| Starter | Tm | Tier | Game |
|---|---|---|---|
| Doug Drabek | PIT | 4.85 | 199005260_SFN_PIT |
| Dennis Martinez | WAS | 4.34 | 199005250_CIN_WAS |
| Chris Bosio | MIL | 4.21 | 199005250_MIL_ANA |
| Bob Welch | OAK | 3.53 | 199005260_CLE_OAK |
| Sid Fernandez | NYN | 2.93 | 199005260_SDN_NYN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -4.96 | 199005270_CHA_DET |
| Andy Hawkins | NYA | -2.62 | 199005260_NYA_KCA |
| Bobby Witt | TEX | -2.23 | 199005270_BAL_TEX |
| Todd Stottlemyre | TOR | -2.2 | 199005260_TOR_SEA |
| Walt Terrell | PIT | -2.14 | 199005250_SFN_PIT |
Based on accumulated WAA for this season up to 1990-05-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 3.36 | Jack Armstrong | 61.3 | CIN |
| +004+ | 3.35 | Bob Welch | 72.7 | OAK |
| +008+ | 3 | Dave Stewart | 66.3 | OAK |
| +009+ | 2.83 | Bud Black | 66.3 | CLE |
| +011+ | 2.57 | Frank Viola | 63 | NYN |
| +012+ | 2.45 | Chris Bosio | 72.3 | MIL |
| +013+ | 2.28 | Tom Glavine | 62.3 | ATL |
| +014+ | 2.24 | Chuck Finley | 62.3 | ANA |
| +015+ | 2.23 | Dennis Martinez | 73 | WAS |
| +018+ | 2.16 | Teddy Higuera | 46.3 | MIL |
| +025+ | 1.94 | Mark Gardner | 51.3 | WAS |
| +026+ | 1.92 | Tim Leary | 59.7 | NYA |
| +028+ | 1.9 | Roger Clemens | 73 | BOS |
| +032+ | 1.82 | Dennis Cook | 58.7 | PHI |
| +033+ | 1.82 | Doug Drabek | 61 | PIT |
| +034+ | 1.79 | Tom Browning | 67.3 | CIN |
| +035+ | 1.78 | Dan Petry | 51.7 | DET |
| +036+ | 1.77 | Greg Hibbard | 52 | CHA |
| +037+ | 1.67 | Bob Walk | 45.7 | PIT |
| +043+ | 1.54 | Sid Fernandez | 56.3 | NYN |
| +054+ | 1.4 | Ed Whitson | 65 | SDN |
| +056+ | 1.37 | Willie Blair | 24.3 | TOR |
| +065+ | 1.34 | Mike Witt | 33.3 | TOT |
| +064+ | 1.34 | Dave Stieb | 54 | TOR |
| +066+ | 1.33 | Neal Heaton | 55.7 | PIT |
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