| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 5.92 | 199006030_BOS_CLE |
| Dave Stewart | OAK | 5.08 | 199006030_OAK_KCA |
| Dennis Martinez | WAS | 4.8 | 199006030_WAS_PIT |
| Chris Bosio | MIL | 4.45 | 199006040_BAL_MIL |
| Sid Fernandez | NYN | 3.61 | 199006030_NYN_PHI |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Clancy | HOU | -3.16 | 199006040_HOU_SDN |
| David West | MIN | -1.86 | 199006020_MIN_CHA |
| Jim Abbott | ANA | -1.37 | 199006030_ANA_TEX |
| Jeff Robinson | DET | -1.31 | 199006020_DET_SEA |
| Randy Johnson | SEA | -1.29 | 199006020_DET_SEA |
Based on accumulated WAA for this season up to 1990-06-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.84 | Jack Armstrong | 69.7 | CIN |
| +006+ | 3.26 | Frank Viola | 71 | NYN |
| +007+ | 3.19 | Bob Welch | 78.3 | OAK |
| +009+ | 2.86 | Tom Browning | 82.3 | CIN |
| +012+ | 2.66 | Bud Black | 77 | CLE |
| +013+ | 2.64 | Roger Clemens | 89 | BOS |
| +016+ | 2.55 | Dave Stewart | 80.7 | OAK |
| +018+ | 2.47 | Teddy Higuera | 52.3 | MIL |
| +020+ | 2.34 | Dennis Martinez | 80 | WAS |
| +022+ | 2.18 | John Tudor | 61.7 | SLN |
| +025+ | 2.11 | Ed Whitson | 74 | SDN |
| +026+ | 2.09 | Chris Bosio | 82.7 | MIL |
| +027+ | 2.04 | Eric King | 62.7 | CHA |
| +028+ | 2.02 | Tim Leary | 72.7 | NYA |
| +029+ | 2.01 | Bret Saberhagen | 78.7 | KCA |
| +030+ | 2.01 | Dave Stieb | 69 | TOR |
| +033+ | 1.95 | Greg Hibbard | 59.3 | CHA |
| +035+ | 1.9 | Mark Gardner | 56.3 | WAS |
| +040+ | 1.73 | Doug Drabek | 68 | PIT |
| +044+ | 1.69 | Kirk McCaskill | 52 | ANA |
| +048+ | 1.64 | Dan Petry | 59.7 | DET |
| +056+ | 1.52 | Dennis Cook | 65.7 | PHI |
| +057+ | 1.52 | Neal Heaton | 63.3 | PIT |
| +064+ | 1.4 | Bob Walk | 57.3 | PIT |
| +065+ | 1.39 | Bobby Ojeda | 38.7 | NYN |
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