| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 4.88 | 199005070_HOU_NYN |
| Ted Higuera | MIL | 4.25 | 199005060_MIN_MIL |
| Doug Drabek | PIT | 3.93 | 199005062_ATL_PIT |
| Bryn Smith | SLN | 3.45 | 199005060_CIN_SLN |
| Jim Deshaies | HOU | 3.43 | 199005061_HOU_NYN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -4.72 | 199005070_DET_MIL |
| Jim Clancy | HOU | -3.83 | 199005070_HOU_NYN |
| Curt Young | OAK | -2.92 | 199005060_BOS_OAK |
| Bobby Witt | TEX | -2.32 | 199005062_TEX_CLE |
| Walt Terrell | PIT | -2.29 | 199005080_SDN_PIT |
Based on accumulated WAA for this season up to 1990-05-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.71 | Frank Viola | 42.7 | NYN |
| +002+ | 2.25 | Mike Morgan | 38.7 | LAN |
| +003+ | 2.19 | Dennis Cook | 40.3 | PHI |
| +005+ | 2.13 | Jack Armstrong | 33.3 | CIN |
| +006+ | 2.08 | Dave Stewart | 41 | OAK |
| +007+ | 2.07 | Chuck Finley | 40 | ANA |
| +008+ | 1.96 | Bob Welch | 42 | OAK |
| +010+ | 1.91 | Bud Black | 43.7 | CLE |
| +012+ | 1.83 | Ed Whitson | 41 | SDN |
| +014+ | 1.74 | Teddy Higuera | 33.3 | MIL |
| +017+ | 1.59 | Greg Maddux | 36.7 | CHN |
| +018+ | 1.58 | Chris Bosio | 38.7 | MIL |
| +019+ | 1.57 | Mark Gardner | 27.3 | WAS |
| +021+ | 1.55 | John Tudor | 33.3 | SLN |
| +022+ | 1.54 | Dave Stieb | 37.7 | TOR |
| +027+ | 1.48 | Doug Drabek | 37.3 | PIT |
| +031+ | 1.32 | Pete Smith | 28.3 | ATL |
| +035+ | 1.28 | Dennis Martinez | 43 | WAS |
| +037+ | 1.25 | Bryn Smith | 41.7 | SLN |
| XXXXX | 1.2 | Tom Gordon | 23 | KCA |
| XXXXX | 1.19 | Jim Deshaies | 37.7 | HOU |
| XXXXX | 1.14 | Bill Sampen | 15.3 | WAS |
| XXXXX | 1.09 | Eric King | 29 | CHA |
| XXXXX | 1.04 | Tom Glavine | 41.3 | ATL |
| XXXXX | 1.02 | Scott Sanderson | 36 | OAK |
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