| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 6.77 | 199006110_NYN_CHN |
| Doug Drabek | PIT | 5.14 | 199006110_PIT_SLN |
| Dave Stewart | OAK | 3.65 | 199006090_KCA_OAK |
| Chris Bosio | MIL | 3.54 | 199006090_TOR_MIL |
| Dave Stieb | TOR | 2.72 | 199006090_TOR_MIL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -5.75 | 199006100_SEA_DET |
| Jim Clancy | HOU | -2.85 | 199006090_CIN_HOU |
| Walt Terrell | PIT | -2.48 | 199006100_PIT_NYN |
| Bruce Ruffin | PHI | -1.67 | 199006100_PHI_CHN |
| Matt Young | SEA | -1.52 | 199006110_CHA_SEA |
Based on accumulated WAA for this season up to 1990-06-11.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 4.03 | Jack Armstrong | 82.7 | CIN |
| +005+ | 3.75 | Tom Browning | 91.3 | CIN |
| +007+ | 3.63 | Frank Viola | 84 | NYN |
| +009+ | 3.45 | Dave Stewart | 89.7 | OAK |
| +010+ | 3.33 | Bob Welch | 93 | OAK |
| +015+ | 2.86 | Roger Clemens | 96 | BOS |
| +019+ | 2.53 | Dennis Martinez | 86 | WAS |
| +020+ | 2.52 | Bret Saberhagen | 87.7 | KCA |
| +021+ | 2.52 | Mark Gardner | 65 | WAS |
| +026+ | 2.38 | Dave Stieb | 77 | TOR |
| +027+ | 2.38 | Doug Drabek | 80.7 | PIT |
| +029+ | 2.28 | Bud Black | 84 | CLE |
| +031+ | 2.24 | Eric King | 69 | CHA |
| +034+ | 2.11 | Tim Leary | 79.3 | NYA |
| +039+ | 2 | Kirk McCaskill | 57.3 | ANA |
| +041+ | 1.94 | Chuck Finley | 73 | ANA |
| +045+ | 1.88 | Dan Petry | 68.7 | DET |
| +046+ | 1.87 | Neal Heaton | 68.3 | PIT |
| +050+ | 1.79 | Chris Bosio | 90.3 | MIL |
| +052+ | 1.76 | Ed Whitson | 79.3 | SDN |
| +055+ | 1.73 | Greg Hibbard | 70.3 | CHA |
| +056+ | 1.72 | Ramon Martinez | 78.3 | LAN |
| +059+ | 1.67 | Mike Morgan | 84.7 | LAN |
| +074+ | 1.44 | Mike Boddicker | 87.3 | BOS |
| +078+ | 1.42 | Bobby Ojeda | 52.7 | NYN |
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