| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 6.16 | 199006060_WAS_NYN |
| Ted Higuera | MIL | 4.94 | 199006060_BAL_MIL |
| Doug Drabek | PIT | 4.53 | 199006060_CHN_PIT |
| Bret Saberhagen | KCA | 3.41 | 199006070_ANA_KCA |
| Bob Welch | OAK | 3.34 | 199006050_OAK_TEX |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -5.84 | 199006060_DET_CLE |
| Rich Dotson | KCA | -5.36 | 199006050_ANA_KCA |
| Andy Hawkins | NYA | -3.78 | 199006050_NYA_BOS |
| Bobby Witt | TEX | -2.75 | 199006070_OAK_TEX |
| Walt Terrell | PIT | -2.56 | 199006050_CHN_PIT |
Based on accumulated WAA for this season up to 1990-06-07.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 3.83 | Jack Armstrong | 76.3 | CIN |
| +005+ | 3.68 | Frank Viola | 78 | NYN |
| +009+ | 3.02 | Bob Welch | 85.3 | OAK |
| +010+ | 2.89 | Tom Browning | 82.3 | CIN |
| +012+ | 2.76 | Teddy Higuera | 55.3 | MIL |
| +016+ | 2.67 | Roger Clemens | 89 | BOS |
| +017+ | 2.6 | Dave Stewart | 80.7 | OAK |
| +019+ | 2.44 | Bret Saberhagen | 87.7 | KCA |
| +020+ | 2.37 | Dennis Martinez | 80 | WAS |
| +022+ | 2.27 | Bud Black | 84 | CLE |
| +024+ | 2.21 | Doug Drabek | 75 | PIT |
| +025+ | 2.2 | John Tudor | 61.7 | SLN |
| +027+ | 2.14 | Ed Whitson | 74 | SDN |
| +029+ | 2.12 | Dan Petry | 64.7 | DET |
| +030+ | 2.11 | Chris Bosio | 82.7 | MIL |
| +031+ | 2.08 | Tim Leary | 79.3 | NYA |
| +033+ | 2.06 | Mike Morgan | 77.7 | LAN |
| +032+ | 2.06 | Eric King | 62.7 | CHA |
| +034+ | 2.04 | Dave Stieb | 69 | TOR |
| +038+ | 1.92 | Mark Gardner | 56.3 | WAS |
| +039+ | 1.91 | Chuck Finley | 73 | ANA |
| +045+ | 1.81 | Neal Heaton | 68.3 | PIT |
| +047+ | 1.71 | Kirk McCaskill | 52 | ANA |
| +066+ | 1.44 | Bob Walk | 57.3 | PIT |
| +080+ | 1.28 | Greg Hibbard | 63.3 | CHA |
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