| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 6.57 | 199004140_LAN_HOU |
| Joe Magrane | SLN | 4.22 | 199004140_SLN_PHI |
| Roger Clemens | BOS | 2.88 | 199004140_MIL_BOS |
| Doug Drabek | PIT | 2.49 | 199004140_CHN_PIT |
| Dennis Martinez | WAS | 2.2 | 199004140_NYN_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -2.96 | 199004130_BAL_DET |
| Walt Terrell | PIT | -2.81 | 199004150_CHN_PIT |
| Bobby Witt | TEX | -2.59 | 199004130_TEX_NYA |
| Todd Stottlemyre | TOR | -2.52 | 199004140_TOR_KCA |
| Bruce Ruffin | PHI | -2.4 | 199004140_SLN_PHI |
Based on accumulated WAA for this season up to 1990-04-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| XXXXX | 1.14 | Chuck Finley | 14.3 | ANA |
| XXXXX | 0.77 | Dennis Cook | 11.3 | PHI |
| XXXXX | 0.76 | Bob Welch | 11.7 | OAK |
| XXXXX | 0.74 | Bruce Ruffin | 13.3 | PHI |
| XXXXX | 0.72 | Rick Reuschel | 13.7 | SFN |
| XXXXX | 0.67 | Chris Bosio | 10 | MIL |
| XXXXX | 0.65 | Frank Viola | 7.7 | NYN |
| XXXXX | 0.64 | Greg Maddux | 7.7 | CHN |
| XXXXX | 0.61 | Dave Stieb | 12 | TOR |
| XXXXX | 0.56 | Mark Langston | 7 | ANA |
| XXXXX | 0.52 | Kevin Tapani | 11 | MIN |
| XXXXX | 0.51 | Mike Morgan | 8.3 | LAN |
| XXXXX | 0.51 | David West | 6 | MIN |
| XXXXX | 0.5 | John Tudor | 6 | SLN |
| XXXXX | 0.48 | Jack Armstrong | 6 | CIN |
| XXXXX | 0.45 | Tim Belcher | 15 | LAN |
| XXXXX | 0.45 | John Dopson | 5.3 | BOS |
| XXXXX | 0.44 | Charlie Hough | 12 | TEX |
| XXXXX | 0.44 | Teddy Higuera | 5 | MIL |
| XXXXX | 0.43 | Zane Smith | 13 | WAS |
| XXXXX | 0.43 | Erik Hanson | 5 | SEA |
| XXXXX | 0.42 | Pascual Perez | 5 | NYA |
| XXXXX | 0.42 | Neal Heaton | 5 | PIT |
| XXXXX | 0.4 | Dave Stewart | 12.3 | OAK |
| XXXXX | 0.4 | Tom Gordon | 5 | KCA |
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