| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ed Whitson | SDN | 7.17 | 199009120_LAN_SDN |
| Chuck Finley | ANA | 6.09 | 199009130_SEA_ANA |
| Danny Darwin | HOU | 5.16 | 199009120_HOU_CIN |
| Doug Drabek | PIT | 5.12 | 199009130_PIT_NYN |
| Norm Charlton | CIN | 3.37 | 199009110_HOU_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | DET | -4.71 | 199009130_NYA_DET |
| Bruce Ruffin | PHI | -2.95 | 199009130_PHI_CHN |
| Mark Langston | ANA | -2.3 | 199009110_MIN_ANA |
| Melido Perez | CHA | -0.91 | 199009120_CHA_CLE |
| Chuck Cary | NYA | -0.57 | 199009110_TEX_NYA |
Based on accumulated WAA for this season up to 1990-09-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 6.89 | Chuck Finley | 213 | ANA |
| +006+ | 6.82 | Ed Whitson | 211.7 | SDN |
| +008+ | 6.6 | Frank Viola | 214.3 | NYN |
| +011+ | 6.18 | Danny Darwin | 145.3 | HOU |
| +014+ | 5.86 | Dave Stewart | 234 | OAK |
| +016+ | 5.31 | Doug Drabek | 206 | PIT |
| +023+ | 4.75 | Norm Charlton | 133 | CIN |
| +030+ | 4.45 | Dennis Martinez | 213 | WAS |
| +033+ | 4.31 | Greg Hibbard | 188 | CHA |
| +036+ | 4 | Kevin Appier | 156.3 | KCA |
| +038+ | 3.93 | Zane Smith | 185.3 | TOT |
| +040+ | 3.92 | Dave Stieb | 184 | TOR |
| +045+ | 3.73 | Kirk McCaskill | 156.7 | ANA |
| +047+ | 3.53 | Oil Can Boyd | 174.3 | WAS |
| +052+ | 3.35 | Bob Welch | 208.3 | OAK |
| +053+ | 3.2 | Jose Rijo | 165 | CIN |
| +058+ | 3.11 | Ramon Martinez | 201.3 | LAN |
| +067+ | 2.8 | Bob Tewksbury | 129 | SLN |
| +072+ | 2.73 | Ben McDonald | 88.3 | BAL |
| +078+ | 2.55 | Dave Wells | 159.3 | TOR |
| +079+ | 2.52 | Matt Young | 195.7 | SEA |
| +082+ | 2.43 | Greg Maddux | 208.7 | CHN |
| +084+ | 2.42 | Mike Morgan | 193.7 | LAN |
| +086+ | 2.41 | Charlie Leibrandt | 136.7 | ATL |
| +090+ | 2.36 | Bruce Hurst | 199.3 | SDN |
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