| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ed Whitson | SDN | 7.49 | 199009070_ATL_SDN |
| Chuck Finley | ANA | 6.22 | 199009080_ANA_BAL |
| Danny Darwin | HOU | 4.29 | 199009070_HOU_SFN |
| Doug Drabek | PIT | 4.24 | 199009080_WAS_PIT |
| Dave Stieb | TOR | 2.11 | 199009080_CHA_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Andy Hawkins | NYA | -3.97 | 199009070_OAK_NYA |
| Walt Terrell | DET | -3.84 | 199009080_DET_MIL |
| Bruce Ruffin | PHI | -2.46 | 199009080_NYN_PHI |
| Allan Anderson | MIN | -2.14 | 199009070_CLE_MIN |
| Mark Langston | ANA | -1.61 | 199009060_ANA_NYA |
Based on accumulated WAA for this season up to 1990-09-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 9.96 | Roger Clemens | 222.3 | BOS |
| +005+ | 6.83 | Ed Whitson | 204.7 | SDN |
| +008+ | 6.26 | Chuck Finley | 204 | ANA |
| +009+ | 6.06 | Frank Viola | 206.3 | NYN |
| +011+ | 5.76 | Danny Darwin | 138.3 | HOU |
| +012+ | 5.75 | Doug Drabek | 202 | PIT |
| +015+ | 5.54 | Dave Stewart | 226 | OAK |
| +020+ | 4.77 | Norm Charlton | 126 | CIN |
| +030+ | 4.44 | Dave Stieb | 178.3 | TOR |
| +032+ | 4.38 | Dennis Martinez | 212.7 | WAS |
| +034+ | 3.99 | Kevin Appier | 156.3 | KCA |
| +035+ | 3.96 | Greg Hibbard | 180 | CHA |
| +042+ | 3.78 | Bob Welch | 201.7 | OAK |
| +043+ | 3.68 | Zane Smith | 178.3 | TOT |
| +046+ | 3.41 | Kirk McCaskill | 148.7 | ANA |
| +049+ | 3.3 | Oil Can Boyd | 167.3 | WAS |
| +052+ | 3.25 | Bob Tewksbury | 125 | SLN |
| +059+ | 3.1 | Ramon Martinez | 192.3 | LAN |
| +070+ | 2.62 | Jose Rijo | 156 | CIN |
| +077+ | 2.52 | Bobby Witt | 188.7 | TEX |
| +079+ | 2.47 | Tom Bolton | 95 | BOS |
| +083+ | 2.42 | Mike Harkey | 173.7 | CHN |
| +088+ | 2.34 | Mike Hartley | 74.7 | LAN |
| +094+ | 2.25 | Charlie Leibrandt | 132.7 | ATL |
| +100+ | 2.12 | Ben McDonald | 79.3 | BAL |
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