| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 7.17 | 199005180_NYN_SDN |
| Dennis Martinez | WAS | 4.7 | 199005200_WAS_SFN |
| Roger Clemens | BOS | 3.79 | 199005190_MIN_BOS |
| Chris Bosio | MIL | 3.39 | 199005200_OAK_MIL |
| Mark Langston | ANA | 3.29 | 199005200_ANA_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Clancy | HOU | -4.14 | 199005190_CHN_HOU |
| Walt Terrell | PIT | -3 | 199005190_PIT_ATL |
| Oil Can Boyd | WAS | -2.12 | 199005180_WAS_SFN |
| Storm Davis | KCA | -2 | 199005200_KCA_NYA |
| Bruce Ruffin | PHI | -1.81 | 199005180_PHI_LAN |
Based on accumulated WAA for this season up to 1990-05-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 3.02 | Frank Viola | 59.7 | NYN |
| +005+ | 2.87 | Bud Black | 59 | CLE |
| +006+ | 2.78 | Bob Welch | 58 | OAK |
| +008+ | 2.63 | Jack Armstrong | 53.3 | CIN |
| +009+ | 2.37 | Chris Bosio | 63.3 | MIL |
| +011+ | 2.27 | Dave Stewart | 59.3 | OAK |
| +014+ | 1.94 | Chuck Finley | 47.3 | ANA |
| +017+ | 1.86 | Dennis Cook | 53 | PHI |
| +018+ | 1.83 | Tom Glavine | 56.3 | ATL |
| +022+ | 1.74 | Ed Whitson | 54 | SDN |
| +023+ | 1.72 | Mark Gardner | 40.3 | WAS |
| +027+ | 1.62 | Dennis Martinez | 65 | WAS |
| +032+ | 1.55 | Teddy Higuera | 40.3 | MIL |
| +034+ | 1.53 | Mike Witt | 26.3 | TOT |
| +035+ | 1.51 | Bryn Smith | 56.3 | SLN |
| +036+ | 1.5 | Neal Heaton | 44.3 | PIT |
| +038+ | 1.46 | Mike Morgan | 50.7 | LAN |
| +040+ | 1.42 | Bill Wegman | 20.3 | MIL |
| +042+ | 1.38 | Dan Petry | 45.7 | DET |
| +045+ | 1.34 | Bob Walk | 40.3 | PIT |
| XXXXX | 1.25 | Tom Gordon | 35.3 | KCA |
| XXXXX | 1.24 | Kevin Tapani | 48.3 | MIN |
| XXXXX | 1.2 | Les Lancaster | 34 | CHN |
| XXXXX | 1.15 | Roger Clemens | 64 | BOS |
| XXXXX | 1.11 | Eric King | 41 | CHA |
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