| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bert Blyleven | ANA | 6.4 | 198908291_ANA_BOS |
| Orel Hershiser | LAN | 6.23 | 198908280_NYN_LAN |
| Mike Moore | OAK | 6.06 | 198908300_OAK_NYA |
| Rick Reuschel | SFN | 4.4 | 198908280_PHI_SFN |
| Ed Whitson | SDN | 3.71 | 198908300_WAS_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -4.68 | 198908290_CHA_TOR |
| Andy Hawkins | NYA | -1.86 | 198908280_OAK_NYA |
| Bruce Ruffin | PHI | -1.77 | 198908290_PHI_SFN |
| Mike Dunne | SEA | -1.67 | 198908280_SEA_MIN |
| Pete Smith | ATL | -1.48 | 198908280_ATL_PIT |
Based on accumulated WAA for this season up to 1989-08-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 6.51 | Orel Hershiser | 214 | LAN |
| +008+ | 5.71 | Mike Moore | 201.3 | OAK |
| +009+ | 5.54 | Chris Bosio | 210.3 | MIL |
| +010+ | 5.52 | Bret Saberhagen | 199.7 | KCA |
| +013+ | 5.06 | Bert Blyleven | 198.7 | ANA |
| +015+ | 5.01 | Chuck Finley | 176.3 | ANA |
| +019+ | 4.7 | John Smiley | 187.7 | PIT |
| +020+ | 4.69 | Ed Whitson | 198 | SDN |
| +022+ | 4.6 | Mark Gubicza | 232.7 | KCA |
| +024+ | 4.55 | Scott Garrelts | 147.7 | SFN |
| +027+ | 4.34 | Bryn Smith | 180.3 | WAS |
| +028+ | 4.2 | Joe Magrane | 199.3 | SLN |
| +031+ | 4.02 | Rick Reuschel | 168.3 | SFN |
| +032+ | 4 | Mark Langston | 211.3 | TOT |
| +034+ | 3.93 | Greg Maddux | 198 | CHN |
| +037+ | 3.8 | Bob Welch | 172 | OAK |
| +038+ | 3.67 | Sid Fernandez | 174 | NYN |
| +039+ | 3.67 | Kirk McCaskill | 165.7 | ANA |
| +042+ | 3.62 | Tom Candiotti | 170.7 | CLE |
| +043+ | 3.58 | Doug Drabek | 204.3 | PIT |
| +048+ | 3.48 | Mike Morgan | 145.7 | LAN |
| +049+ | 3.46 | John Cerutti | 173.7 | TOR |
| +052+ | 3.42 | Dennis Martinez | 201.7 | WAS |
| +050+ | 3.42 | John Smoltz | 203.7 | ATL |
| +054+ | 3.34 | Bruce Hurst | 199.3 | SDN |
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