| Starter | Tm | Tier | Game |
|---|---|---|---|
| Dennis Martinez | WAS | 4.58 | 199005150_WAS_LAN |
| Dave Stewart | OAK | 3.66 | 199005140_OAK_MIN |
| Roger Clemens | BOS | 3.61 | 199005140_BOS_KCA |
| Chris Bosio | MIL | 3.46 | 199005150_ANA_MIL |
| Mark Langston | ANA | 2.79 | 199005150_ANA_MIL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -4.96 | 199005130_TOR_DET |
| Oil Can Boyd | WAS | -3.36 | 199005130_WAS_SDN |
| Storm Davis | KCA | -1.9 | 199005140_BOS_KCA |
| Walt Terrell | PIT | -1.85 | 199005140_PIT_CIN |
| Jay Tibbs | BAL | -1.7 | 199005130_BAL_OAK |
Based on accumulated WAA for this season up to 1990-05-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.51 | Frank Viola | 51.7 | NYN |
| +003+ | 2.77 | Dennis Cook | 49.3 | PHI |
| +004+ | 2.73 | Bob Welch | 51 | OAK |
| +010+ | 2.05 | Bud Black | 50 | CLE |
| +011+ | 2.02 | Ed Whitson | 48 | SDN |
| +013+ | 1.87 | Chuck Finley | 47.3 | ANA |
| +015+ | 1.81 | Jack Armstrong | 44.3 | CIN |
| +017+ | 1.75 | Chris Bosio | 54.3 | MIL |
| +018+ | 1.75 | Teddy Higuera | 33.3 | MIL |
| +022+ | 1.67 | Dave Stewart | 53.3 | OAK |
| +024+ | 1.6 | Dennis Martinez | 58 | WAS |
| +026+ | 1.56 | Doug Drabek | 45.7 | PIT |
| +027+ | 1.53 | Neal Heaton | 38.3 | PIT |
| +028+ | 1.5 | Bryn Smith | 49.7 | SLN |
| +029+ | 1.5 | Mark Gardner | 33.3 | WAS |
| +034+ | 1.41 | Dave Stieb | 43.7 | TOR |
| +037+ | 1.35 | Fernando Valenzuela | 47 | LAN |
| +038+ | 1.35 | Tom Gordon | 29.3 | KCA |
| +041+ | 1.3 | Tom Glavine | 48.3 | ATL |
| +043+ | 1.27 | Greg Maddux | 44 | CHN |
| XXXXX | 1.2 | Eric King | 35 | CHA |
| XXXXX | 1.17 | Dan Petry | 38.7 | DET |
| XXXXX | 1.11 | Scott Sanderson | 42 | OAK |
| XXXXX | 1.11 | Tim Leary | 44.7 | NYA |
| XXXXX | 1.07 | Mike Morgan | 41.7 | LAN |
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