| Starter | Tm | Tier | Game |
|---|---|---|---|
| Chuck Finley | ANA | 8.02 | 199009230_ANA_KCA |
| Ed Whitson | SDN | 7.47 | 199009230_CIN_SDN |
| Dave Stewart | OAK | 6.54 | 199009250_OAK_KCA |
| Frank Viola | NYN | 6.08 | 199009240_NYN_CHN |
| Doug Drabek | PIT | 3.49 | 199009250_CHN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | DET | -6.08 | 199009250_SEA_DET |
| Derek Lilliquist | SDN | -3.25 | 199009240_SDN_SFN |
| Lester Lancaster | CHN | -1.1 | 199009240_NYN_CHN |
| Mark Langston | ANA | -1.1 | 199009240_ANA_TEX |
| Greg Swindell | CLE | -0.83 | 199009250_CLE_BOS |
Based on accumulated WAA for this season up to 1990-09-25.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 7.57 | Dave Stewart | 258 | OAK |
| +006+ | 7.2 | Chuck Finley | 228 | ANA |
| +012+ | 6.44 | Frank Viola | 235.7 | NYN |
| +014+ | 6.15 | Ed Whitson | 222.7 | SDN |
| +018+ | 5.6 | Danny Darwin | 155.7 | HOU |
| +020+ | 5.42 | Steve Farr | 121.7 | KCA |
| +025+ | 5.15 | Doug Drabek | 222.3 | PIT |
| +026+ | 5.12 | Zane Smith | 201.3 | TOT |
| +034+ | 4.61 | Ramon Martinez | 225.3 | LAN |
| +033+ | 4.61 | Jose Rijo | 183 | CIN |
| +035+ | 4.52 | Oil Can Boyd | 186.3 | WAS |
| +037+ | 4.47 | Dennis Martinez | 219 | WAS |
| +038+ | 4.44 | Kevin Appier | 177.7 | KCA |
| +041+ | 4.25 | Bob Welch | 223.3 | OAK |
| +042+ | 3.98 | Dave Stieb | 194.7 | TOR |
| +044+ | 3.88 | Norm Charlton | 146.7 | CIN |
| +059+ | 3.33 | Kirk McCaskill | 170.7 | ANA |
| +061+ | 3.25 | Greg Hibbard | 199.3 | CHA |
| +066+ | 3.16 | Charlie Leibrandt | 152.3 | ATL |
| +068+ | 3.15 | Dave Wells | 176 | TOR |
| +073+ | 2.92 | Bruce Hurst | 214.7 | SDN |
| +075+ | 2.82 | Ben McDonald | 101 | BAL |
| +080+ | 2.66 | Mike Boddicker | 214.7 | BOS |
| +083+ | 2.59 | Erik Hanson | 219.7 | SEA |
| +091+ | 2.41 | Randy Tomlin | 68.7 | PIT |
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