| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 5.4 | 199009100_SLN_NYN |
| Dave Stewart | OAK | 4.56 | 199009090_OAK_NYA |
| Norm Charlton | CIN | 3.37 | 199009110_HOU_CIN |
| Dennis Martinez | WAS | 2.84 | 199009090_WAS_PIT |
| Greg Hibbard | CHA | 2.29 | 199009101_CHA_CLE |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Tanana | DET | -7.75 | 199009100_DET_BAL |
| Mike Bielecki | CHN | -3.49 | 199009090_SLN_CHN |
| Mark Langston | ANA | -2.3 | 199009110_MIN_ANA |
| Sergio Valdez | CLE | -1.56 | 199009090_CLE_MIN |
| Tom Glavine | ATL | -1.14 | 199009090_ATL_SDN |
Based on accumulated WAA for this season up to 1990-09-11.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 6.8 | Ed Whitson | 204.7 | SDN |
| +007+ | 6.58 | Frank Viola | 214.3 | NYN |
| +010+ | 6.26 | Chuck Finley | 204 | ANA |
| +012+ | 5.84 | Dave Stewart | 234 | OAK |
| +013+ | 5.78 | Danny Darwin | 138.3 | HOU |
| +014+ | 5.74 | Doug Drabek | 202 | PIT |
| +022+ | 4.77 | Norm Charlton | 133 | CIN |
| +028+ | 4.43 | Dave Stieb | 178.3 | TOR |
| +030+ | 4.42 | Dennis Martinez | 213 | WAS |
| +033+ | 4.28 | Greg Hibbard | 188 | CHA |
| +036+ | 3.98 | Kevin Appier | 156.3 | KCA |
| +040+ | 3.9 | Zane Smith | 185.3 | TOT |
| +044+ | 3.71 | Kirk McCaskill | 156.7 | ANA |
| +051+ | 3.33 | Bob Welch | 208.3 | OAK |
| +054+ | 3.3 | Oil Can Boyd | 167.3 | WAS |
| +055+ | 3.26 | Bob Tewksbury | 125 | SLN |
| +060+ | 3.09 | Ramon Martinez | 201.3 | LAN |
| +073+ | 2.63 | Jose Rijo | 156 | CIN |
| +078+ | 2.51 | Dave Wells | 159.3 | TOR |
| +080+ | 2.48 | Matt Young | 195.7 | SEA |
| +081+ | 2.47 | Tom Bolton | 95 | BOS |
| +084+ | 2.4 | Mike Morgan | 193.7 | LAN |
| +088+ | 2.34 | Bruce Hurst | 199.3 | SDN |
| +094+ | 2.23 | Charlie Leibrandt | 132.7 | ATL |
| +098+ | 2.21 | Randy Tomlin | 55 | PIT |
_