| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 6.71 | 199009150_PHI_NYN |
| Danny Darwin | HOU | 5.61 | 199009170_SDN_HOU |
| Norm Charlton | CIN | 3.38 | 199009160_LAN_CIN |
| Greg Hibbard | CHA | 2.83 | 199009150_BOS_CHA |
| Zane Smith | PIT | 2.35 | 199009150_PIT_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Tanana | DET | -6.82 | 199009150_NYA_DET |
| Steve Avery | ATL | -1.45 | 199009160_SDN_ATL |
| Mark Langston | ANA | -1.42 | 199009160_SEA_ANA |
| Melido Perez | CHA | -1.37 | 199009170_CHA_OAK |
| Jose DeLeon | SLN | -1.02 | 199009150_CHN_SLN |
Based on accumulated WAA for this season up to 1990-09-17.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 6.88 | Frank Viola | 222.3 | NYN |
| +006+ | 6.87 | Chuck Finley | 213 | ANA |
| +007+ | 6.79 | Ed Whitson | 211.7 | SDN |
| +011+ | 6.4 | Dave Stewart | 243 | OAK |
| +016+ | 5.71 | Danny Darwin | 149.7 | HOU |
| +018+ | 5.33 | Doug Drabek | 206 | PIT |
| +027+ | 4.61 | Steve Farr | 112.7 | KCA |
| +029+ | 4.5 | Norm Charlton | 135 | CIN |
| +033+ | 4.34 | Zane Smith | 192.3 | TOT |
| +037+ | 4.02 | Greg Hibbard | 194.3 | CHA |
| +038+ | 4.01 | Bob Welch | 216.3 | OAK |
| +039+ | 3.99 | Jose Rijo | 174 | CIN |
| +041+ | 3.92 | Ramon Martinez | 210.3 | LAN |
| +042+ | 3.9 | Dave Stieb | 184 | TOR |
| +046+ | 3.74 | Kevin Appier | 160.7 | KCA |
| +047+ | 3.65 | Kirk McCaskill | 163 | ANA |
| +050+ | 3.52 | Oil Can Boyd | 174.3 | WAS |
| +054+ | 3.38 | Tim Crews | 97.7 | LAN |
| +059+ | 3.13 | Bruce Hurst | 208.3 | SDN |
| +072+ | 2.79 | Bob Tewksbury | 129 | SLN |
| +076+ | 2.68 | Dave Wells | 168 | TOR |
| +087+ | 2.43 | Greg Maddux | 208.7 | CHN |
| +090+ | 2.39 | Erik Hanson | 210.7 | SEA |
| +091+ | 2.38 | Randy Tomlin | 61.3 | PIT |
| +094+ | 2.35 | Charlie Leibrandt | 143.3 | ATL |
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