| Starter | Tm | Tier | Game |
|---|---|---|---|
| Joe Magrane | SLN | 4.37 | 199004240_SLN_LAN |
| Chris Bosio | MIL | 3.07 | 199004240_KCA_MIL |
| Mark Langston | ANA | 2.98 | 199004240_ANA_BOS |
| Greg Maddux | CHN | 2.65 | 199004240_CHN_SDN |
| Doug Drabek | PIT | 2.6 | 199004240_PIT_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Dotson | KCA | -2.93 | 199004240_KCA_MIL |
| Jack Morris | DET | -2.74 | 199004220_DET_BAL |
| Tom Glavine | ATL | -2.4 | 199004220_ATL_CIN |
| Pete Harnisch | BAL | -1.43 | 199004230_KCA_BAL |
| Kevin Gross | WAS | -0.99 | 199004240_WAS_HOU |
Based on accumulated WAA for this season up to 1990-04-24.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 1.83 | Teddy Higuera | 20.3 | MIL |
| +003+ | 1.65 | Dennis Cook | 20.3 | PHI |
| +004+ | 1.51 | Mike Morgan | 23.7 | LAN |
| +005+ | 1.5 | Chris Bosio | 26 | MIL |
| +007+ | 1.38 | Chuck Finley | 20.7 | ANA |
| +008+ | 1.31 | Kevin Tapani | 19 | MIN |
| +011+ | 1.26 | Jack Armstrong | 19 | CIN |
| +012+ | 1.26 | John Tudor | 21 | SLN |
| XXXXX | 1.2 | Dave Stewart | 26.3 | OAK |
| XXXXX | 1.11 | Frank Viola | 22.3 | NYN |
| XXXXX | 1.08 | John Dopson | 12 | BOS |
| XXXXX | 1.04 | Zane Smith | 21 | WAS |
| XXXXX | 1.03 | Pascual Perez | 11 | NYA |
| XXXXX | 0.97 | Bob Welch | 18.7 | OAK |
| XXXXX | 0.91 | Dave Stieb | 17 | TOR |
| XXXXX | 0.88 | Tom Gordon | 12 | KCA |
| XXXXX | 0.88 | Neal Heaton | 18.7 | PIT |
| XXXXX | 0.88 | Ramon Martinez | 19 | LAN |
| XXXXX | 0.86 | David West | 18.7 | MIN |
| XXXXX | 0.86 | Tim Leary | 13.7 | NYA |
| XXXXX | 0.83 | Kirk McCaskill | 12 | ANA |
| XXXXX | 0.82 | Atlee Hammaker | 16 | SFN |
| XXXXX | 0.81 | Mark Langston | 19 | ANA |
| XXXXX | 0.77 | Doug Drabek | 24.3 | PIT |
| XXXXX | 0.76 | Mike LaCoss | 20 | SFN |
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