| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.13 | 198907280_LAN_SDN |
| Rick Reuschel | SFN | 6.85 | 198907290_SFN_HOU |
| Bryn Smith | WAS | 5.75 | 198907300_SLN_WAS |
| Mike Scott | HOU | 5.37 | 198907300_SFN_HOU |
| John Smoltz | ATL | 4.34 | 198907290_CIN_ATL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -2.96 | 198907290_MIL_TEX |
| Mike Smithson | BOS | -2.87 | 198907290_BOS_CLE |
| Jerry Reuss | CHA | -2.37 | 198907300_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 1989-07-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.76 | John Smoltz | 165 | ATL |
| +004+ | 5.33 | Bryn Smith | 147.7 | WAS |
| +006+ | 5.2 | Mike Moore | 151.3 | OAK |
| +008+ | 5.08 | Orel Hershiser | 168 | LAN |
| +009+ | 4.76 | Chuck Finley | 154.3 | ANA |
| +011+ | 4.55 | Bert Blyleven | 154.3 | ANA |
| +012+ | 4.51 | Rick Reuschel | 154 | SFN |
| +014+ | 4.45 | Mike Scott | 162.3 | HOU |
| +017+ | 4.19 | Chris Bosio | 165 | MIL |
| +019+ | 4.09 | Mark Langston | 168.3 | TOT |
| +020+ | 4.02 | Scott Garrelts | 129 | SFN |
| +022+ | 3.79 | Greg Swindell | 153.3 | CLE |
| +025+ | 3.68 | John Cerutti | 136.3 | TOR |
| +031+ | 3.39 | Bret Saberhagen | 150.7 | KCA |
| +032+ | 3.35 | Ed Whitson | 155.3 | SDN |
| +036+ | 3.25 | Mike Morgan | 129.3 | LAN |
| +037+ | 3.23 | Mark Gubicza | 187.7 | KCA |
| +042+ | 3.02 | John Smiley | 150.3 | PIT |
| +045+ | 2.99 | Kevin Brown | 146.3 | TEX |
| +044+ | 2.99 | Mike Bielecki | 133.3 | CHN |
| +050+ | 2.74 | Bruce Hurst | 165.3 | SDN |
| +051+ | 2.68 | Greg Maddux | 146.7 | CHN |
| +053+ | 2.65 | Doug Drabek | 153.3 | PIT |
| +059+ | 2.49 | Todd Burns | 72 | OAK |
| +063+ | 2.44 | Dennis Martinez | 158 | WAS |
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