| 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 |
| John Tudor | SLN | 2.33 | 199005290_SLN_HOU |
| 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 |
| Curt Young | OAK | -1.59 | 199005300_TOR_OAK |
| Frank Tanana | DET | -1.48 | 199005290_DET_KCA |
Based on accumulated WAA for this season up to 1990-05-31.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.81 | Jack Armstrong | 69.7 | CIN |
| +004+ | 3.51 | Dave Stewart | 75.3 | OAK |
| +005+ | 3.47 | Bud Black | 74.3 | CLE |
| +009+ | 3.14 | Bob Welch | 78.3 | OAK |
| +010+ | 2.7 | Chris Bosio | 80.3 | MIL |
| +012+ | 2.51 | Frank Viola | 63 | NYN |
| +017+ | 2.31 | Roger Clemens | 81 | BOS |
| +020+ | 2.21 | Tom Browning | 75.3 | CIN |
| +021+ | 2.19 | Tim Leary | 67.7 | NYA |
| +022+ | 2.16 | Chuck Finley | 62.3 | ANA |
| +023+ | 2.14 | Dennis Martinez | 73 | WAS |
| +026+ | 2.1 | Dave Stieb | 63 | TOR |
| +028+ | 1.94 | Greg Hibbard | 59.3 | CHA |
| +032+ | 1.88 | Mark Gardner | 51.3 | WAS |
| +035+ | 1.75 | Dennis Cook | 58.7 | PHI |
| +036+ | 1.74 | Doug Drabek | 61 | PIT |
| +045+ | 1.63 | Dan Petry | 59.7 | DET |
| +047+ | 1.6 | John Tudor | 55 | SLN |
| +048+ | 1.59 | Bret Saberhagen | 71.7 | KCA |
| +051+ | 1.56 | Eric King | 55 | CHA |
| +056+ | 1.49 | Sid Fernandez | 56.3 | NYN |
| +063+ | 1.37 | Tom Glavine | 67 | ATL |
| +064+ | 1.37 | Bobby Ojeda | 38.7 | NYN |
| +070+ | 1.34 | Mike Morgan | 70 | LAN |
| +073+ | 1.31 | Ed Whitson | 65 | SDN |
_