| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 6.71 | 199009150_PHI_NYN |
| Chuck Finley | ANA | 6.09 | 199009130_SEA_ANA |
| Dave Stewart | OAK | 5.26 | 199009140_MIN_OAK |
| Doug Drabek | PIT | 5.12 | 199009130_PIT_NYN |
| Dave Stieb | TOR | 3.03 | 199009130_BAL_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Tanana | DET | -6.82 | 199009150_NYA_DET |
| Bruce Ruffin | PHI | -2.95 | 199009130_PHI_CHN |
| Derek Lilliquist | SDN | -1.98 | 199009140_SDN_ATL |
| Sergio Valdez | CLE | -1.59 | 199009140_CLE_KCA |
| Tom Glavine | ATL | -1.47 | 199009140_SDN_ATL |
Based on accumulated WAA for this season up to 1990-09-15.
| 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 |
| +010+ | 6.43 | Dave Stewart | 243 | OAK |
| +013+ | 6.16 | Danny Darwin | 145.3 | HOU |
| +018+ | 5.32 | Doug Drabek | 206 | PIT |
| +024+ | 4.74 | Norm Charlton | 133 | CIN |
| +031+ | 4.34 | Zane Smith | 192.3 | TOT |
| +036+ | 4.05 | Bob Welch | 216.3 | OAK |
| +037+ | 4.03 | Greg Hibbard | 194.3 | CHA |
| +040+ | 3.91 | Ramon Martinez | 210.3 | LAN |
| +041+ | 3.91 | Dave Stieb | 184 | TOR |
| +045+ | 3.74 | Kevin Appier | 160.7 | KCA |
| +046+ | 3.66 | Kirk McCaskill | 163 | ANA |
| +049+ | 3.52 | Oil Can Boyd | 174.3 | WAS |
| +056+ | 3.19 | Jose Rijo | 165 | CIN |
| +070+ | 2.79 | Bob Tewksbury | 129 | SLN |
| +072+ | 2.73 | Ben McDonald | 88.3 | BAL |
| +073+ | 2.68 | Dave Wells | 168 | TOR |
| +082+ | 2.43 | Greg Maddux | 208.7 | CHN |
| +087+ | 2.4 | Erik Hanson | 210.7 | SEA |
| +086+ | 2.4 | Mike Morgan | 193.7 | LAN |
| +089+ | 2.38 | Charlie Leibrandt | 136.7 | ATL |
| +093+ | 2.35 | Mike Boddicker | 202.7 | BOS |
| +095+ | 2.34 | Bruce Hurst | 199.3 | SDN |
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