | 25,109 | Kirk Rueter | Steve Trachsel | Steve Trachsel | Kirk Rueter | | 593 | 560 | 33 |
| 1998-08-14 | vs FLO | 122 | W 10-0 | 64-58 | 2 | 18,077 | Mark Gardner | Andy Larkin | Mark Gardner | Andy Larkin | | 603 | 560 | 43 |
| 1998-08-15 | vs FLO | 123 | W 4-3 | 65-58 | 2 | 23,523 | Russ Ortiz | Livan Hernandez | Jose Mesa | Matt Mantei | | 607 | 563 | 44 |
| 1998-08-16 | vs FLO | 124 | W 3-2 | 66-58 | 2 | 28,289 | Orel Hershiser | Jesus Sanchez | Orel Hershiser | Jesus Sanchez | Robb Nen | 610 | 565 | 45 |
| 1998-08-18 | @ ATL | 125 | L 4-8 | 66-59 | 2 | 42,986 | Kirk Rueter | Greg Maddux | Greg Maddux | Kirk Rueter | | 614 | 573 | 41 |
| 1998-08-19 | @ ATL | 126 | W 6-2 | 67-59 | 2 | 44,535 | Mark Gardner | Tom Glavine | Mark Gardner | Tom Glavine | | 620 | 575 | 45 |
| 1998-08-20 | @ CHN | 127 | L 3-7 | 67-60 | 2 | 37,803 | Russ Ortiz | Kevin Tapani | Kevin Tapani | Russ Ortiz | | 623 | 582 | 41 |
| 1998-08-21 | @ CHN | 128 | L 5-6 | 67-61 | 2 | 39,059 | Orel Hershiser | Kerry Wood | Felix Heredia | Robb Nen | | 628 | 588 | 40 |
| 1998-08-22 | @ FLO | 129 | W 5-4 | 68-61 | 2 | 27,121 | Danny Darwin | Jesus Sanchez | Rich Rodriguez | Brian Edmondson | Robb Nen | 633 | 592 | 41 |
| 1998-08-23 | @ FLO | 130 | W 10-5 | 69-61 | 2 | 36,701 | Kirk Rueter | Kirt Ojala | Kirk Rueter | Kirt Ojala | | 643 | 597 | 46 |
| 1998-08-24 | @ FLO | 131 | W 7-4 | 70-61 | 2 | 13,254 | Mark Gardner | Brian Meadows | Rich Rodriguez | Brian Edmondson | Robb Nen | 650 | 601 | 49 |
| 1998-08-25 | vs NYN | 132 | W 7-3 | 71-61 | 2 | 20,916 | Russ Ortiz | Rick Reed | Russ Ortiz | Rick Reed | | 657 | 604 | 53 |
| 1998-08-26 | vs NYN | 133 | L 1-4 | 71-62 | 2 | 18,227 | Orel Hershiser | Hideo Nomo | Hideo Nomo | Orel Hershiser | | 658 | 608 | 50 |
| 1998-08-27 | vs NYN | 134 | W 11-3 | 72-62 | 2 | 17,823 | Danny Darwin | Armando Reynoso | Danny Darwin | Armando Reynoso | | 669 | 611 | 58 |
| 1998-08-28 | vs PHI | 135 | L 3-4 | 72-63 | 2 | 14,317 | Kirk Rueter | Tyler Green | Mark Leiter | Robb Nen | | 672 | 615 | 57 |
| 1998-08-29 | vs PHI | 136 | W 10-3 | 73-63 | 2 | 30,147 | Mark Gardner | Carlton Loewer | Mark Gardner | Carlton Loewer | | 682 | 618 | 64 |
| 1998-08-30 | vs PHI | 137 | L 4-5 | 73-64 | 2 | 36,920 | Russ Ortiz | Curt Schilling | Curt Schilling | Russ Ortiz | | 686 | 623 | 63 |
| 1998-08-31 | vs PHI | 138 | W 6-2 | 74-64 | 2 | 13,092 | Orel Hershiser | Mark Portugal | Jose Mesa | Wayne Gomes | | 692 | 625 | 67 |
| 1998-09-01 | vs MON | 139 | W 9-7 | 75-64 | 2 | 10,160 | Danny Darwin | Miguel Batista | John Johnstone | Steve Kline | Robb Nen | 701 | 632 | 69 |
| 1998-09-02 | vs MON | 140 | W 12-3 | 76-64 | 2 | 10,673 | Kirk Rueter | Javier Vazquez | Kirk Rueter | Javier Vazquez | | 713 | 635 | 78 |
| 1998-09-04 | @ LAN | 141 | L 5-8 | 76-65 | 2 | 35,182 | Shawn Estes | Darren Dreifort | Darren Dreifort | Shawn Estes | Jeff Shaw | 718 | 643 | 75 |
| 1998-09-05 | @ LAN | 142 | L 3-6 | 76-66 | 2 | 35,802 | Orel Hershiser | Chan Ho Park | Chan Ho Park | Orel Hershiser | | 721 | 649 | 72 |
| 1998-09-06 | @ LAN | 143 | W 6-2 | 77-66 | 2 | 39,803 | Mark Gardner | Brian Bohanon | Mark Gardner | Brian Bohanon | | 727 | 651 | 76 |
| 1998-09-07 | @ SDN | 144 | W 5-4 | 78-66 | 2 | 19,393 | Russ Ortiz | Stan Spencer | Julian Tavarez | Randy Myers | Robb Nen | 732 | 655 | 77 |
| 1998-09-08 | @ SDN | 145 | W 5-1 | 79-66 | 2 | 19,362 | Kirk Rueter | Andy Ashby | Kirk Rueter | Andy Ashby | | 737 | 656 | 81 |
| 1998-09-09 | @ SDN | 146 | L 3-8 | 79-67 | 2 | 26,589 | Shawn Estes | Sterling Hitchcock | Sterling Hitchcock | Shawn Estes | Trevor Hoffman | 740 | 664 | 76 |
| 1998-09-11 | vs COL | 147 | L 6-7 | 79-68 | 2 | 34,698 | Orel Hershiser | Jamey Wright | Jim Stoops | Alvin Morman | Jerry DiPoto | 746 | 671 | 75 |
| 1998-09-12 | vs COL | 148 | L 0-1 | 79-69 | 2 | 30,422 | Mark Gardner | Pedro Astacio | Pedro Astacio | Robb Nen | Jerry DiPoto | 746 | 672 | 74 |
| 1998-09-13 | vs COL | 149 | W 4-3 | 80-69 | 2 | 30,278 | Russ Ortiz | John Thomson | John Johnstone | Chuck McElroy | Robb Nen | 750 | 675 | 75 |
| 1998-09-14 | @ ARI | 150 | L 2-14 | 80-70 | 2 | 39,715 | Shawn Estes | Brian Anderson | Brian Anderson | Shawn Estes | | 752 | 689 | 63 |
| 1998-09-15 | @ ARI | 151 | L 6-7 | 80-71 | 2 | 41,619 | Kirk Rueter | Amaury Telemaco | Gregg Olson | Jose Mesa | | 758 | 696 | 62 |
| 1998-09-16 | @ ARI | 152 | W 6-5 | 81-71 | 2 | 40,547 | Orel Hershiser | Bobby Chouinard | John Johnstone | Gregg Olson | Robb Nen | 764 | 701 | 63 |
| 1998-09-18 | vs LAN | 153 | W 4-3 | 82-71 | 2 | 31,452 | Mark Gardner | Dave Mlicki | Julian Tavarez | Scott Radinsky | Robb Nen | 768 | 704 | 64 |
| 1998-09-19 | vs LAN | 154 | W 18-4 | 83-71 | 2 | 41,671 | Russ Ortiz | Ismael Valdez | Russ Ortiz | Ismael Valdez | | 786 | 708 | 78 |
| 1998-09-20 | vs LAN | 155 | L 0-1 | 83-72 | 2 | 40,184 | Shawn Estes | Carlos Perez | Carlos Perez | Shawn Estes | | 786 | 709 | 77 |
| 1998-09-21 | vs PIT | 156 | W 8-1 | 84-72 | 2 | 15,695 | Orel Hershiser | Jose Silva | Orel Hershiser | Jose Silva | | 794 | 710 | 84 |
| 1998-09-22 | vs PIT | 157 | W 14-2 | 85-72 | 2 | 16,228 | Kirk Rueter | Jon Lieber | Kirk Rueter | Jon Lieber | | 808 | 712 | 96 |
| 1998-09-23 | vs PIT | 158 | W 4-1 | 86-72 | 2 | 13,915 | Mark Gardner | Chris Peters | Mark Gardner | Chris Peters | Robb Nen | 812 | 713 | 99 |
| 1998-09-24 | vs PIT | 159 | W 6-2 | 87-72 | 2 | 16,754 | Russ Ortiz | Elmer Dessens | Russ Ortiz | Elmer Dessens | | 818 | 715 | 103 |
| 1998-09-25 | @ COL | 160 | W 8-6 | 88-72 | 2 | 48,147 | Shawn Estes | John Thomson | John Johnstone | Curt Leskanic | Robb Nen | 826 | 721 | 105 |
| 1998-09-26 | @ COL | 161 | W 8-4 | 89-72 | 2 | 47,462 | Orel Hershiser | Darryl Kile | Orel Hershiser | Darryl Kile | | 834 | 725 | 109 |
| 1998-09-27 | @ COL | 162 | L 8-9 | 89-73 | 2 | 48,028 | Kirk Rueter | Jamey Wright | Jerry DiPoto | Robb Nen | | 842 | 734 | 108 |
| 1998-09-28 | @ CHN | 163 | L 3-5 | 89-74 | 2 | 39,556 | Mark Gardner | Steve Trachsel | Steve Trachsel | Mark Gardner | Rod Beck | 845 | 739 | 106 |