| 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 |
| Mark Langston | ANA | 2.72 | 199005300_CLE_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Morris | DET | -4.49 | 199006010_DET_SEA |
| Walt Terrell | PIT | -2.68 | 199005300_LAN_PIT |
| Bobby Witt | TEX | -2.58 | 199006010_ANA_TEX |
| Todd Stottlemyre | TOR | -2.49 | 199006010_MIL_TOR |
| Storm Davis | KCA | -1.95 | 199005300_DET_KCA |
Based on accumulated WAA for this season up to 1990-06-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 3.83 | Jack Armstrong | 69.7 | CIN |
| +005+ | 3.52 | Dave Stewart | 75.3 | OAK |
| +006+ | 3.48 | Bud Black | 74.3 | CLE |
| +009+ | 3.24 | Frank Viola | 71 | NYN |
| +010+ | 3.16 | Bob Welch | 78.3 | OAK |
| +011+ | 2.71 | Chris Bosio | 80.3 | MIL |
| +013+ | 2.47 | Teddy Higuera | 52.3 | MIL |
| +018+ | 2.33 | Roger Clemens | 81 | BOS |
| +020+ | 2.23 | Tom Browning | 75.3 | CIN |
| +021+ | 2.2 | Tim Leary | 67.7 | NYA |
| +023+ | 2.17 | Chuck Finley | 62.3 | ANA |
| +025+ | 2.11 | Dave Stieb | 63 | TOR |
| +029+ | 1.95 | Greg Hibbard | 59.3 | CHA |
| +033+ | 1.89 | Mark Gardner | 51.3 | WAS |
| +037+ | 1.76 | Doug Drabek | 68 | PIT |
| +047+ | 1.64 | Dan Petry | 59.7 | DET |
| +050+ | 1.61 | John Tudor | 55 | SLN |
| +051+ | 1.6 | Bret Saberhagen | 71.7 | KCA |
| +053+ | 1.57 | Eric King | 55 | CHA |
| +055+ | 1.55 | Dennis Cook | 65.7 | PHI |
| +057+ | 1.5 | Sid Fernandez | 56.3 | NYN |
| +064+ | 1.38 | Tom Glavine | 67 | ATL |
| +065+ | 1.38 | Bobby Ojeda | 38.7 | NYN |
| +072+ | 1.35 | Mike Morgan | 70 | LAN |
| +074+ | 1.32 | Ed Whitson | 65 | SDN |
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