| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 6.77 | 199006110_NYN_CHN |
| Doug Drabek | PIT | 5.14 | 199006110_PIT_SLN |
| Bret Saberhagen | KCA | 3.99 | 199006120_KCA_ANA |
| Bob Welch | OAK | 3.25 | 199006100_KCA_OAK |
| Jose Rijo | CIN | 2.4 | 199006122_ATL_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -5.75 | 199006100_SEA_DET |
| Walt Terrell | PIT | -2.48 | 199006100_PIT_NYN |
| Bobby Witt | TEX | -1.87 | 199006120_TEX_OAK |
| Bruce Ruffin | PHI | -1.67 | 199006100_PHI_CHN |
| Todd Stottlemyre | TOR | -1.61 | 199006120_TOR_MIN |
Based on accumulated WAA for this season up to 1990-06-12.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 4.05 | Jack Armstrong | 82.7 | CIN |
| +006+ | 3.77 | Tom Browning | 91.3 | CIN |
| +007+ | 3.65 | Frank Viola | 84 | NYN |
| +009+ | 3.46 | Dave Stewart | 89.7 | OAK |
| +010+ | 3.34 | Bob Welch | 93 | OAK |
| +015+ | 2.89 | Roger Clemens | 96 | BOS |
| +018+ | 2.68 | Chuck Finley | 81 | ANA |
| +021+ | 2.59 | Bret Saberhagen | 95 | KCA |
| +023+ | 2.54 | Mark Gardner | 65 | WAS |
| +026+ | 2.49 | Bud Black | 93 | CLE |
| +027+ | 2.4 | Dave Stieb | 77 | TOR |
| +028+ | 2.39 | Doug Drabek | 80.7 | PIT |
| +031+ | 2.26 | Eric King | 69 | CHA |
| +036+ | 2.12 | Tim Leary | 79.3 | NYA |
| +040+ | 2.01 | Kirk McCaskill | 57.3 | ANA |
| +046+ | 1.9 | Neal Heaton | 75.3 | PIT |
| +047+ | 1.89 | Dan Petry | 68.7 | DET |
| +051+ | 1.8 | Chris Bosio | 90.3 | MIL |
| +053+ | 1.78 | Ed Whitson | 79.3 | SDN |
| +057+ | 1.75 | Ramon Martinez | 78.3 | LAN |
| +056+ | 1.75 | Greg Hibbard | 70.3 | CHA |
| +061+ | 1.7 | Mike Morgan | 84.7 | LAN |
| +080+ | 1.47 | Mike Boddicker | 87.3 | BOS |
| +084+ | 1.43 | Bobby Ojeda | 52.7 | NYN |
| +091+ | 1.36 | Bill Krueger | 49 | MIL |
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