| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 4.88 | 199005070_HOU_NYN |
| 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 |
|---|---|---|---|
| Jack Morris | DET | -4.72 | 199005070_DET_MIL |
| Jim Clancy | HOU | -3.83 | 199005070_HOU_NYN |
| Walt Terrell | PIT | -2.29 | 199005080_SDN_PIT |
| Jay Tibbs | BAL | -1.54 | 199005070_BAL_ANA |
| Matt Young | SEA | -1.52 | 199005080_BOS_SEA |
Based on accumulated WAA for this season up to 1990-05-09.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.7 | Frank Viola | 42.7 | NYN |
| +002+ | 2.55 | Dave Stewart | 49.3 | OAK |
| +003+ | 2.25 | Mike Morgan | 38.7 | LAN |
| +004+ | 2.18 | Dennis Cook | 40.3 | PHI |
| +006+ | 2.06 | Chuck Finley | 40 | ANA |
| +007+ | 1.95 | Jack Armstrong | 38.3 | CIN |
| +009+ | 1.92 | Bob Welch | 42 | OAK |
| +010+ | 1.89 | Bud Black | 43.7 | CLE |
| +011+ | 1.89 | Chris Bosio | 46.7 | MIL |
| +012+ | 1.83 | Ed Whitson | 41 | SDN |
| +014+ | 1.74 | Teddy Higuera | 33.3 | MIL |
| +018+ | 1.57 | Mark Gardner | 27.3 | WAS |
| +020+ | 1.53 | Dave Stieb | 37.7 | TOR |
| +028+ | 1.46 | Doug Drabek | 37.3 | PIT |
| +035+ | 1.26 | Dennis Martinez | 43 | WAS |
| XXXXX | 1.24 | Bryn Smith | 41.7 | SLN |
| XXXXX | 1.18 | Jim Deshaies | 37.7 | HOU |
| XXXXX | 1.14 | Bill Sampen | 15.3 | WAS |
| XXXXX | 1.11 | Tom Glavine | 41.3 | ATL |
| XXXXX | 1.09 | Eric King | 29 | CHA |
| XXXXX | 1.08 | Dan Petry | 32.7 | DET |
| XXXXX | 0.98 | Scott Sanderson | 36 | OAK |
| XXXXX | 0.92 | Neal Heaton | 31.3 | PIT |
| XXXXX | 0.9 | Pete Smith | 32.3 | ATL |
| XXXXX | 0.83 | Tom Browning | 44.7 | CIN |
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