| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 6.39 | 199004250_SLN_LAN |
| Joe Magrane | SLN | 4.37 | 199004240_SLN_LAN |
| Dennis Martinez | WAS | 3.15 | 199004250_WAS_HOU |
| Chris Bosio | MIL | 3.07 | 199004240_KCA_MIL |
| Mark Langston | ANA | 2.98 | 199004240_ANA_BOS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Clancy | HOU | -3.7 | 199004260_HOU_ATL |
| Rich Dotson | KCA | -2.93 | 199004240_KCA_MIL |
| Todd Stottlemyre | TOR | -2.55 | 199004250_CLE_TOR |
| Bobby Witt | TEX | -2.49 | 199004250_CHA_TEX |
| Melido Perez | CHA | -2.27 | 199004260_CHA_TEX |
Based on accumulated WAA for this season up to 1990-04-26.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 1.79 | Teddy Higuera | 20.3 | MIL |
| +003+ | 1.6 | Dennis Cook | 20.3 | PHI |
| +005+ | 1.46 | Mike Morgan | 23.7 | LAN |
| +007+ | 1.45 | Chris Bosio | 26 | MIL |
| +010+ | 1.35 | Chuck Finley | 20.7 | ANA |
| +011+ | 1.32 | Dennis Martinez | 27 | WAS |
| +012+ | 1.28 | Ed Whitson | 24 | SDN |
| XXXXX | 1.22 | Bob Welch | 25 | OAK |
| XXXXX | 1.22 | Jack Armstrong | 19 | CIN |
| XXXXX | 1.21 | John Tudor | 21 | SLN |
| XXXXX | 1.2 | Jim Deshaies | 26 | HOU |
| XXXXX | 1.12 | Dave Stewart | 26.3 | OAK |
| XXXXX | 1.07 | Frank Viola | 22.3 | NYN |
| XXXXX | 1.05 | John Dopson | 12 | BOS |
| XXXXX | 1.04 | Kirk McCaskill | 17 | ANA |
| XXXXX | 1.04 | Nolan Ryan | 28 | TEX |
| XXXXX | 1 | Zane Smith | 21 | WAS |
| XXXXX | 0.93 | Mike LaCoss | 27.7 | SFN |
| XXXXX | 0.92 | Brian Holman | 27 | SEA |
| XXXXX | 0.87 | Tom Gordon | 12 | KCA |
| XXXXX | 0.86 | Pascual Perez | 14 | NYA |
| XXXXX | 0.84 | Ramon Martinez | 19 | LAN |
| XXXXX | 0.83 | Tim Leary | 13.7 | NYA |
| XXXXX | 0.82 | David West | 18.7 | MIN |
| XXXXX | 0.81 | Tom Filer | 14 | MIL |
_