| Starter | Tm | Tier | Game |
|---|---|---|---|
| Doug Drabek | PIT | 4.94 | 199005210_PIT_HOU |
| Dennis Martinez | WAS | 4.7 | 199005200_WAS_SFN |
| Bryn Smith | SLN | 3.9 | 199005210_SLN_ATL |
| Roger Clemens | BOS | 3.79 | 199005190_MIN_BOS |
| Ted Higuera | MIL | 3.76 | 199005210_SEA_MIL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Clancy | HOU | -4.14 | 199005190_CHN_HOU |
| Walt Terrell | PIT | -3 | 199005190_PIT_ATL |
| Andy Hawkins | NYA | -2.53 | 199005210_CHA_NYA |
| Todd Stottlemyre | TOR | -2.25 | 199005210_OAK_TOR |
| Storm Davis | KCA | -2 | 199005200_KCA_NYA |
Based on accumulated WAA for this season up to 1990-05-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.27 | Bob Welch | 65.7 | OAK |
| +005+ | 3.04 | Frank Viola | 59.7 | NYN |
| +006+ | 2.89 | Bud Black | 59 | CLE |
| +008+ | 2.66 | Jack Armstrong | 53.3 | CIN |
| +009+ | 2.4 | Chris Bosio | 63.3 | MIL |
| +010+ | 2.3 | Dave Stewart | 59.3 | OAK |
| +013+ | 2.11 | Teddy Higuera | 46.3 | MIL |
| +014+ | 1.96 | Chuck Finley | 47.3 | ANA |
| +018+ | 1.88 | Dennis Cook | 53 | PHI |
| +020+ | 1.85 | Tom Glavine | 56.3 | ATL |
| +022+ | 1.77 | Doug Drabek | 52 | PIT |
| +023+ | 1.76 | Ed Whitson | 54 | SDN |
| +024+ | 1.74 | Mark Gardner | 40.3 | WAS |
| +030+ | 1.64 | Dennis Martinez | 65 | WAS |
| +035+ | 1.54 | Mike Witt | 26.3 | TOT |
| +036+ | 1.5 | Neal Heaton | 44.3 | PIT |
| +039+ | 1.43 | Bill Wegman | 20.3 | MIL |
| +043+ | 1.39 | Dan Petry | 45.7 | DET |
| +046+ | 1.35 | Bob Walk | 40.3 | PIT |
| +053+ | 1.26 | Kevin Tapani | 48.3 | MIN |
| XXXXX | 1.22 | Les Lancaster | 34 | CHN |
| XXXXX | 1.17 | Roger Clemens | 64 | BOS |
| XXXXX | 1.13 | Eric King | 41 | CHA |
| XXXXX | 1.11 | Mark Knudson | 37.7 | MIL |
| XXXXX | 1.06 | Willie Blair | 18.7 | TOR |
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