| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 6.68 | 198908080_ATL_LAN |
| Bert Blyleven | ANA | 4.89 | 198908080_SEA_ANA |
| Bret Saberhagen | KCA | 3.77 | 198908060_KCA_MIN |
| John Smoltz | ATL | 3.58 | 198908080_ATL_LAN |
| John Cerutti | TOR | 3.55 | 198908070_TEX_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Knepper | SFN | -6.2 | 198908060_HOU_SFN |
| Bobby Witt | TEX | -3.86 | 198908080_TEX_TOR |
| Melido Perez | CHA | -3.65 | 198908080_OAK_CHA |
| Don August | MIL | -3.59 | 198908080_MIL_DET |
| Storm Davis | OAK | -3.35 | 198908060_OAK_SEA |
Based on accumulated WAA for this season up to 1989-08-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 5.47 | Bert Blyleven | 172.3 | ANA |
| +006+ | 5.39 | Chris Bosio | 181.3 | MIL |
| +007+ | 5.37 | Orel Hershiser | 184 | LAN |
| +008+ | 4.99 | John Cerutti | 154.3 | TOR |
| +010+ | 4.77 | Chuck Finley | 159.3 | ANA |
| +011+ | 4.71 | Mike Moore | 165.3 | OAK |
| +013+ | 4.66 | Mark Langston | 183.3 | TOT |
| +016+ | 4.4 | John Smoltz | 176.3 | ATL |
| +019+ | 4.25 | Bryn Smith | 150.7 | WAS |
| +022+ | 4.15 | Bret Saberhagen | 166.7 | KCA |
| +026+ | 4.06 | Scott Garrelts | 134.3 | SFN |
| +028+ | 3.81 | Greg Swindell | 153.3 | CLE |
| +029+ | 3.62 | John Smiley | 164.7 | PIT |
| +030+ | 3.61 | Mike Scott | 166.7 | HOU |
| +036+ | 3.5 | Ed Whitson | 162.3 | SDN |
| +038+ | 3.47 | Greg Maddux | 162 | CHN |
| +039+ | 3.43 | Sid Fernandez | 141.7 | NYN |
| +041+ | 3.39 | Kevin Brown | 162.7 | TEX |
| +044+ | 3.34 | Mike Morgan | 133 | LAN |
| +045+ | 3.34 | Mike Bielecki | 148.3 | CHN |
| +051+ | 2.96 | Bruce Hurst | 180.3 | SDN |
| +054+ | 2.92 | Dennis Martinez | 172 | WAS |
| +055+ | 2.87 | Tom Candiotti | 142.7 | CLE |
| +058+ | 2.71 | Chuck Cary | 67.3 | NYA |
| +060+ | 2.69 | Doug Drabek | 163.7 | PIT |
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