| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 8.14 | 198907231_LAN_PIT |
| Mark Gubicza | KCA | 5.03 | 198907230_CLE_KCA |
| Mike Scott | HOU | 4.77 | 198907210_PHI_HOU |
| Mike Moore | OAK | 3.64 | 198907210_BAL_OAK |
| Bert Blyleven | ANA | 3.57 | 198907230_DET_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -3.65 | 198907210_CHA_BOS |
| Bobby Witt | TEX | -3.36 | 198907230_NYA_TEX |
| Storm Davis | OAK | -2.7 | 198907230_BAL_OAK |
| Bruce Ruffin | PHI | -2.33 | 198907230_PHI_HOU |
| Dave LaPoint | NYA | -2.09 | 198907220_NYA_TEX |
Based on accumulated WAA for this season up to 1989-07-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.5 | John Smoltz | 149 | ATL |
| +003+ | 5.46 | Mike Moore | 145 | OAK |
| +006+ | 5.03 | Bryn Smith | 134.7 | WAS |
| +007+ | 4.74 | Bert Blyleven | 147.7 | ANA |
| +009+ | 4.68 | Orel Hershiser | 160 | LAN |
| +012+ | 4.45 | Rick Reuschel | 145 | SFN |
| +013+ | 4.26 | Greg Swindell | 149.7 | CLE |
| +015+ | 4.02 | Chuck Finley | 139.3 | ANA |
| +017+ | 3.97 | Ed Whitson | 146.3 | SDN |
| +019+ | 3.74 | Mike Scott | 147.3 | HOU |
| +020+ | 3.66 | Mike Morgan | 123 | LAN |
| +022+ | 3.62 | Bret Saberhagen | 144 | KCA |
| +025+ | 3.4 | John Cerutti | 129.3 | TOR |
| +027+ | 3.32 | Scott Garrelts | 122 | SFN |
| +028+ | 3.31 | Chris Bosio | 152 | MIL |
| +029+ | 3.27 | Mark Langston | 159.3 | TOT |
| +035+ | 3.16 | Mark Gubicza | 180 | KCA |
| +038+ | 3.01 | Scott Bankhead | 133.3 | SEA |
| +042+ | 2.93 | Sid Fernandez | 121.7 | NYN |
| +049+ | 2.8 | Mike Bielecki | 119.7 | CHN |
| +050+ | 2.75 | Doug Drabek | 141 | PIT |
| +054+ | 2.64 | Todd Burns | 69 | OAK |
| +058+ | 2.57 | John Smiley | 141.3 | PIT |
| +059+ | 2.52 | Jim Deshaies | 140.3 | HOU |
| +062+ | 2.44 | Kevin Brown | 138.3 | TEX |
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