| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Langston | ANA | 3.71 | 199005040_NYA_ANA |
| Dennis Martinez | WAS | 3.71 | 199005050_SFN_WAS |
| John Tudor | SLN | 3.53 | 199005040_CIN_SLN |
| Chris Bosio | MIL | 3.36 | 199005050_MIN_MIL |
| Roger Clemens | BOS | 3.35 | 199005040_BOS_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Oil Can Boyd | WAS | -4.27 | 199005030_ATL_WAS |
| Rich Dotson | KCA | -3.34 | 199005050_CHA_KCA |
| Todd Stottlemyre | TOR | -2.16 | 199005050_DET_TOR |
| Frank Tanana | DET | -1.39 | 199005030_MIN_DET |
| Terry Mulholland | PHI | -1.3 | 199005030_HOU_PHI |
Based on accumulated WAA for this season up to 1990-05-05.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.36 | Frank Viola | 36.3 | NYN |
| +002+ | 2.2 | Mike Morgan | 38.7 | LAN |
| +003+ | 2.1 | Jack Armstrong | 33.3 | CIN |
| +004+ | 2.04 | Dave Stewart | 41 | OAK |
| +006+ | 1.91 | Bob Welch | 42 | OAK |
| +007+ | 1.84 | Dennis Cook | 34.3 | PHI |
| +008+ | 1.81 | Teddy Higuera | 27.3 | MIL |
| +009+ | 1.6 | Ed Whitson | 32 | SDN |
| +010+ | 1.59 | Greg Maddux | 36.7 | CHN |
| +012+ | 1.56 | Chris Bosio | 38.7 | MIL |
| +013+ | 1.53 | John Tudor | 33.3 | SLN |
| +015+ | 1.51 | Bud Black | 34.7 | CLE |
| +020+ | 1.3 | Pete Smith | 28.3 | ATL |
| +022+ | 1.27 | Jim Deshaies | 31.7 | HOU |
| +024+ | 1.25 | Chuck Finley | 31 | ANA |
| XXXXX | 1.24 | Dennis Martinez | 43 | WAS |
| XXXXX | 1.23 | Bryn Smith | 34.7 | SLN |
| XXXXX | 1.21 | Tom Gordon | 23 | KCA |
| XXXXX | 1.06 | Eric King | 29 | CHA |
| XXXXX | 1.04 | Doug Drabek | 30.3 | PIT |
| XXXXX | 1.04 | Dave Stieb | 30 | TOR |
| XXXXX | 1.03 | Erik Hanson | 30 | SEA |
| XXXXX | 0.97 | Mark Knudson | 20.3 | MIL |
| XXXXX | 0.97 | Mike LaCoss | 27.7 | SFN |
| XXXXX | 0.92 | Tim Leary | 28.7 | NYA |
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