| Starter | Tm | Tier | Game |
|---|---|---|---|
| Doug Drabek | PIT | 4.94 | 199005210_PIT_HOU |
| Bryn Smith | SLN | 3.9 | 199005210_SLN_ATL |
| Ted Higuera | MIL | 3.76 | 199005210_SEA_MIL |
| Bob Welch | OAK | 2.94 | 199005210_OAK_TOR |
| Ed Whitson | SDN | 2.85 | 199005220_SDN_WAS |
| 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 |
| Andy Hawkins | NYA | -2.53 | 199005210_CHA_NYA |
| Todd Stottlemyre | TOR | -2.25 | 199005210_OAK_TOR |
Based on accumulated WAA for this season up to 1990-05-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 3.27 | Bob Welch | 65.7 | OAK |
| +005+ | 3.03 | Frank Viola | 59.7 | NYN |
| +008+ | 2.72 | Bud Black | 66.3 | CLE |
| +009+ | 2.56 | Jack Armstrong | 53.3 | CIN |
| +010+ | 2.4 | Chris Bosio | 63.3 | MIL |
| +012+ | 2.29 | Dave Stewart | 59.3 | OAK |
| +014+ | 2.15 | Mark Gardner | 47.3 | WAS |
| +015+ | 2.12 | Teddy Higuera | 46.3 | MIL |
| +018+ | 1.92 | Chuck Finley | 54 | ANA |
| +020+ | 1.88 | Dennis Cook | 53 | PHI |
| +021+ | 1.84 | Tom Glavine | 56.3 | ATL |
| +022+ | 1.82 | Tim Leary | 59.7 | NYA |
| +024+ | 1.78 | Doug Drabek | 52 | PIT |
| +028+ | 1.68 | Tom Browning | 67.3 | CIN |
| +029+ | 1.64 | Dennis Martinez | 65 | WAS |
| +033+ | 1.62 | Bob Walk | 45.7 | PIT |
| +037+ | 1.53 | Mike Witt | 26.3 | TOT |
| +039+ | 1.52 | Mark Knudson | 46.7 | MIL |
| +050+ | 1.39 | Dan Petry | 45.7 | DET |
| +053+ | 1.32 | Dave Stieb | 54 | TOR |
| +055+ | 1.29 | Jose DeLeon | 53.7 | SLN |
| XXXXX | 1.24 | Neal Heaton | 50.7 | PIT |
| XXXXX | 1.19 | Bret Saberhagen | 62.7 | KCA |
| XXXXX | 1.16 | Bobby Ojeda | 31.7 | NYN |
| XXXXX | 1.16 | Roger Clemens | 64 | BOS |
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