| Starter | Tm | Tier | Game |
|---|---|---|---|
| Chuck Finley | ANA | 4.03 | 199007070_ANA_MIL |
| Bob Welch | OAK | 3.99 | 199007050_OAK_MIL |
| Ted Higuera | MIL | 3.76 | 199007050_OAK_MIL |
| John Tudor | SLN | 3.3 | 199007060_SLN_SDN |
| Greg Hibbard | CHA | 3.11 | 199007070_BAL_CHA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -6.94 | 199007060_KCA_DET |
| Walt Terrell | PIT | -4.75 | 199007070_PIT_LAN |
| Andy Hawkins | NYA | -3.37 | 199007061_MIN_NYA |
| Jimmy Key | TOR | -2.45 | 199007070_SEA_TOR |
| Sergio Valdez | CLE | -2.16 | 199007062_OAK_CLE |
Based on accumulated WAA for this season up to 1990-07-07.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +006+ | 4.43 | Jack Armstrong | 114.7 | CIN |
| +007+ | 4.39 | Frank Viola | 115.3 | NYN |
| +009+ | 4.36 | Roger Clemens | 129.7 | BOS |
| +014+ | 3.59 | Chuck Finley | 117 | ANA |
| +015+ | 3.43 | Dennis Martinez | 123 | WAS |
| +019+ | 3.23 | Tom Browning | 124.7 | CIN |
| +021+ | 3.04 | Mark Gardner | 95.7 | WAS |
| +022+ | 3.04 | Greg Hibbard | 101.3 | CHA |
| +027+ | 2.85 | Dave Stewart | 126 | OAK |
| +028+ | 2.84 | Bob Welch | 123.7 | OAK |
| +033+ | 2.71 | Bret Saberhagen | 121 | KCA |
| +035+ | 2.64 | Ed Whitson | 113.3 | SDN |
| +036+ | 2.58 | Teddy Higuera | 67.7 | MIL |
| +039+ | 2.44 | Eric King | 94.7 | CHA |
| +041+ | 2.42 | Bud Black | 124.3 | CLE |
| +044+ | 2.36 | Zane Smith | 104.3 | WAS |
| +045+ | 2.33 | John Tudor | 92 | SLN |
| +046+ | 2.32 | Danny Darwin | 57.3 | HOU |
| +050+ | 2.26 | Steve Farr | 54.3 | KCA |
| +055+ | 2.21 | Kirk McCaskill | 80.7 | ANA |
| +056+ | 2.2 | Trevor Wilson | 43 | SFN |
| +065+ | 1.89 | Ramon Martinez | 112.3 | LAN |
| +067+ | 1.85 | Kevin Appier | 77.3 | KCA |
| +079+ | 1.7 | Dave Stieb | 100 | TOR |
| +080+ | 1.67 | Greg Harris | 86.7 | BOS |
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