| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Langston | ANA | 3.71 | 199005040_NYA_ANA |
| John Tudor | SLN | 3.53 | 199005040_CIN_SLN |
| Roger Clemens | BOS | 3.35 | 199005040_BOS_OAK |
| Frank Viola | NYN | 3.32 | 199005020_CIN_NYN |
| Dave Stewart | OAK | 2.54 | 199005040_BOS_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Oil Can Boyd | WAS | -4.27 | 199005030_ATL_WAS |
| Jack Morris | DET | -3.38 | 199005020_MIN_DET |
| Jim Clancy | HOU | -2.51 | 199005020_HOU_PHI |
| Mike Flanagan | TOR | -1.45 | 199005040_DET_TOR |
| Terry Mulholland | PHI | -1.3 | 199005030_HOU_PHI |
Based on accumulated WAA for this season up to 1990-05-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.34 | Frank Viola | 36.3 | NYN |
| +002+ | 2.09 | Jack Armstrong | 33.3 | CIN |
| +003+ | 2.05 | Bob Welch | 34 | OAK |
| +004+ | 2.02 | Dave Stewart | 41 | OAK |
| +007+ | 1.83 | Chris Bosio | 32.3 | MIL |
| +006+ | 1.83 | Dennis Cook | 34.3 | PHI |
| +008+ | 1.8 | Teddy Higuera | 27.3 | MIL |
| +010+ | 1.58 | Ed Whitson | 32 | SDN |
| +011+ | 1.58 | Kirk McCaskill | 25.3 | ANA |
| +013+ | 1.52 | John Tudor | 33.3 | SLN |
| +014+ | 1.5 | Bud Black | 34.7 | CLE |
| +016+ | 1.39 | Mike Morgan | 29.7 | LAN |
| +021+ | 1.29 | Pete Smith | 28.3 | ATL |
| +023+ | 1.26 | Jim Deshaies | 31.7 | HOU |
| XXXXX | 1.24 | Chuck Finley | 31 | ANA |
| XXXXX | 1.22 | Bryn Smith | 34.7 | SLN |
| XXXXX | 1.2 | Tom Gordon | 23 | KCA |
| XXXXX | 1.2 | Greg Maddux | 27.7 | CHN |
| XXXXX | 1.16 | Dennis Martinez | 35 | WAS |
| XXXXX | 1.03 | Dave Stieb | 30 | TOR |
| XXXXX | 1.03 | Doug Drabek | 30.3 | PIT |
| XXXXX | 1.02 | Erik Hanson | 30 | SEA |
| XXXXX | 0.97 | Mark Knudson | 20.3 | MIL |
| XXXXX | 0.96 | Mike LaCoss | 27.7 | SFN |
| XXXXX | 0.91 | Tim Leary | 28.7 | NYA |
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