| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ted Higuera | MIL | 3.16 | 199004210_BOS_MIL |
| Frank Viola | NYN | 3.05 | 199004210_WAS_NYN |
| John Tudor | SLN | 2.68 | 199004230_PIT_SLN |
| Mark Gubicza | KCA | 2.48 | 199004210_KCA_TOR |
| Dave Stieb | TOR | 1.24 | 199004210_KCA_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Clancy | HOU | -3.61 | 199004210_HOU_LAN |
| Oil Can Boyd | WAS | -3.01 | 199004210_WAS_NYN |
| Jack Morris | DET | -2.74 | 199004220_DET_BAL |
| Tom Glavine | ATL | -2.4 | 199004220_ATL_CIN |
| Pete Harnisch | BAL | -1.43 | 199004230_KCA_BAL |
Based on accumulated WAA for this season up to 1990-04-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 1.83 | Teddy Higuera | 20.3 | MIL |
| +003+ | 1.65 | Dennis Cook | 20.3 | PHI |
| +004+ | 1.5 | Chris Bosio | 19 | MIL |
| +006+ | 1.36 | Chuck Finley | 20.7 | ANA |
| +007+ | 1.31 | Kevin Tapani | 19 | MIN |
| XXXXX | 1.24 | Jack Armstrong | 19 | CIN |
| XXXXX | 1.24 | John Tudor | 21 | SLN |
| XXXXX | 1.1 | Frank Viola | 22.3 | NYN |
| XXXXX | 1.08 | John Dopson | 12 | BOS |
| XXXXX | 1.04 | Zane Smith | 21 | WAS |
| XXXXX | 1.04 | Pascual Perez | 11 | NYA |
| XXXXX | 0.96 | Bob Welch | 18.7 | OAK |
| XXXXX | 0.91 | Dave Stieb | 17 | TOR |
| XXXXX | 0.88 | Ramon Martinez | 19 | LAN |
| XXXXX | 0.88 | Neal Heaton | 18.7 | PIT |
| XXXXX | 0.87 | Tom Gordon | 12 | KCA |
| XXXXX | 0.87 | Tim Leary | 13.7 | NYA |
| XXXXX | 0.86 | David West | 18.7 | MIN |
| XXXXX | 0.82 | Atlee Hammaker | 16 | SFN |
| XXXXX | 0.82 | Kirk McCaskill | 12 | ANA |
| XXXXX | 0.81 | Dave Stewart | 19.3 | OAK |
| XXXXX | 0.77 | Mike LaCoss | 20 | SFN |
| XXXXX | 0.75 | Dan Petry | 13 | DET |
| XXXXX | 0.74 | Dennis Martinez | 20 | WAS |
| XXXXX | 0.7 | Mike Morgan | 14.7 | LAN |
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