| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Moore | OAK | 6.06 | 198908300_OAK_NYA |
| Bret Saberhagen | KCA | 5.04 | 198908310_DET_KCA |
| Chris Bosio | MIL | 4.03 | 198909010_OAK_MIL |
| Ed Whitson | SDN | 3.71 | 198908300_WAS_SDN |
| Scott Garrelts | SFN | 3.29 | 198909010_NYN_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.18 | 198908310_TEX_MIN |
| Don Carman | PHI | -2.45 | 198908310_PHI_SDN |
| David West | MIN | -2.4 | 198908310_TEX_MIN |
| Walt Terrell | NYA | -2.03 | 198909010_ANA_NYA |
| Rich Dotson | CHA | -1.7 | 198908300_CHA_TOR |
Based on accumulated WAA for this season up to 1989-09-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 6.52 | Orel Hershiser | 214 | LAN |
| +006+ | 6.18 | Bret Saberhagen | 207.7 | KCA |
| +009+ | 5.71 | Mike Moore | 201.3 | OAK |
| +010+ | 5.54 | Chris Bosio | 217.7 | MIL |
| +013+ | 5.24 | Scott Garrelts | 155.7 | SFN |
| +015+ | 5.09 | Bert Blyleven | 198.7 | ANA |
| +019+ | 5.04 | Chuck Finley | 176.3 | ANA |
| +021+ | 4.7 | Ed Whitson | 198 | SDN |
| +020+ | 4.7 | John Smiley | 187.7 | PIT |
| +025+ | 4.56 | Mark Gubicza | 232.7 | KCA |
| +026+ | 4.36 | Bryn Smith | 180.3 | WAS |
| +029+ | 4.21 | Joe Magrane | 199.3 | SLN |
| +030+ | 4.19 | Mark Langston | 218.3 | TOT |
| +034+ | 4.03 | Rick Reuschel | 168.3 | SFN |
| +035+ | 3.95 | Greg Maddux | 198 | CHN |
| +040+ | 3.69 | Bob Welch | 178 | OAK |
| +039+ | 3.69 | Sid Fernandez | 174 | NYN |
| +043+ | 3.59 | Tom Candiotti | 170.7 | CLE |
| +042+ | 3.59 | Doug Drabek | 204.3 | PIT |
| +046+ | 3.48 | Mike Morgan | 145.7 | LAN |
| +048+ | 3.46 | John Cerutti | 173.7 | TOR |
| +049+ | 3.44 | Dennis Martinez | 201.7 | WAS |
| +051+ | 3.43 | John Smoltz | 203.7 | ATL |
| +055+ | 3.34 | Bruce Hurst | 199.3 | SDN |
| +057+ | 3.29 | Kirk McCaskill | 170.7 | ANA |
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