| Starter | Tm | Tier | Game |
|---|---|---|---|
| Dennis Martinez | WAS | 7.05 | 199006290_ATL_WAS |
| Ted Higuera | MIL | 4.88 | 199006300_MIL_SEA |
| Bob Welch | OAK | 4.14 | 199006300_OAK_TOR |
| Mark Langston | ANA | 3.85 | 199007010_ANA_CLE |
| John Tudor | SLN | 3.71 | 199006300_SLN_LAN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -6.23 | 199007010_DET_KCA |
| Andy Hawkins | NYA | -4.61 | 199007010_NYA_CHA |
| Jim Abbott | ANA | -2 | 199006290_ANA_CLE |
| Mike Dunne | SDN | -1.5 | 199006290_CHN_SDN |
| Storm Davis | KCA | -1.04 | 199006300_DET_KCA |
Based on accumulated WAA for this season up to 1990-07-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +008+ | 4.04 | Jack Armstrong | 107.7 | CIN |
| +010+ | 3.93 | Roger Clemens | 122.7 | BOS |
| +011+ | 3.89 | Dave Stewart | 123.7 | OAK |
| +012+ | 3.66 | Eric King | 91 | CHA |
| +013+ | 3.61 | Frank Viola | 106.3 | NYN |
| +016+ | 3.4 | Bob Welch | 120.7 | OAK |
| +017+ | 3.39 | Greg Hibbard | 97.3 | CHA |
| +018+ | 3.39 | Dennis Martinez | 115 | WAS |
| +022+ | 2.99 | Chuck Finley | 99.7 | ANA |
| +025+ | 2.81 | Ramon Martinez | 108 | LAN |
| +028+ | 2.69 | Bret Saberhagen | 115.7 | KCA |
| +029+ | 2.66 | Kirk McCaskill | 75.3 | ANA |
| +031+ | 2.54 | Ed Whitson | 106.3 | SDN |
| +034+ | 2.51 | Tom Browning | 116.3 | CIN |
| +043+ | 2.27 | Mark Gardner | 86.7 | WAS |
| +045+ | 2.26 | Teddy Higuera | 60.7 | MIL |
| +048+ | 2.2 | John Tudor | 86 | SLN |
| +059+ | 1.94 | Danny Darwin | 51 | HOU |
| +072+ | 1.77 | Mike Boddicker | 110.7 | BOS |
| +079+ | 1.63 | Greg Harris | 81.7 | BOS |
| +080+ | 1.63 | Doug Drabek | 96.7 | PIT |
| +083+ | 1.59 | Mike Morgan | 110.7 | LAN |
| +095+ | 1.49 | Tim Leary | 109.3 | NYA |
| +094+ | 1.49 | Bill Gullickson | 92 | HOU |
| +100+ | 1.4 | Trevor Wilson | 34 | SFN |
_