| Starter | Tm | Tier | Game |
|---|---|---|---|
| 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 |
| Doug Drabek | PIT | 3.19 | 199004290_PIT_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Dotson | KCA | -3.47 | 199004290_TEX_KCA |
| Oil Can Boyd | WAS | -3.27 | 199004280_WAS_CIN |
| Todd Stottlemyre | TOR | -2.05 | 199004300_TOR_CLE |
| Terry Mulholland | PHI | -1.74 | 199004280_PHI_ATL |
| Tom Glavine | ATL | -1.64 | 199004280_PHI_ATL |
Based on accumulated WAA for this season up to 1990-04-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.05 | Dennis Cook | 27.3 | PHI |
| +003+ | 2.03 | Bob Welch | 34 | OAK |
| +004+ | 1.87 | John Tudor | 28 | SLN |
| +006+ | 1.82 | Dave Stewart | 34 | OAK |
| +005+ | 1.82 | Chris Bosio | 32.3 | MIL |
| +008+ | 1.79 | Chuck Finley | 28 | ANA |
| +011+ | 1.56 | Kirk McCaskill | 25.3 | ANA |
| +012+ | 1.53 | Frank Viola | 27.3 | NYN |
| +015+ | 1.43 | Zane Smith | 28 | WAS |
| +017+ | 1.39 | Jack Armstrong | 25.7 | CIN |
| +018+ | 1.37 | Mike Morgan | 29.7 | LAN |
| +020+ | 1.3 | Pete Smith | 28.3 | ATL |
| +021+ | 1.29 | Ed Whitson | 24 | SDN |
| +023+ | 1.27 | Jim Deshaies | 31.7 | HOU |
| XXXXX | 1.21 | Dennis Martinez | 35 | WAS |
| XXXXX | 1.2 | Greg Maddux | 27.7 | CHN |
| XXXXX | 1.01 | Nolan Ryan | 28 | TEX |
| XXXXX | 1.01 | Ramon Martinez | 28 | LAN |
| XXXXX | 0.99 | Doug Drabek | 30.3 | PIT |
| XXXXX | 0.96 | Mark Knudson | 20.3 | MIL |
| XXXXX | 0.94 | Mike LaCoss | 27.7 | SFN |
| XXXXX | 0.9 | Mark Langston | 25 | ANA |
| XXXXX | 0.9 | Tom Gordon | 17 | KCA |
| XXXXX | 0.83 | Atlee Hammaker | 24 | SFN |
| XXXXX | 0.82 | Tom Filer | 14 | MIL |
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