| Starter | Tm | Tier | Game |
|---|---|---|---|
| Chuck Finley | ANA | 6.93 | 199009180_DET_ANA |
| Ed Whitson | SDN | 6.77 | 199009180_SDN_HOU |
| Dave Stewart | OAK | 5.9 | 199009190_CHA_OAK |
| Danny Darwin | HOU | 5.61 | 199009170_SDN_HOU |
| Doug Drabek | PIT | 4.08 | 199009190_PIT_CHN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | DET | -5.44 | 199009190_DET_ANA |
| Derek Lilliquist | SDN | -2.89 | 199009190_SDN_LAN |
| Sergio Valdez | CLE | -1.51 | 199009190_MIL_CLE |
| Melido Perez | CHA | -1.37 | 199009170_CHA_OAK |
| Tom Glavine | ATL | -1.2 | 199009190_SFN_ATL |
Based on accumulated WAA for this season up to 1990-09-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 7.5 | Chuck Finley | 222 | ANA |
| +006+ | 7.24 | Ed Whitson | 218.7 | SDN |
| +007+ | 6.92 | Frank Viola | 222.3 | NYN |
| +008+ | 6.77 | Dave Stewart | 249 | OAK |
| +016+ | 5.73 | Danny Darwin | 149.7 | HOU |
| +022+ | 4.99 | Doug Drabek | 213.3 | PIT |
| +027+ | 4.62 | Steve Farr | 112.7 | KCA |
| +029+ | 4.58 | Kevin Appier | 169.7 | KCA |
| +031+ | 4.53 | Norm Charlton | 135 | CIN |
| +034+ | 4.38 | Zane Smith | 192.3 | TOT |
| +035+ | 4.35 | Dave Stieb | 191 | TOR |
| +039+ | 4.08 | Oil Can Boyd | 180.3 | WAS |
| +040+ | 4.07 | Greg Hibbard | 194.3 | CHA |
| +041+ | 4.05 | Bob Welch | 216.3 | OAK |
| +042+ | 4.03 | Jose Rijo | 174 | CIN |
| +043+ | 3.95 | Ramon Martinez | 210.3 | LAN |
| +048+ | 3.68 | Kirk McCaskill | 163 | ANA |
| +055+ | 3.4 | Tim Crews | 97.7 | LAN |
| +061+ | 3.17 | Bruce Hurst | 208.3 | SDN |
| +068+ | 2.85 | Greg Maddux | 217.7 | CHN |
| +075+ | 2.71 | Dave Wells | 168 | TOR |
| +088+ | 2.43 | Erik Hanson | 210.7 | SEA |
| +091+ | 2.39 | Randy Tomlin | 61.3 | PIT |
| +095+ | 2.37 | Charlie Leibrandt | 143.3 | ATL |
| +097+ | 2.33 | Mike Boddicker | 208.7 | BOS |
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