| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Gubicza | KCA | 4.52 | 199004160_CLE_KCA |
| Mark Langston | ANA | 3.58 | 199004170_OAK_ANA |
| Roger Clemens | BOS | 3.07 | 199004180_BOS_CHA |
| Greg Maddux | CHN | 2.67 | 199004180_CHN_NYN |
| Frank Viola | NYN | 2.24 | 199004160_NYN_CHN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Dotson | KCA | -3.67 | 199004170_CLE_KCA |
| Jack Morris | DET | -3.43 | 199004180_NYA_DET |
| Oil Can Boyd | WAS | -2.87 | 199004160_PHI_WAS |
| Pete Harnisch | BAL | -1.58 | 199004180_BAL_TOR |
| Jack Armstrong | CIN | -1.51 | 199004160_CIN_ATL |
Based on accumulated WAA for this season up to 1990-04-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| XXXXX | 1.18 | Chuck Finley | 14.3 | ANA |
| XXXXX | 1.17 | John Tudor | 13 | SLN |
| XXXXX | 1.17 | Frank Viola | 13.7 | NYN |
| XXXXX | 1.05 | Teddy Higuera | 11.3 | MIL |
| XXXXX | 0.95 | John Dopson | 10.7 | BOS |
| XXXXX | 0.91 | Jack Armstrong | 13 | CIN |
| XXXXX | 0.85 | Dennis Cook | 11.3 | PHI |
| XXXXX | 0.82 | Mike LaCoss | 14 | SFN |
| XXXXX | 0.82 | Bruce Ruffin | 13.3 | PHI |
| XXXXX | 0.79 | Rick Reuschel | 13.7 | SFN |
| XXXXX | 0.78 | Kirk McCaskill | 12 | ANA |
| XXXXX | 0.78 | Bob Welch | 11.7 | OAK |
| XXXXX | 0.72 | Chris Bosio | 10 | MIL |
| XXXXX | 0.7 | Mike Morgan | 14.7 | LAN |
| XXXXX | 0.7 | Neal Heaton | 12.7 | PIT |
| XXXXX | 0.67 | Dave Stieb | 12 | TOR |
| XXXXX | 0.64 | Storm Davis | 12.3 | KCA |
| XXXXX | 0.6 | Greg Maddux | 14.7 | CHN |
| XXXXX | 0.58 | Kevin Tapani | 11 | MIN |
| XXXXX | 0.52 | Scott Sanderson | 11 | OAK |
| XXXXX | 0.52 | Tim Belcher | 15 | LAN |
| XXXXX | 0.5 | Zane Smith | 13 | WAS |
| XXXXX | 0.49 | Charlie Hough | 12 | TEX |
| XXXXX | 0.49 | Mike Flanagan | 10 | TOR |
| XXXXX | 0.45 | Pascual Perez | 5 | NYA |
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