| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 13.71 | 199009290_TOR_BOS |
| Chuck Finley | ANA | 7.11 | 199009280_KCA_ANA |
| Frank Viola | NYN | 5.52 | 199009290_CHN_NYN |
| Ed Whitson | SDN | 5.08 | 199009290_SDN_CIN |
| Danny Darwin | HOU | 4.26 | 199009280_ATL_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | DET | -4.76 | 199009300_MIN_DET |
| Derek Lilliquist | SDN | -3.1 | 199009300_SDN_CIN |
| Sergio Valdez | CLE | -1.32 | 199009280_BAL_CLE |
| Mike Moore | OAK | -1.3 | 199009280_OAK_TEX |
| Jaime Navarro | MIL | -1.21 | 199009290_NYA_MIL |
Based on accumulated WAA for this season up to 1990-09-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.54 | Roger Clemens | 228.3 | BOS |
| +005+ | 7.86 | Chuck Finley | 236 | ANA |
| +009+ | 6.99 | Frank Viola | 242.7 | NYN |
| +014+ | 6.46 | Ed Whitson | 228.7 | SDN |
| +015+ | 6.17 | Danny Darwin | 162.7 | HOU |
| +018+ | 5.88 | Doug Drabek | 231.3 | PIT |
| +019+ | 5.86 | Zane Smith | 210.3 | TOT |
| +021+ | 5.66 | Steve Farr | 127 | KCA |
| +026+ | 5.2 | Jose Rijo | 197 | CIN |
| +031+ | 4.9 | Kevin Appier | 185.7 | KCA |
| +035+ | 4.59 | Ramon Martinez | 225.3 | LAN |
| +039+ | 4.46 | Bob Welch | 231 | OAK |
| +040+ | 4.4 | Dennis Martinez | 226 | WAS |
| +041+ | 4.16 | Dave Stieb | 201.7 | TOR |
| +047+ | 3.82 | Norm Charlton | 153.3 | CIN |
| +048+ | 3.8 | Oil Can Boyd | 190.7 | WAS |
| +050+ | 3.69 | Greg Hibbard | 207.3 | CHA |
| +053+ | 3.6 | Ben McDonald | 110 | BAL |
| +054+ | 3.5 | Bruce Hurst | 223.7 | SDN |
| +061+ | 3.33 | Dave Wells | 183 | TOR |
| +074+ | 2.87 | Charlie Leibrandt | 156.3 | ATL |
| +080+ | 2.68 | Scott Erickson | 113 | MIN |
| +082+ | 2.6 | Randy Tomlin | 75.7 | PIT |
| +083+ | 2.57 | Erik Hanson | 227 | SEA |
| +085+ | 2.53 | Mike Boddicker | 221 | BOS |
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