| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 16.04 | 199009040_OAK_BOS |
| Frank Viola | NYN | 4.69 | 199009051_NYN_PIT |
| Dave Stewart | OAK | 4.54 | 199009040_OAK_BOS |
| Doug Drabek | PIT | 3.7 | 199009030_PHI_PIT |
| Norm Charlton | CIN | 3.37 | 199009050_CIN_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Tanana | DET | -8.81 | 199009040_TOR_DET |
| Mike Bielecki | CHN | -4.23 | 199009040_CHN_WAS |
| David West | MIN | -2.96 | 199009040_MIN_MIL |
| Bruce Ruffin | PHI | -2.34 | 199009030_PHI_PIT |
| Jim Abbott | ANA | -1.75 | 199009050_ANA_NYA |
Based on accumulated WAA for this season up to 1990-09-05.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.04 | Roger Clemens | 222.3 | BOS |
| +005+ | 6.98 | Ed Whitson | 198.7 | SDN |
| +006+ | 6.43 | Chuck Finley | 196 | ANA |
| +008+ | 6.07 | Frank Viola | 206.3 | NYN |
| +012+ | 5.59 | Dave Stewart | 226 | OAK |
| +014+ | 5.31 | Doug Drabek | 194.3 | PIT |
| +015+ | 5.29 | Danny Darwin | 130.3 | HOU |
| +017+ | 4.78 | Norm Charlton | 126 | CIN |
| +025+ | 4.47 | John Tudor | 138.3 | SLN |
| +028+ | 4.39 | Dennis Martinez | 212.7 | WAS |
| +033+ | 3.97 | Greg Hibbard | 180 | CHA |
| +036+ | 3.82 | Bob Welch | 201.7 | OAK |
| +038+ | 3.75 | Dave Stieb | 170.3 | TOR |
| +041+ | 3.7 | Zane Smith | 178.3 | TOT |
| +042+ | 3.65 | Kevin Appier | 148 | KCA |
| +046+ | 3.45 | Kirk McCaskill | 148.7 | ANA |
| +053+ | 3.14 | Ramon Martinez | 192.3 | LAN |
| +056+ | 3.06 | Bob Tewksbury | 118 | SLN |
| +061+ | 2.92 | Oil Can Boyd | 160.7 | WAS |
| +075+ | 2.45 | Mike Harkey | 173.7 | CHN |
| +079+ | 2.39 | Tom Gordon | 168.7 | KCA |
| +086+ | 2.22 | Jose Rijo | 149 | CIN |
| +090+ | 2.12 | Sid Fernandez | 151 | NYN |
| +089+ | 2.12 | Matt Young | 188.7 | SEA |
| +092+ | 2.11 | Tom Bolton | 86 | BOS |
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