| Starter | Tm | Tier | Game |
|---|---|---|---|
| Chuck Finley | ANA | 8.02 | 199009230_ANA_KCA |
| Ed Whitson | SDN | 7.47 | 199009230_CIN_SDN |
| Frank Viola | NYN | 6.08 | 199009240_NYN_CHN |
| Danny Darwin | HOU | 4.67 | 199009220_HOU_ATL |
| Steve Farr | KCA | 2.96 | 199009230_ANA_KCA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -3.4 | 199009230_DET_OAK |
| Derek Lilliquist | SDN | -3.25 | 199009240_SDN_SFN |
| Jeff Shaw | CLE | -1.46 | 199009220_CLE_TOR |
| Allan Anderson | MIN | -1.39 | 199009220_TEX_MIN |
| Jim Abbott | ANA | -1.39 | 199009220_ANA_KCA |
Based on accumulated WAA for this season up to 1990-09-24.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 7.21 | Chuck Finley | 228 | ANA |
| +008+ | 6.77 | Dave Stewart | 249 | OAK |
| +012+ | 6.46 | Frank Viola | 235.7 | NYN |
| +014+ | 6.15 | Ed Whitson | 222.7 | SDN |
| +018+ | 5.62 | Danny Darwin | 155.7 | HOU |
| +019+ | 5.43 | Steve Farr | 121.7 | KCA |
| +024+ | 5.12 | Zane Smith | 201.3 | TOT |
| +027+ | 4.98 | Doug Drabek | 213.3 | PIT |
| +028+ | 4.97 | Norm Charlton | 142.3 | CIN |
| +032+ | 4.62 | Jose Rijo | 183 | CIN |
| +034+ | 4.56 | Kevin Appier | 169.7 | KCA |
| +035+ | 4.53 | Oil Can Boyd | 186.3 | WAS |
| +036+ | 4.48 | Dennis Martinez | 219 | WAS |
| +040+ | 4.3 | Ramon Martinez | 219.3 | LAN |
| +041+ | 4.26 | Bob Welch | 223.3 | OAK |
| +043+ | 3.98 | Dave Stieb | 194.7 | TOR |
| +058+ | 3.33 | Kirk McCaskill | 170.7 | ANA |
| +060+ | 3.26 | Greg Hibbard | 199.3 | CHA |
| +066+ | 3.17 | Charlie Leibrandt | 152.3 | ATL |
| +067+ | 3.15 | Dave Wells | 176 | TOR |
| +073+ | 2.92 | Bruce Hurst | 214.7 | SDN |
| +074+ | 2.85 | Bobby Witt | 210.7 | TEX |
| +075+ | 2.81 | Ben McDonald | 101 | BAL |
| +079+ | 2.68 | Mike Boddicker | 214.7 | BOS |
| +080+ | 2.6 | Erik Hanson | 219.7 | SEA |
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