| 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 |
| Bob Welch | OAK | 3.34 | 199006050_OAK_TEX |
| John Tudor | SLN | 2.81 | 199006040_PHI_SLN |
| 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 |
| Jim Clancy | HOU | -3.16 | 199006040_HOU_SDN |
| Walt Terrell | PIT | -2.56 | 199006050_CHN_PIT |
Based on accumulated WAA for this season up to 1990-06-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 3.86 | Jack Armstrong | 76.3 | CIN |
| +005+ | 3.71 | Frank Viola | 78 | NYN |
| +007+ | 3.04 | Bob Welch | 85.3 | OAK |
| +010+ | 2.92 | Tom Browning | 82.3 | CIN |
| +012+ | 2.78 | Teddy Higuera | 55.3 | MIL |
| +014+ | 2.72 | Bud Black | 77 | CLE |
| +015+ | 2.71 | Roger Clemens | 89 | BOS |
| +019+ | 2.62 | Dave Stewart | 80.7 | OAK |
| +020+ | 2.41 | Dennis Martinez | 80 | WAS |
| +023+ | 2.25 | Doug Drabek | 75 | PIT |
| +024+ | 2.22 | John Tudor | 61.7 | SLN |
| +026+ | 2.17 | Ed Whitson | 74 | SDN |
| +029+ | 2.15 | Dan Petry | 64.7 | DET |
| +028+ | 2.15 | Chris Bosio | 82.7 | MIL |
| +030+ | 2.11 | Tim Leary | 72.7 | NYA |
| +031+ | 2.1 | Mike Morgan | 77.7 | LAN |
| +032+ | 2.09 | Eric King | 62.7 | CHA |
| +033+ | 2.08 | Bret Saberhagen | 78.7 | KCA |
| +034+ | 2.07 | Dave Stieb | 69 | TOR |
| +035+ | 1.95 | Mark Gardner | 56.3 | WAS |
| +046+ | 1.73 | Kirk McCaskill | 52 | ANA |
| +052+ | 1.6 | Neal Heaton | 63.3 | PIT |
| +062+ | 1.47 | Bob Walk | 57.3 | PIT |
| +063+ | 1.43 | Chuck Finley | 65 | ANA |
| +078+ | 1.31 | Greg Hibbard | 63.3 | CHA |
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