| 1998 American League Pitching Leaders |
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| Earned Run Average (min 162 IP) | Won-Lost Percentage (min 13 decisions) | Opposition Average (min 600 batters faced) | |||
| CLEMENS, ROGER (BAA) | 1.56 | CLEMENS, ROGER (BAA) | .893 (25-3) | CLEMENS, ROGER (BAA) | .194 |
| CONE, DAVID (BAA) | 3.01 | GORDON, TOM (ANA) | .760 (19-6) | JOHNSON, RANDY (TOA) | .202 |
| JOHNSON, RANDY (TOA) | 3.03 | MCELROY, CHUCK (NYA) | .750 (12-4) | CONE, DAVID (BAA) | .207 |
| GORDON, TOM (ANA) | 3.51 | THOMPSON, JUSTIN (ANA) | .724 (21-8) | MUSSINA, MIKE (TBA) | .244 |
| APPIER, KEVIN (ANA) | 3.55 | CONE, DAVID (BAA) | .714 (20-8) | RADKE, BRAD (CLA) | .245 |
| MUSSINA, MIKE (TBA) | 3.63 | DICKSON, JASON (TEA) | .692 (18-8) | OLIVER, DARREN (TEA) | .249 |
| RADKE, BRAD (CLA) | 3.68 | JOHNSON, RANDY (TOA) | .645 (20-11) | BALDWIN, JAMES (TBA) | .251 |
| OLIVER, DARREN (TEA) | 3.76 | SWINDELL, GREG (TOA) | .643 (9-5) | FASSERO, JEFF (TEA) | .252 |
| THOMPSON, JUSTIN (ANA) | 3.89 | APPIER, KEVIN (ANA) | .633 (19-11) | HENTGEN, PAT (TBA) | .253 |
| HENTGEN, PAT (TBA) | 4.02 | KEY, JIMMY (NYA) | .625 (15-9) | BLAIR, WILLIE (BAA) | .253 |
| Wins | Losses | Saves | |||
| CLEMENS, ROGER (BAA) | 25 | WATSON, ALLEN (BOA) | 22 | JONES, DOUG (BAA) | 49 |
| THOMPSON, JUSTIN (ANA) | 21 | HERSHISER, OREL (KCR) | 22 | KARCHNER, MATT (ANA) | 39 |
| JOHNSON, RANDY (TOA) | 20 | ROSADO, JOSE (OAA) | 19 | MESA, JOSE (TEA) | 38 |
| CONE, DAVID (BAA) | 20 | JUDEN, JEFF (BOA) | 18 | WETTELAND, JOHN (NYA) | 35 |
| 2 TIED WITH | 19 | 4 TIED WITH | 17 | PERCIVAL, TROY (KCR) | 34 |
| Strikeouts | Walks | Home Runs Allowed | |||
| JOHNSON, RANDY (TOA) | 409 | WATSON, ALLEN (BOA) | 115 | WAKEFIELD, TIM (SEA) | 48 |
| MUSSINA, MIKE (TBA) | 289 | OLIVARES, OMAR (ANA) | 111 | MUSSINA, MIKE (TBA) | 44 |
| CLEMENS, ROGER (BAA) | 288 | CONE, DAVID (BAA) | 110 | SPRINGER, DENNIS (BOA) | 41 |
| CONE, DAVID (BAA) | 262 | JUDEN, JEFF (BOA) | 105 | D'AMICO, JEFF (TEA) | 41 |
| WAKEFIELD, TIM (SEA) | 204 | APPIER, KEVIN (ANA) | 105 | 3 TIED WITH | 39 |