| Starter | Tm | Tier | Game |
|---|---|---|---|
| Dennis Martinez | WAS | 3.96 | 199005100_LAN_WAS |
| Mark Langston | ANA | 3.28 | 199005090_BAL_ANA |
| John Tudor | SLN | 3.09 | 199005090_SDN_SLN |
| Chris Bosio | MIL | 2.99 | 199005090_DET_MIL |
| Dave Stewart | OAK | 2.98 | 199005090_NYA_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | PIT | -2.29 | 199005080_SDN_PIT |
| Matt Young | SEA | -1.52 | 199005080_BOS_SEA |
| Todd Stottlemyre | TOR | -1.35 | 199005100_TOR_DET |
| Pete Harnisch | BAL | -1.27 | 199005090_BAL_ANA |
| Storm Davis | KCA | -1.14 | 199005090_KCA_TEX |
Based on accumulated WAA for this season up to 1990-05-10.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.71 | Frank Viola | 42.7 | NYN |
| +002+ | 2.56 | Dave Stewart | 49.3 | OAK |
| +004+ | 2.28 | Mike Morgan | 38.7 | LAN |
| +005+ | 2.19 | Dennis Cook | 40.3 | PHI |
| +006+ | 2.09 | Chuck Finley | 40 | ANA |
| +008+ | 1.96 | Jack Armstrong | 38.3 | CIN |
| +009+ | 1.93 | Bob Welch | 42 | OAK |
| +010+ | 1.92 | Bud Black | 43.7 | CLE |
| +011+ | 1.9 | Chris Bosio | 46.7 | MIL |
| +012+ | 1.84 | Ed Whitson | 41 | SDN |
| +015+ | 1.75 | Teddy Higuera | 33.3 | MIL |
| +017+ | 1.66 | Dennis Martinez | 52 | WAS |
| +020+ | 1.58 | Mark Gardner | 27.3 | WAS |
| +023+ | 1.56 | Dave Stieb | 37.7 | TOR |
| +030+ | 1.48 | Doug Drabek | 37.3 | PIT |
| +033+ | 1.35 | Tom Gordon | 29.3 | KCA |
| +037+ | 1.25 | Bryn Smith | 41.7 | SLN |
| XXXXX | 1.19 | Jim Deshaies | 37.7 | HOU |
| XXXXX | 1.15 | Bill Sampen | 15.3 | WAS |
| XXXXX | 1.12 | Tom Glavine | 41.3 | ATL |
| XXXXX | 1.1 | Eric King | 29 | CHA |
| XXXXX | 1.09 | Dan Petry | 32.7 | DET |
| XXXXX | 1 | Scott Sanderson | 36 | OAK |
| XXXXX | 0.91 | Pete Smith | 32.3 | ATL |
| XXXXX | 0.85 | Tom Browning | 44.7 | CIN |
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