| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 8.67 | 199007030_BOS_MIN |
| Frank Viola | NYN | 6.3 | 199007030_HOU_NYN |
| Mark Langston | ANA | 3.85 | 199007010_ANA_CLE |
| Eric King | CHA | 3.61 | 199007030_DET_CHA |
| Ed Whitson | SDN | 3.3 | 199007030_PIT_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -6.23 | 199007010_DET_KCA |
| Andy Hawkins | NYA | -4.61 | 199007010_NYA_CHA |
| Walt Terrell | PIT | -4.19 | 199007020_PIT_SDN |
| Jimmy Key | TOR | -2.14 | 199007020_OAK_TOR |
| Bobby Witt | TEX | -1.98 | 199007030_BAL_TEX |
Based on accumulated WAA for this season up to 1990-07-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +006+ | 4.4 | Frank Viola | 115.3 | NYN |
| +007+ | 4.35 | Roger Clemens | 129.7 | BOS |
| +011+ | 4.02 | Jack Armstrong | 107.7 | CIN |
| +012+ | 3.86 | Dave Stewart | 123.7 | OAK |
| +013+ | 3.53 | Chuck Finley | 108 | ANA |
| +015+ | 3.38 | Bob Welch | 120.7 | OAK |
| +016+ | 3.37 | Greg Hibbard | 97.3 | CHA |
| +017+ | 3.36 | Dennis Martinez | 115 | WAS |
| +020+ | 3.24 | Tom Browning | 124.7 | CIN |
| +026+ | 2.79 | Ramon Martinez | 108 | LAN |
| +030+ | 2.66 | Ed Whitson | 113.3 | SDN |
| +032+ | 2.65 | Kirk McCaskill | 75.3 | ANA |
| +038+ | 2.5 | Eric King | 94.7 | CHA |
| +046+ | 2.24 | Teddy Higuera | 60.7 | MIL |
| +045+ | 2.24 | Mark Gardner | 86.7 | WAS |
| +047+ | 2.2 | Trevor Wilson | 43 | SFN |
| +048+ | 2.2 | John Tudor | 86 | SLN |
| +050+ | 2.17 | Mike Boddicker | 119.7 | BOS |
| +052+ | 2.14 | Steve Farr | 53 | KCA |
| +059+ | 1.94 | Danny Darwin | 51 | HOU |
| +074+ | 1.75 | Zane Smith | 97.3 | WAS |
| +081+ | 1.63 | Bud Black | 115.3 | CLE |
| +083+ | 1.62 | Greg Harris | 81.7 | BOS |
| +091+ | 1.56 | Mike Morgan | 110.7 | LAN |
| +097+ | 1.49 | Bill Gullickson | 92 | HOU |
_