| Starter | Tm | Tier | Game |
|---|---|---|---|
| Chuck Finley | ANA | 8.02 | 199009230_ANA_KCA |
| Ed Whitson | SDN | 7.47 | 199009230_CIN_SDN |
| Danny Darwin | HOU | 4.67 | 199009220_HOU_ATL |
| Steve Farr | KCA | 2.96 | 199009230_ANA_KCA |
| Dennis Martinez | WAS | 2.83 | 199009210_WAS_PHI |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Tanana | DET | -5.99 | 199009210_DET_OAK |
| Steve Avery | ATL | -1.72 | 199009210_HOU_ATL |
| 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 1990-09-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 7.21 | Chuck Finley | 228 | ANA |
| +008+ | 6.75 | Dave Stewart | 249 | OAK |
| +011+ | 6.52 | Frank Viola | 229.7 | NYN |
| +014+ | 6.13 | Ed Whitson | 222.7 | SDN |
| +018+ | 5.64 | Danny Darwin | 155.7 | HOU |
| +019+ | 5.43 | Steve Farr | 121.7 | KCA |
| +025+ | 5.11 | Zane Smith | 201.3 | TOT |
| +028+ | 4.97 | Norm Charlton | 142.3 | CIN |
| +027+ | 4.97 | Doug Drabek | 213.3 | PIT |
| +032+ | 4.62 | Jose Rijo | 183 | CIN |
| +034+ | 4.56 | Kevin Appier | 169.7 | KCA |
| +035+ | 4.51 | Oil Can Boyd | 186.3 | WAS |
| +037+ | 4.46 | Dennis Martinez | 219 | WAS |
| +040+ | 4.32 | Ramon Martinez | 219.3 | LAN |
| +042+ | 4.24 | Bob Welch | 223.3 | OAK |
| +043+ | 3.97 | Dave Stieb | 194.7 | TOR |
| +058+ | 3.33 | Kirk McCaskill | 170.7 | ANA |
| +061+ | 3.26 | Greg Hibbard | 199.3 | CHA |
| +066+ | 3.16 | Charlie Leibrandt | 152.3 | ATL |
| +067+ | 3.14 | Dave Wells | 176 | TOR |
| +073+ | 2.9 | Bruce Hurst | 214.7 | SDN |
| +074+ | 2.84 | Bobby Witt | 210.7 | TEX |
| +075+ | 2.82 | Ben McDonald | 101 | BAL |
| +079+ | 2.67 | Mike Boddicker | 214.7 | BOS |
| +081+ | 2.59 | Erik Hanson | 219.7 | SEA |
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