| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ted Higuera | MIL | 3.16 | 199004210_BOS_MIL |
| Tim Belcher | LAN | 3.05 | 199004200_HOU_LAN |
| Frank Viola | NYN | 3.05 | 199004210_WAS_NYN |
| Rick Reuschel | SFN | 2.72 | 199004200_SFN_SDN |
| Mark Gubicza | KCA | 2.48 | 199004210_KCA_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Clancy | HOU | -3.61 | 199004210_HOU_LAN |
| Oil Can Boyd | WAS | -3.01 | 199004210_WAS_NYN |
| Jack Morris | DET | -2.74 | 199004220_DET_BAL |
| Todd Stottlemyre | TOR | -2.45 | 199004200_KCA_TOR |
| Tom Glavine | ATL | -2.4 | 199004220_ATL_CIN |
Based on accumulated WAA for this season up to 1990-04-22.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 1.79 | Teddy Higuera | 20.3 | MIL |
| +003+ | 1.61 | Dennis Cook | 20.3 | PHI |
| +004+ | 1.47 | Chris Bosio | 19 | MIL |
| +005+ | 1.32 | Chuck Finley | 20.7 | ANA |
| +006+ | 1.27 | Kevin Tapani | 19 | MIN |
| XXXXX | 1.2 | Jack Armstrong | 19 | CIN |
| XXXXX | 1.13 | John Tudor | 13 | SLN |
| XXXXX | 1.06 | Frank Viola | 22.3 | NYN |
| XXXXX | 1.05 | John Dopson | 12 | BOS |
| XXXXX | 1.02 | Pascual Perez | 11 | NYA |
| XXXXX | 1 | Zane Smith | 21 | WAS |
| XXXXX | 0.93 | Bob Welch | 18.7 | OAK |
| XXXXX | 0.88 | Dave Stieb | 17 | TOR |
| XXXXX | 0.84 | Tim Leary | 13.7 | NYA |
| XXXXX | 0.84 | Ramon Martinez | 19 | LAN |
| XXXXX | 0.84 | Tom Gordon | 12 | KCA |
| XXXXX | 0.83 | Neal Heaton | 18.7 | PIT |
| XXXXX | 0.82 | David West | 18.7 | MIN |
| XXXXX | 0.8 | Kirk McCaskill | 12 | ANA |
| XXXXX | 0.78 | Atlee Hammaker | 16 | SFN |
| XXXXX | 0.77 | Dave Stewart | 19.3 | OAK |
| XXXXX | 0.73 | Dan Petry | 13 | DET |
| XXXXX | 0.71 | Dennis Martinez | 20 | WAS |
| XXXXX | 0.71 | Mike LaCoss | 20 | SFN |
| XXXXX | 0.67 | Mike Morgan | 14.7 | LAN |
_