| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 6.99 | 199004190_HOU_LAN |
| Joe Magrane | SLN | 4.55 | 199004190_PIT_SLN |
| Mark Langston | ANA | 3.58 | 199004170_OAK_ANA |
| Roger Clemens | BOS | 3.07 | 199004180_BOS_CHA |
| Greg Maddux | CHN | 2.67 | 199004180_CHN_NYN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Dotson | KCA | -3.67 | 199004170_CLE_KCA |
| Jack Morris | DET | -3.43 | 199004180_NYA_DET |
| Bobby Witt | TEX | -1.92 | 199004190_MIL_TEX |
| Pete Harnisch | BAL | -1.58 | 199004180_BAL_TOR |
| Matt Young | SEA | -1.36 | 199004180_MIN_SEA |
Based on accumulated WAA for this season up to 1990-04-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 1.51 | Chris Bosio | 19 | MIL |
| XXXXX | 1.16 | Chuck Finley | 14.3 | ANA |
| XXXXX | 1.15 | Frank Viola | 13.7 | NYN |
| XXXXX | 1.14 | John Tudor | 13 | SLN |
| XXXXX | 1.03 | Teddy Higuera | 11.3 | MIL |
| XXXXX | 0.99 | Pascual Perez | 11 | NYA |
| XXXXX | 0.94 | John Dopson | 10.7 | BOS |
| XXXXX | 0.89 | Jack Armstrong | 13 | CIN |
| XXXXX | 0.82 | Dennis Cook | 11.3 | PHI |
| XXXXX | 0.8 | Mike LaCoss | 14 | SFN |
| XXXXX | 0.78 | Dave Stewart | 19.3 | OAK |
| XXXXX | 0.77 | Bob Welch | 11.7 | OAK |
| XXXXX | 0.77 | Rick Reuschel | 13.7 | SFN |
| XXXXX | 0.76 | Kirk McCaskill | 12 | ANA |
| XXXXX | 0.68 | Neal Heaton | 12.7 | PIT |
| XXXXX | 0.67 | Mike Morgan | 14.7 | LAN |
| XXXXX | 0.66 | Dennis Martinez | 20 | WAS |
| XXXXX | 0.65 | Dave Stieb | 12 | TOR |
| XXXXX | 0.62 | Storm Davis | 12.3 | KCA |
| XXXXX | 0.6 | Greg Maddux | 14.7 | CHN |
| XXXXX | 0.56 | Kevin Tapani | 11 | MIN |
| XXXXX | 0.5 | Bruce Ruffin | 19.3 | PHI |
| XXXXX | 0.5 | Scott Sanderson | 11 | OAK |
| XXXXX | 0.49 | Tim Belcher | 15 | LAN |
| XXXXX | 0.48 | Zane Smith | 13 | WAS |
_