| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 6.39 | 199004250_SLN_LAN |
| Dennis Martinez | WAS | 3.15 | 199004250_WAS_HOU |
| Pascual Perez | NYA | 2.97 | 199004250_SEA_NYA |
| Frank Viola | NYN | 2.71 | 199004270_NYN_HOU |
| Jim Deshaies | HOU | 2.34 | 199004250_WAS_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Clancy | HOU | -3.7 | 199004260_HOU_ATL |
| Todd Stottlemyre | TOR | -2.55 | 199004250_CLE_TOR |
| Bobby Witt | TEX | -2.49 | 199004250_CHA_TEX |
| Melido Perez | CHA | -2.27 | 199004260_CHA_TEX |
| Jack Morris | DET | -2.14 | 199004270_MIL_DET |
Based on accumulated WAA for this season up to 1990-04-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.04 | Dennis Cook | 27.3 | PHI |
| +003+ | 1.8 | Teddy Higuera | 20.3 | MIL |
| +006+ | 1.52 | Frank Viola | 27.3 | NYN |
| +007+ | 1.48 | Mike Morgan | 23.7 | LAN |
| +008+ | 1.47 | Chris Bosio | 26 | MIL |
| +009+ | 1.43 | Zane Smith | 28 | WAS |
| +012+ | 1.38 | Chuck Finley | 20.7 | ANA |
| +014+ | 1.35 | Dennis Martinez | 27 | WAS |
| +015+ | 1.3 | Ed Whitson | 24 | SDN |
| +018+ | 1.25 | Bob Welch | 25 | OAK |
| XXXXX | 1.24 | John Tudor | 21 | SLN |
| XXXXX | 1.24 | Jack Armstrong | 19 | CIN |
| XXXXX | 1.23 | Jim Deshaies | 26 | HOU |
| XXXXX | 1.15 | Dave Stewart | 26.3 | OAK |
| XXXXX | 1.06 | Kirk McCaskill | 17 | ANA |
| XXXXX | 1.06 | Nolan Ryan | 28 | TEX |
| XXXXX | 1.06 | John Dopson | 12 | BOS |
| XXXXX | 0.95 | Brian Holman | 27 | SEA |
| XXXXX | 0.95 | Mike LaCoss | 27.7 | SFN |
| XXXXX | 0.91 | Tom Gordon | 17 | KCA |
| XXXXX | 0.86 | Pascual Perez | 14 | NYA |
| XXXXX | 0.86 | Ramon Martinez | 19 | LAN |
| XXXXX | 0.84 | Atlee Hammaker | 24 | SFN |
| XXXXX | 0.82 | Tom Filer | 14 | MIL |
| XXXXX | 0.82 | Mark Langston | 19 | ANA |
_