| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 6.88 | 199009201_WAS_NYN |
| Danny Darwin | HOU | 4.67 | 199009220_HOU_ATL |
| Norm Charlton | CIN | 2.9 | 199009200_CIN_HOU |
| Dennis Martinez | WAS | 2.83 | 199009210_WAS_PHI |
| Zane Smith | PIT | 2.71 | 199009210_SLN_PIT |
| 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 1990-09-22.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 7.53 | Chuck Finley | 222 | ANA |
| +006+ | 7.27 | Ed Whitson | 218.7 | SDN |
| +007+ | 6.78 | Dave Stewart | 249 | OAK |
| +011+ | 6.55 | Frank Viola | 229.7 | NYN |
| +017+ | 5.65 | Danny Darwin | 155.7 | HOU |
| +024+ | 5.19 | Zane Smith | 201.3 | TOT |
| +027+ | 5 | Doug Drabek | 213.3 | PIT |
| +028+ | 4.99 | Norm Charlton | 142.3 | CIN |
| +032+ | 4.64 | Jose Rijo | 183 | CIN |
| +033+ | 4.62 | Steve Farr | 112.7 | KCA |
| +034+ | 4.58 | Kevin Appier | 169.7 | KCA |
| +035+ | 4.57 | Dennis Martinez | 219 | WAS |
| +038+ | 4.35 | Ramon Martinez | 219.3 | LAN |
| +039+ | 4.31 | Dave Stieb | 191 | TOR |
| +040+ | 4.27 | Bob Welch | 223.3 | OAK |
| +042+ | 4.07 | Oil Can Boyd | 180.3 | WAS |
| +057+ | 3.34 | Kirk McCaskill | 170.7 | ANA |
| +061+ | 3.28 | Greg Hibbard | 199.3 | CHA |
| +065+ | 3.19 | Charlie Leibrandt | 152.3 | ATL |
| +066+ | 3.18 | Dave Wells | 176 | TOR |
| +073+ | 2.92 | Bruce Hurst | 214.7 | SDN |
| +074+ | 2.86 | Greg Maddux | 217.7 | CHN |
| +075+ | 2.86 | Bobby Witt | 210.7 | TEX |
| +078+ | 2.69 | Mike Boddicker | 214.7 | BOS |
| +083+ | 2.62 | Erik Hanson | 219.7 | SEA |
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