| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 7.17 | 199005180_NYN_SDN |
| Roger Clemens | BOS | 3.79 | 199005190_MIN_BOS |
| Dave Stewart | OAK | 2.55 | 199005190_OAK_MIL |
| Dave Stieb | TOR | 2.03 | 199005180_ANA_TOR |
| Bruce Hurst | SDN | 1.96 | 199005180_NYN_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -5.04 | 199005170_DET_TEX |
| Jim Clancy | HOU | -4.14 | 199005190_CHN_HOU |
| Walt Terrell | PIT | -3 | 199005190_PIT_ATL |
| Oil Can Boyd | WAS | -2.12 | 199005180_WAS_SFN |
| Bruce Ruffin | PHI | -1.81 | 199005180_PHI_LAN |
Based on accumulated WAA for this season up to 1990-05-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3 | Frank Viola | 59.7 | NYN |
| +004+ | 2.89 | Bud Black | 59 | CLE |
| +006+ | 2.76 | Bob Welch | 58 | OAK |
| +007+ | 2.63 | Jack Armstrong | 53.3 | CIN |
| +008+ | 2.25 | Dave Stewart | 59.3 | OAK |
| +014+ | 1.92 | Chuck Finley | 47.3 | ANA |
| +016+ | 1.85 | Dennis Cook | 53 | PHI |
| +017+ | 1.84 | Tom Glavine | 56.3 | ATL |
| +020+ | 1.77 | Chris Bosio | 54.3 | MIL |
| +021+ | 1.74 | Mark Gardner | 40.3 | WAS |
| +022+ | 1.74 | Ed Whitson | 54 | SDN |
| +026+ | 1.65 | Dennis Martinez | 58 | WAS |
| +029+ | 1.6 | Doug Drabek | 45.7 | PIT |
| +031+ | 1.55 | Teddy Higuera | 40.3 | MIL |
| +034+ | 1.52 | Mike Witt | 26.3 | TOT |
| +035+ | 1.51 | Bryn Smith | 56.3 | SLN |
| +037+ | 1.48 | Neal Heaton | 44.3 | PIT |
| +039+ | 1.46 | Mike Morgan | 50.7 | LAN |
| +041+ | 1.42 | Bill Wegman | 20.3 | MIL |
| +045+ | 1.33 | Bob Walk | 40.3 | PIT |
| +051+ | 1.26 | Tom Gordon | 35.3 | KCA |
| XXXXX | 1.24 | Kevin Tapani | 48.3 | MIN |
| XXXXX | 1.2 | Les Lancaster | 34 | CHN |
| XXXXX | 1.18 | Dan Petry | 38.7 | DET |
| XXXXX | 1.15 | Scott Sanderson | 42 | OAK |
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