| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.13 | 198907280_LAN_SDN |
| Rick Reuschel | SFN | 6.85 | 198907290_SFN_HOU |
| John Smoltz | ATL | 4.34 | 198907290_CIN_ATL |
| Bert Blyleven | ANA | 3.51 | 198907280_CHA_ANA |
| Mark Gubicza | KCA | 3.4 | 198907280_BAL_KCA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -2.96 | 198907290_MIL_TEX |
| Mike Smithson | BOS | -2.87 | 198907290_BOS_CLE |
| Melido Perez | CHA | -2.56 | 198907270_CHA_ANA |
| Dave Schmidt | BAL | -2.35 | 198907290_BAL_KCA |
| Storm Davis | OAK | -2.27 | 198907290_SEA_OAK |
Based on accumulated WAA for this season up to 1989-07-29.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.72 | John Smoltz | 165 | ATL |
| +004+ | 5.41 | Bryn Smith | 141.7 | WAS |
| +006+ | 5.16 | Mike Moore | 151.3 | OAK |
| +008+ | 5.04 | Orel Hershiser | 168 | LAN |
| +009+ | 4.72 | Chuck Finley | 147 | ANA |
| +011+ | 4.51 | Bert Blyleven | 154.3 | ANA |
| +013+ | 4.46 | Rick Reuschel | 154 | SFN |
| +014+ | 4.24 | Mike Scott | 155.3 | HOU |
| +015+ | 4.19 | Ed Whitson | 153.3 | SDN |
| +018+ | 4.14 | Chris Bosio | 165 | MIL |
| +019+ | 4.05 | Mark Langston | 168.3 | TOT |
| +021+ | 3.98 | Scott Garrelts | 129 | SFN |
| +023+ | 3.75 | Greg Swindell | 153.3 | CLE |
| +026+ | 3.63 | John Cerutti | 136.3 | TOR |
| +031+ | 3.36 | Bret Saberhagen | 150.7 | KCA |
| +037+ | 3.22 | Mike Morgan | 129.3 | LAN |
| +038+ | 3.22 | Mike Bielecki | 126.7 | CHN |
| +041+ | 3.19 | Doug Drabek | 148 | PIT |
| +040+ | 3.19 | Mark Gubicza | 187.7 | KCA |
| +046+ | 2.97 | John Smiley | 150.3 | PIT |
| +047+ | 2.95 | Kevin Brown | 146.3 | TEX |
| +052+ | 2.7 | Bruce Hurst | 165.3 | SDN |
| +053+ | 2.65 | Greg Maddux | 146.7 | CHN |
| +059+ | 2.47 | Todd Burns | 72 | OAK |
| +064+ | 2.4 | Dennis Martinez | 158 | WAS |
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