| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 6.68 | 198908080_ATL_LAN |
| Bert Blyleven | ANA | 4.89 | 198908080_SEA_ANA |
| John Smoltz | ATL | 3.58 | 198908080_ATL_LAN |
| Bryn Smith | WAS | 3.43 | 198908090_WAS_CHN |
| Sid Fernandez | NYN | 2.92 | 198908102_SLN_NYN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| 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 | -2.56 | 198908100_OAK_CHA |
| Jim Clancy | HOU | -1.97 | 198908080_HOU_SDN |
Based on accumulated WAA for this season up to 1989-08-10.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 5.47 | Bert Blyleven | 172.3 | ANA |
| +007+ | 5.39 | Orel Hershiser | 184 | LAN |
| +006+ | 5.39 | Chris Bosio | 181.3 | MIL |
| +008+ | 5 | John Cerutti | 154.3 | TOR |
| +009+ | 4.91 | Chuck Finley | 168.3 | ANA |
| +011+ | 4.7 | Mike Moore | 165.3 | OAK |
| +012+ | 4.68 | Mark Langston | 183.3 | TOT |
| +017+ | 4.41 | John Smoltz | 176.3 | ATL |
| +021+ | 4.24 | Bryn Smith | 157.7 | WAS |
| +022+ | 4.16 | Bret Saberhagen | 166.7 | KCA |
| +026+ | 3.99 | Ed Whitson | 170.3 | SDN |
| +028+ | 3.82 | Greg Swindell | 153.3 | CLE |
| +030+ | 3.65 | Mike Scott | 166.7 | HOU |
| +031+ | 3.63 | John Smiley | 164.7 | PIT |
| +038+ | 3.52 | Mike Morgan | 135 | LAN |
| +040+ | 3.49 | Greg Maddux | 162 | CHN |
| +041+ | 3.4 | Kevin Brown | 162.7 | TEX |
| +043+ | 3.36 | Mike Bielecki | 148.3 | CHN |
| +045+ | 3.24 | Sid Fernandez | 146.7 | NYN |
| +049+ | 3.05 | Kirk McCaskill | 144.3 | ANA |
| +053+ | 2.97 | Bruce Hurst | 180.3 | SDN |
| +055+ | 2.95 | Dennis Martinez | 172 | WAS |
| +057+ | 2.88 | Tom Candiotti | 142.7 | CLE |
| +061+ | 2.75 | Doug Drabek | 171.7 | PIT |
| +063+ | 2.71 | Chuck Cary | 67.3 | NYA |
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