| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Reuschel | SFN | 8.13 | 198906210_HOU_SFN |
| Roger Clemens | BOS | 7.84 | 198906210_TEX_BOS |
| Mark Gubicza | KCA | 6.08 | 198906230_NYA_KCA |
| Doug Drabek | PIT | 3.54 | 198906210_CHN_PIT |
| Bryn Smith | WAS | 2.33 | 198906210_WAS_NYN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -5.59 | 198906210_TEX_BOS |
| Melido Perez | CHA | -4.97 | 198906232_CHA_MIL |
| Mike Smithson | BOS | -1.88 | 198906220_TEX_BOS |
| Andy Hawkins | NYA | -1.51 | 198906210_CHA_NYA |
| Mike Witt | ANA | -1.16 | 198906230_BAL_ANA |
Based on accumulated WAA for this season up to 1989-06-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 4.43 | Rick Reuschel | 119 | SFN |
| +004+ | 4.21 | Mike Morgan | 93.3 | LAN |
| +006+ | 4.11 | Mark Gubicza | 139.3 | KCA |
| +007+ | 4 | Mike Moore | 109.3 | OAK |
| +008+ | 3.8 | John Smoltz | 110.7 | ATL |
| +013+ | 3.35 | Greg Swindell | 112.3 | CLE |
| +014+ | 3.34 | Scott Garrelts | 103.7 | SFN |
| +015+ | 3.33 | Bryn Smith | 99.3 | WAS |
| +016+ | 3.28 | Mike Scott | 114.3 | HOU |
| +017+ | 3.19 | Bert Blyleven | 103 | ANA |
| +018+ | 3.04 | Doug Drabek | 103.7 | PIT |
| +019+ | 3.03 | Orel Hershiser | 112 | LAN |
| +022+ | 2.91 | Chuck Finley | 97.3 | ANA |
| +026+ | 2.81 | Bret Saberhagen | 109.3 | KCA |
| +028+ | 2.74 | Dwight Gooden | 106 | NYN |
| +030+ | 2.69 | Todd Burns | 55.3 | OAK |
| +033+ | 2.66 | Ed Whitson | 109.3 | SDN |
| +045+ | 2.34 | John Cerutti | 96.3 | TOR |
| +047+ | 2.31 | Chris Bosio | 113.3 | MIL |
| +052+ | 2.18 | Mike Bielecki | 86.7 | CHN |
| +056+ | 2.14 | Jose Rijo | 98 | CIN |
| +059+ | 2.06 | Don Robinson | 96 | SFN |
| +060+ | 2.02 | Dennis Martinez | 111 | WAS |
| +062+ | 1.98 | Bob Welch | 93.3 | OAK |
| +063+ | 1.96 | Roger Clemens | 117 | BOS |
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