| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 5.2 | 199005290_BOS_TEX |
| Dave Stewart | OAK | 4.11 | 199005290_TOR_OAK |
| Chris Bosio | MIL | 3.92 | 199005300_MIL_SEA |
| Mark Langston | ANA | 2.72 | 199005300_CLE_ANA |
| Tim Leary | NYA | 2.57 | 199005280_NYA_CHA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | PIT | -2.68 | 199005300_LAN_PIT |
| Storm Davis | KCA | -1.95 | 199005300_DET_KCA |
| Bruce Ruffin | PHI | -1.91 | 199005300_SDN_PHI |
| Jim Abbott | ANA | -1.62 | 199005280_CLE_ANA |
| Curt Young | OAK | -1.59 | 199005300_TOR_OAK |
Based on accumulated WAA for this season up to 1990-05-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 3.53 | Dave Stewart | 75.3 | OAK |
| +004+ | 3.49 | Bud Black | 74.3 | CLE |
| +007+ | 3.31 | Jack Armstrong | 61.3 | CIN |
| +008+ | 3.29 | Bob Welch | 72.7 | OAK |
| +010+ | 2.72 | Chris Bosio | 80.3 | MIL |
| +012+ | 2.52 | Frank Viola | 63 | NYN |
| +017+ | 2.34 | Roger Clemens | 81 | BOS |
| +020+ | 2.23 | Tom Browning | 75.3 | CIN |
| +021+ | 2.21 | Tim Leary | 67.7 | NYA |
| +022+ | 2.17 | Chuck Finley | 62.3 | ANA |
| +023+ | 2.16 | Dennis Martinez | 73 | WAS |
| +026+ | 2.12 | Dave Stieb | 63 | TOR |
| +027+ | 1.96 | Greg Hibbard | 59.3 | CHA |
| +031+ | 1.89 | Mark Gardner | 51.3 | WAS |
| +033+ | 1.77 | Dennis Cook | 58.7 | PHI |
| +035+ | 1.76 | Doug Drabek | 61 | PIT |
| +041+ | 1.65 | Dan Petry | 59.7 | DET |
| +046+ | 1.61 | Bret Saberhagen | 71.7 | KCA |
| +044+ | 1.61 | John Tudor | 55 | SLN |
| +048+ | 1.57 | Eric King | 55 | CHA |
| +054+ | 1.5 | Sid Fernandez | 56.3 | NYN |
| +062+ | 1.38 | Tom Glavine | 67 | ATL |
| +061+ | 1.38 | Bobby Ojeda | 38.7 | NYN |
| +072+ | 1.33 | Ed Whitson | 65 | SDN |
| +077+ | 1.28 | Neal Heaton | 55.7 | PIT |
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