| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ed Whitson | SDN | 7.17 | 199009120_LAN_SDN |
| Frank Viola | NYN | 5.4 | 199009100_SLN_NYN |
| Danny Darwin | HOU | 5.16 | 199009120_HOU_CIN |
| Norm Charlton | CIN | 3.37 | 199009110_HOU_CIN |
| Greg Hibbard | CHA | 2.29 | 199009101_CHA_CLE |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Tanana | DET | -7.75 | 199009100_DET_BAL |
| Mark Langston | ANA | -2.3 | 199009110_MIN_ANA |
| Melido Perez | CHA | -0.91 | 199009120_CHA_CLE |
| Pete Harnisch | BAL | -0.69 | 199009100_DET_BAL |
| Charles Nagy | CLE | -0.61 | 199009102_CHA_CLE |
Based on accumulated WAA for this season up to 1990-09-12.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +006+ | 6.8 | Ed Whitson | 211.7 | SDN |
| +008+ | 6.59 | Frank Viola | 214.3 | NYN |
| +009+ | 6.28 | Chuck Finley | 204 | ANA |
| +011+ | 6.16 | Danny Darwin | 145.3 | HOU |
| +014+ | 5.86 | Dave Stewart | 234 | OAK |
| +015+ | 5.76 | Doug Drabek | 202 | PIT |
| +024+ | 4.74 | Norm Charlton | 133 | CIN |
| +028+ | 4.45 | Dave Stieb | 178.3 | TOR |
| +030+ | 4.43 | Dennis Martinez | 213 | WAS |
| +034+ | 4.3 | Greg Hibbard | 188 | CHA |
| +037+ | 3.98 | Kevin Appier | 156.3 | KCA |
| +041+ | 3.91 | Zane Smith | 185.3 | TOT |
| +045+ | 3.72 | Kirk McCaskill | 156.7 | ANA |
| +047+ | 3.52 | Oil Can Boyd | 174.3 | WAS |
| +053+ | 3.35 | Bob Welch | 208.3 | OAK |
| +055+ | 3.19 | Jose Rijo | 165 | CIN |
| +061+ | 3.1 | Ramon Martinez | 201.3 | LAN |
| +067+ | 2.8 | Bob Tewksbury | 129 | SLN |
| +073+ | 2.72 | Ben McDonald | 88.3 | BAL |
| +079+ | 2.53 | Dave Wells | 159.3 | TOR |
| +082+ | 2.49 | Matt Young | 195.7 | SEA |
| +085+ | 2.42 | Greg Maddux | 208.7 | CHN |
| +087+ | 2.41 | Mike Morgan | 193.7 | LAN |
| +088+ | 2.4 | Charlie Leibrandt | 136.7 | ATL |
| +090+ | 2.35 | Bruce Hurst | 199.3 | SDN |
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