| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Gubicza | KCA | 4.52 | 199004160_CLE_KCA |
| Mark Langston | ANA | 3.58 | 199004170_OAK_ANA |
| Tim Belcher | LAN | 2.52 | 199004150_LAN_HOU |
| Frank Viola | NYN | 2.24 | 199004160_NYN_CHN |
| Ted Higuera | MIL | 2.22 | 199004160_MIL_BOS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Dotson | KCA | -3.67 | 199004170_CLE_KCA |
| Oil Can Boyd | WAS | -2.87 | 199004160_PHI_WAS |
| Walt Terrell | PIT | -2.81 | 199004150_CHN_PIT |
| Tom Glavine | ATL | -1.9 | 199004150_CIN_ATL |
| Jack Armstrong | CIN | -1.51 | 199004160_CIN_ATL |
Based on accumulated WAA for this season up to 1990-04-17.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| XXXXX | 1.14 | Chuck Finley | 14.3 | ANA |
| XXXXX | 1.13 | Frank Viola | 13.7 | NYN |
| XXXXX | 1.03 | Teddy Higuera | 11.3 | MIL |
| XXXXX | 0.92 | John Dopson | 10.7 | BOS |
| XXXXX | 0.87 | Jack Armstrong | 13 | CIN |
| XXXXX | 0.82 | Dennis Cook | 11.3 | PHI |
| XXXXX | 0.79 | Bruce Ruffin | 13.3 | PHI |
| XXXXX | 0.78 | Mike LaCoss | 14 | SFN |
| XXXXX | 0.75 | Rick Reuschel | 13.7 | SFN |
| XXXXX | 0.75 | Bob Welch | 11.7 | OAK |
| XXXXX | 0.7 | Chris Bosio | 10 | MIL |
| XXXXX | 0.67 | Neal Heaton | 12.7 | PIT |
| XXXXX | 0.64 | Dave Stieb | 12 | TOR |
| XXXXX | 0.62 | Greg Maddux | 7.7 | CHN |
| XXXXX | 0.55 | Kevin Tapani | 11 | MIN |
| XXXXX | 0.52 | Mike Morgan | 8.3 | LAN |
| XXXXX | 0.52 | John Tudor | 6 | SLN |
| XXXXX | 0.48 | Tim Belcher | 15 | LAN |
| XXXXX | 0.47 | Zane Smith | 13 | WAS |
| XXXXX | 0.46 | Charlie Hough | 12 | TEX |
| XXXXX | 0.46 | Mike Flanagan | 10 | TOR |
| XXXXX | 0.43 | Pascual Perez | 5 | NYA |
| XXXXX | 0.42 | Tom Gordon | 5 | KCA |
| XXXXX | 0.39 | Tim Leary | 7 | NYA |
| XXXXX | 0.38 | Dave Stewart | 12.3 | OAK |
_