| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ed Whitson | SDN | 7.49 | 199009070_ATL_SDN |
| Frank Viola | NYN | 4.69 | 199009051_NYN_PIT |
| Danny Darwin | HOU | 4.29 | 199009070_HOU_SFN |
| Norm Charlton | CIN | 3.37 | 199009050_CIN_SFN |
| Greg Hibbard | CHA | 1.64 | 199009050_KCA_CHA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Andy Hawkins | NYA | -3.97 | 199009070_OAK_NYA |
| Jack Morris | DET | -3.56 | 199009070_DET_MIL |
| Allan Anderson | MIN | -2.14 | 199009070_CLE_MIN |
| Jim Abbott | ANA | -1.75 | 199009050_ANA_NYA |
| Melido Perez | CHA | -0.83 | 199009070_CHA_TOR |
Based on accumulated WAA for this season up to 1990-09-07.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 9.96 | Roger Clemens | 222.3 | BOS |
| +005+ | 6.83 | Ed Whitson | 204.7 | SDN |
| +007+ | 6.38 | Chuck Finley | 196 | ANA |
| +009+ | 6.06 | Frank Viola | 206.3 | NYN |
| +011+ | 5.77 | Danny Darwin | 138.3 | HOU |
| +013+ | 5.54 | Dave Stewart | 226 | OAK |
| +019+ | 4.77 | Norm Charlton | 126 | CIN |
| +022+ | 4.62 | John Tudor | 140.3 | SLN |
| +029+ | 4.36 | Dennis Martinez | 212.7 | WAS |
| +032+ | 3.95 | Greg Hibbard | 180 | CHA |
| +037+ | 3.78 | Bob Welch | 201.7 | OAK |
| +040+ | 3.72 | Dave Stieb | 170.3 | TOR |
| +041+ | 3.67 | Zane Smith | 178.3 | TOT |
| +043+ | 3.64 | Kevin Appier | 148 | KCA |
| +047+ | 3.41 | Kirk McCaskill | 148.7 | ANA |
| +049+ | 3.29 | Oil Can Boyd | 167.3 | WAS |
| +052+ | 3.24 | Bob Tewksbury | 125 | SLN |
| +057+ | 3.1 | Ramon Martinez | 192.3 | LAN |
| +070+ | 2.63 | Jose Rijo | 156 | CIN |
| +077+ | 2.52 | Bobby Witt | 188.7 | TEX |
| +081+ | 2.42 | Mike Harkey | 173.7 | CHN |
| +086+ | 2.34 | Mike Hartley | 74.7 | LAN |
| +090+ | 2.25 | Charlie Leibrandt | 132.7 | ATL |
| +094+ | 2.12 | Ben McDonald | 79.3 | BAL |
| +098+ | 2.11 | Sid Fernandez | 151 | NYN |
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