| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bert Blyleven | ANA | 6.4 | 198908291_ANA_BOS |
| Mike Moore | OAK | 6.06 | 198908300_OAK_NYA |
| Bret Saberhagen | KCA | 5.04 | 198908310_DET_KCA |
| Ed Whitson | SDN | 3.71 | 198908300_WAS_SDN |
| Joe Magrane | SLN | 2.66 | 198908290_CIN_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -4.68 | 198908290_CHA_TOR |
| Bobby Witt | TEX | -4.18 | 198908310_TEX_MIN |
| Don Carman | PHI | -2.45 | 198908310_PHI_SDN |
| David West | MIN | -2.4 | 198908310_TEX_MIN |
| Storm Davis | OAK | -1.34 | 198908290_OAK_NYA |
Based on accumulated WAA for this season up to 1989-08-31.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 6.51 | Orel Hershiser | 214 | LAN |
| +006+ | 6.21 | Bret Saberhagen | 207.7 | KCA |
| +008+ | 5.71 | Mike Moore | 201.3 | OAK |
| +010+ | 5.54 | Chris Bosio | 210.3 | MIL |
| +015+ | 5.07 | Bert Blyleven | 198.7 | ANA |
| +016+ | 5.02 | Chuck Finley | 176.3 | ANA |
| +019+ | 4.69 | John Smiley | 187.7 | PIT |
| +020+ | 4.69 | Ed Whitson | 198 | SDN |
| +022+ | 4.6 | Mark Gubicza | 232.7 | KCA |
| +025+ | 4.55 | Scott Garrelts | 147.7 | SFN |
| +027+ | 4.34 | Bryn Smith | 180.3 | WAS |
| +029+ | 4.2 | Joe Magrane | 199.3 | SLN |
| +032+ | 4.02 | Rick Reuschel | 168.3 | SFN |
| +033+ | 4 | Mark Langston | 211.3 | TOT |
| +035+ | 3.93 | Greg Maddux | 198 | CHN |
| +037+ | 3.79 | Bob Welch | 172 | OAK |
| +038+ | 3.67 | Sid Fernandez | 174 | NYN |
| +042+ | 3.61 | Tom Candiotti | 170.7 | CLE |
| +043+ | 3.58 | Doug Drabek | 204.3 | PIT |
| +046+ | 3.47 | Mike Morgan | 145.7 | LAN |
| +047+ | 3.45 | John Cerutti | 173.7 | TOR |
| +050+ | 3.42 | John Smoltz | 203.7 | ATL |
| +051+ | 3.41 | Dennis Martinez | 201.7 | WAS |
| +055+ | 3.33 | Bruce Hurst | 199.3 | SDN |
| +059+ | 3.27 | Kirk McCaskill | 170.7 | ANA |
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