| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 5.91 | 199005240_SDN_NYN |
| Roger Clemens | BOS | 4.28 | 199005240_KCA_BOS |
| Dave Stewart | OAK | 3.21 | 199005240_MIL_OAK |
| Ed Whitson | SDN | 2.85 | 199005220_SDN_WAS |
| Tim Belcher | LAN | 2.06 | 199005230_LAN_CHN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -5.44 | 199005220_KCA_DET |
| Rich Dotson | KCA | -4.19 | 199005220_KCA_DET |
| Bobby Witt | TEX | -2.68 | 199005220_TEX_BOS |
| Bruce Ruffin | PHI | -1.9 | 199005240_ATL_PHI |
| Melido Perez | CHA | -1.66 | 199005220_CHA_NYA |
Based on accumulated WAA for this season up to 1990-05-24.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 3.29 | Bob Welch | 65.7 | OAK |
| +006+ | 2.93 | Dave Stewart | 66.3 | OAK |
| +008+ | 2.74 | Bud Black | 66.3 | CLE |
| +009+ | 2.58 | Jack Armstrong | 53.3 | CIN |
| +010+ | 2.51 | Frank Viola | 63 | NYN |
| +011+ | 2.44 | Chris Bosio | 63.3 | MIL |
| +014+ | 2.16 | Mark Gardner | 47.3 | WAS |
| +015+ | 2.14 | Teddy Higuera | 46.3 | MIL |
| +019+ | 1.91 | Chuck Finley | 54 | ANA |
| +020+ | 1.89 | Dennis Cook | 53 | PHI |
| +022+ | 1.87 | Tom Glavine | 56.3 | ATL |
| +025+ | 1.84 | Tim Leary | 59.7 | NYA |
| +027+ | 1.79 | Doug Drabek | 52 | PIT |
| +028+ | 1.78 | Roger Clemens | 73 | BOS |
| +029+ | 1.71 | Tom Browning | 67.3 | CIN |
| +030+ | 1.65 | Dennis Martinez | 65 | WAS |
| +032+ | 1.64 | Bob Walk | 45.7 | PIT |
| +037+ | 1.54 | Mark Knudson | 46.7 | MIL |
| +053+ | 1.4 | Dan Petry | 45.7 | DET |
| +057+ | 1.32 | Dave Stieb | 54 | TOR |
| +056+ | 1.32 | Mike Witt | 33.3 | TOT |
| +060+ | 1.26 | Jose DeLeon | 53.7 | SLN |
| XXXXX | 1.25 | Neal Heaton | 50.7 | PIT |
| XXXXX | 1.22 | Bret Saberhagen | 62.7 | KCA |
| XXXXX | 1.17 | John Tudor | 48 | SLN |
_