| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ted Higuera | MIL | 4.12 | 199005010_MIL_KCA |
| Dennis Martinez | WAS | 4.05 | 199004300_HOU_WAS |
| Joe Magrane | SLN | 3.68 | 199004290_SLN_SFN |
| Mark Langston | ANA | 3.58 | 199004290_ANA_NYA |
| Jim Deshaies | HOU | 3.24 | 199004300_HOU_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Dotson | KCA | -3.47 | 199004290_TEX_KCA |
| Todd Stottlemyre | TOR | -2.05 | 199004300_TOR_CLE |
| Walt Terrell | PIT | -1.96 | 199005010_PIT_LAN |
| Andy Hawkins | NYA | -1.85 | 199005010_OAK_NYA |
| Melido Perez | CHA | -1.79 | 199005010_TEX_CHA |
Based on accumulated WAA for this season up to 1990-05-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 2.03 | Dennis Cook | 27.3 | PHI |
| +003+ | 2.02 | Bob Welch | 34 | OAK |
| +004+ | 1.85 | John Tudor | 28 | SLN |
| +006+ | 1.81 | Chris Bosio | 32.3 | MIL |
| +005+ | 1.81 | Dave Stewart | 34 | OAK |
| +008+ | 1.78 | Chuck Finley | 28 | ANA |
| +007+ | 1.78 | Teddy Higuera | 27.3 | MIL |
| +011+ | 1.56 | Ed Whitson | 32 | SDN |
| +012+ | 1.55 | Kirk McCaskill | 25.3 | ANA |
| +013+ | 1.54 | Frank Viola | 27.3 | NYN |
| +016+ | 1.39 | Jack Armstrong | 25.7 | CIN |
| +017+ | 1.37 | Zane Smith | 28 | WAS |
| +019+ | 1.36 | Mike Morgan | 29.7 | LAN |
| +022+ | 1.28 | Pete Smith | 28.3 | ATL |
| XXXXX | 1.21 | Jim Deshaies | 31.7 | HOU |
| XXXXX | 1.19 | Bryn Smith | 34.7 | SLN |
| XXXXX | 1.19 | Greg Maddux | 27.7 | CHN |
| XXXXX | 1.13 | Dennis Martinez | 35 | WAS |
| XXXXX | 1.01 | Dave Stieb | 30 | TOR |
| XXXXX | 1 | Ramon Martinez | 28 | LAN |
| XXXXX | 1 | Doug Drabek | 30.3 | PIT |
| XXXXX | 0.96 | Mark Knudson | 20.3 | MIL |
| XXXXX | 0.93 | Mike LaCoss | 27.7 | SFN |
| XXXXX | 0.89 | Tom Gordon | 17 | KCA |
| XXXXX | 0.89 | Mark Langston | 25 | ANA |
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