| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Reuschel | SFN | 8.56 | 198907060_SFN_PIT |
| Mark Gubicza | KCA | 6.99 | 198907080_CHA_KCA |
| Roger Clemens | BOS | 5.41 | 198907070_NYA_BOS |
| Doug Drabek | PIT | 4.73 | 198907070_SDN_PIT |
| Bryn Smith | WAS | 3.69 | 198907080_WAS_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.97 | 198907070_TEX_OAK |
| Bill Swift | SEA | -2.84 | 198907060_MIN_SEA |
| Bruce Ruffin | PHI | -2.35 | 198907060_PHI_ATL |
| Storm Davis | OAK | -1.77 | 198907070_TEX_OAK |
| Danny Jackson | CIN | -1.57 | 198907060_CIN_NYN |
Based on accumulated WAA for this season up to 1989-07-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.05 | Rick Reuschel | 140 | SFN |
| +003+ | 5.01 | John Smoltz | 134 | ATL |
| +004+ | 4.8 | Mike Morgan | 115.3 | LAN |
| +008+ | 4.53 | Bert Blyleven | 125.7 | ANA |
| +009+ | 4.49 | Mike Moore | 130 | OAK |
| +011+ | 4.35 | Mark Gubicza | 161.3 | KCA |
| +012+ | 4.29 | Doug Drabek | 128 | PIT |
| +013+ | 4.21 | Chuck Finley | 124.3 | ANA |
| +014+ | 4.16 | Bryn Smith | 119.3 | WAS |
| +018+ | 3.54 | Orel Hershiser | 133 | LAN |
| +020+ | 3.51 | Ed Whitson | 129.3 | SDN |
| +021+ | 3.45 | Bret Saberhagen | 121.3 | KCA |
| +022+ | 3.37 | Mike Scott | 137.3 | HOU |
| +028+ | 3.01 | Greg Swindell | 133.7 | CLE |
| +029+ | 2.96 | Mike Bielecki | 100.3 | CHN |
| +030+ | 2.94 | Chris Bosio | 130 | MIL |
| +035+ | 2.71 | John Cerutti | 117.3 | TOR |
| +037+ | 2.67 | Dennis Martinez | 131.3 | WAS |
| +044+ | 2.55 | Mark Langston | 136.3 | TOT |
| +053+ | 2.45 | Nolan Ryan | 127 | TEX |
| +054+ | 2.43 | Kevin Brown | 124.3 | TEX |
| +059+ | 2.34 | Scott Garrelts | 108.3 | SFN |
| +058+ | 2.34 | Bruce Hurst | 135.3 | SDN |
| +060+ | 2.33 | Kirk McCaskill | 112.3 | ANA |
| +063+ | 2.26 | John Smiley | 126.3 | PIT |
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