| 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 |
| Norm Charlton | CIN | 3.37 | 199009050_CIN_SFN |
| Dennis Martinez | WAS | 2.97 | 199009040_CHN_WAS |
| 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 |
| Jim Abbott | ANA | -1.75 | 199009050_ANA_NYA |
| Sergio Valdez | CLE | -1.42 | 199009040_CLE_TEX |
Based on accumulated WAA for this season up to 1990-09-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.04 | Roger Clemens | 222.3 | BOS |
| +005+ | 6.97 | Ed Whitson | 198.7 | SDN |
| +006+ | 6.4 | Chuck Finley | 196 | ANA |
| +009+ | 6.09 | Frank Viola | 206.3 | NYN |
| +012+ | 5.59 | Dave Stewart | 226 | OAK |
| +014+ | 5.31 | Doug Drabek | 194.3 | PIT |
| +015+ | 5.28 | Danny Darwin | 130.3 | HOU |
| +018+ | 4.78 | Norm Charlton | 126 | CIN |
| +022+ | 4.65 | John Tudor | 140.3 | SLN |
| +029+ | 4.4 | 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 |
| +040+ | 3.71 | Zane Smith | 178.3 | TOT |
| +041+ | 3.66 | Kevin Appier | 148 | KCA |
| +048+ | 3.43 | Kirk McCaskill | 148.7 | ANA |
| +055+ | 3.14 | Ramon Martinez | 192.3 | LAN |
| +056+ | 3.06 | Bob Tewksbury | 118 | SLN |
| +061+ | 2.93 | Oil Can Boyd | 160.7 | WAS |
| +074+ | 2.56 | Bobby Witt | 188.7 | TEX |
| +078+ | 2.45 | Mike Harkey | 173.7 | CHN |
| +081+ | 2.4 | Tom Gordon | 168.7 | KCA |
| +084+ | 2.35 | Mike Hartley | 74.7 | LAN |
| +089+ | 2.23 | Jose Rijo | 149 | CIN |
| +092+ | 2.13 | Sid Fernandez | 151 | NYN |
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