| Starter | Tm | Tier | Game |
|---|---|---|---|
| Chuck Finley | ANA | 6.22 | 199009080_ANA_BAL |
| Frank Viola | NYN | 5.4 | 199009100_SLN_NYN |
| Dave Stewart | OAK | 4.56 | 199009090_OAK_NYA |
| Doug Drabek | PIT | 4.24 | 199009080_WAS_PIT |
| Dennis Martinez | WAS | 2.84 | 199009090_WAS_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Tanana | DET | -7.75 | 199009100_DET_BAL |
| Mike Bielecki | CHN | -3.49 | 199009090_SLN_CHN |
| Bruce Ruffin | PHI | -2.46 | 199009080_NYN_PHI |
| Sergio Valdez | CLE | -1.56 | 199009090_CLE_MIN |
| Jim Abbott | ANA | -1.3 | 199009100_MIN_ANA |
Based on accumulated WAA for this season up to 1990-09-10.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 9.95 | Roger Clemens | 222.3 | BOS |
| +005+ | 6.8 | Ed Whitson | 204.7 | SDN |
| +006+ | 6.58 | Frank Viola | 214.3 | NYN |
| +009+ | 6.26 | Chuck Finley | 204 | ANA |
| +012+ | 5.84 | Dave Stewart | 234 | OAK |
| +013+ | 5.77 | Danny Darwin | 138.3 | HOU |
| +014+ | 5.74 | Doug Drabek | 202 | PIT |
| +022+ | 4.77 | Norm Charlton | 126 | CIN |
| +030+ | 4.43 | Dave Stieb | 178.3 | TOR |
| +031+ | 4.4 | Dennis Martinez | 213 | WAS |
| +033+ | 4.27 | Greg Hibbard | 188 | CHA |
| +037+ | 3.98 | Kevin Appier | 156.3 | KCA |
| +040+ | 3.89 | Zane Smith | 185.3 | TOT |
| +044+ | 3.71 | Kirk McCaskill | 156.7 | ANA |
| +050+ | 3.33 | Bob Welch | 208.3 | OAK |
| +052+ | 3.29 | Oil Can Boyd | 167.3 | WAS |
| +054+ | 3.25 | Bob Tewksbury | 125 | SLN |
| +059+ | 3.08 | Ramon Martinez | 201.3 | LAN |
| +073+ | 2.63 | Jose Rijo | 156 | CIN |
| +079+ | 2.51 | Dave Wells | 159.3 | TOR |
| +082+ | 2.48 | Matt Young | 195.7 | SEA |
| +081+ | 2.48 | Bobby Witt | 188.7 | TEX |
| +083+ | 2.47 | Tom Bolton | 95 | BOS |
| +089+ | 2.38 | Mike Morgan | 193.7 | LAN |
| +091+ | 2.34 | Mike Hartley | 74.7 | LAN |
_