| 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 |
| John Cerutti | TOR | 3.55 | 198908070_TEX_TOR |
| Chris Bosio | MIL | 3.49 | 198908071_MIL_DET |
| 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 |
| Jim Clancy | HOU | -1.97 | 198908080_HOU_SDN |
| Wes Gardner | BOS | -1.9 | 198908070_BOS_KCA |
Based on accumulated WAA for this season up to 1989-08-09.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 5.45 | Bert Blyleven | 172.3 | ANA |
| +006+ | 5.36 | Chris Bosio | 181.3 | MIL |
| +007+ | 5.35 | Orel Hershiser | 184 | LAN |
| +008+ | 4.97 | John Cerutti | 154.3 | TOR |
| +009+ | 4.75 | Chuck Finley | 159.3 | ANA |
| +011+ | 4.66 | Mike Moore | 165.3 | OAK |
| +012+ | 4.66 | Mark Langston | 183.3 | TOT |
| +018+ | 4.38 | John Smoltz | 176.3 | ATL |
| +021+ | 4.21 | Bryn Smith | 157.7 | WAS |
| +024+ | 4.13 | Bret Saberhagen | 166.7 | KCA |
| +025+ | 4.04 | Scott Garrelts | 134.3 | SFN |
| +027+ | 3.96 | Ed Whitson | 170.3 | SDN |
| +030+ | 3.79 | Greg Swindell | 153.3 | CLE |
| +032+ | 3.6 | Mike Scott | 166.7 | HOU |
| +033+ | 3.6 | John Smiley | 164.7 | PIT |
| +040+ | 3.5 | Mike Morgan | 135 | LAN |
| +042+ | 3.45 | Greg Maddux | 162 | CHN |
| +043+ | 3.41 | Sid Fernandez | 141.7 | NYN |
| +044+ | 3.37 | Kevin Brown | 162.7 | TEX |
| +046+ | 3.33 | Mike Bielecki | 148.3 | CHN |
| +050+ | 3.03 | Kirk McCaskill | 144.3 | ANA |
| +054+ | 2.93 | Bruce Hurst | 180.3 | SDN |
| +057+ | 2.91 | Dennis Martinez | 172 | WAS |
| +058+ | 2.85 | Tom Candiotti | 142.7 | CLE |
| +060+ | 2.72 | Doug Drabek | 171.7 | PIT |
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