| Starter | Tm | Tier | Game |
|---|---|---|---|
| Frank Viola | NYN | 4.58 | 199006010_NYN_PHI |
| Doug Drabek | PIT | 4.49 | 199006010_WAS_PIT |
| Ted Higuera | MIL | 4.21 | 199006010_MIL_TOR |
| Bob Welch | OAK | 3.41 | 199005310_OAK_KCA |
| Tim Belcher | LAN | 2.79 | 199006020_CIN_LAN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -4.49 | 199006010_DET_SEA |
| Bobby Witt | TEX | -2.58 | 199006010_ANA_TEX |
| Todd Stottlemyre | TOR | -2.49 | 199006010_MIL_TOR |
| David West | MIN | -1.86 | 199006020_MIN_CHA |
| Melido Perez | CHA | -1.47 | 199006010_MIN_CHA |
Based on accumulated WAA for this season up to 1990-06-02.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.84 | Jack Armstrong | 69.7 | CIN |
| +004+ | 3.54 | Dave Stewart | 75.3 | OAK |
| +007+ | 3.26 | Frank Viola | 71 | NYN |
| +008+ | 3.18 | Bob Welch | 78.3 | OAK |
| +011+ | 2.72 | Chris Bosio | 80.3 | MIL |
| +012+ | 2.67 | Bud Black | 77 | CLE |
| +014+ | 2.47 | Teddy Higuera | 52.3 | MIL |
| +017+ | 2.35 | Roger Clemens | 81 | BOS |
| +020+ | 2.23 | Tom Browning | 75.3 | CIN |
| +023+ | 2.14 | Ed Whitson | 74 | SDN |
| +025+ | 2.11 | Dave Stieb | 63 | TOR |
| +027+ | 2.05 | Eric King | 62.7 | CHA |
| +029+ | 2.03 | Tim Leary | 72.7 | NYA |
| +028+ | 2.03 | Bret Saberhagen | 78.7 | KCA |
| +030+ | 1.96 | Greg Hibbard | 59.3 | CHA |
| +035+ | 1.88 | Mark Gardner | 51.3 | WAS |
| +040+ | 1.75 | Doug Drabek | 68 | PIT |
| +045+ | 1.65 | Dan Petry | 59.7 | DET |
| +050+ | 1.61 | John Tudor | 55 | SLN |
| +054+ | 1.56 | Dennis Cook | 65.7 | PHI |
| +055+ | 1.53 | Neal Heaton | 63.3 | PIT |
| +057+ | 1.51 | Sid Fernandez | 56.3 | NYN |
| +065+ | 1.39 | Bobby Ojeda | 38.7 | NYN |
| +063+ | 1.39 | Tom Glavine | 67 | ATL |
| +068+ | 1.37 | Chuck Finley | 65 | ANA |
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