| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.08 | 198909130_HOU_LAN |
| Bret Saberhagen | KCA | 6.71 | 198909130_TEX_KCA |
| Scott Garrelts | SFN | 5.06 | 198909110_ATL_SFN |
| Chris Bosio | MIL | 4.02 | 198909120_MIL_OAK |
| Bert Blyleven | ANA | 3.87 | 198909130_NYA_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | NYA | -2.46 | 198909120_NYA_ANA |
| David West | MIN | -2.35 | 198909120_TOR_MIN |
| Bob Walk | PIT | -2.14 | 198909120_PIT_SLN |
| Jim Clancy | HOU | -2.09 | 198909120_HOU_SDN |
| Pete Smith | ATL | -2.08 | 198909130_ATL_SDN |
Based on accumulated WAA for this season up to 1989-09-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 7.35 | Bret Saberhagen | 232 | KCA |
| +005+ | 7.11 | Orel Hershiser | 234 | LAN |
| +008+ | 6.12 | Scott Garrelts | 172.7 | SFN |
| +009+ | 6.07 | Mike Moore | 217 | OAK |
| +015+ | 5.43 | Mark Gubicza | 248.7 | KCA |
| +019+ | 5.21 | John Smiley | 196 | PIT |
| +020+ | 5.05 | Chuck Finley | 176.3 | ANA |
| +021+ | 5.01 | Bert Blyleven | 217 | ANA |
| +022+ | 4.92 | Ed Whitson | 209.7 | SDN |
| +023+ | 4.84 | Chris Bosio | 228 | MIL |
| +028+ | 4.55 | Bruce Hurst | 222.3 | SDN |
| +029+ | 4.53 | Rick Reuschel | 188.3 | SFN |
| +032+ | 4.49 | Bryn Smith | 197.7 | WAS |
| +035+ | 4.39 | Mark Langston | 231.7 | TOT |
| +037+ | 4.1 | Sid Fernandez | 190.3 | NYN |
| +039+ | 4 | Jose DeLeon | 226 | SLN |
| +042+ | 3.82 | John Smoltz | 209.7 | ATL |
| +043+ | 3.74 | John Cerutti | 191.7 | TOR |
| +044+ | 3.68 | Mike Morgan | 149.3 | LAN |
| +051+ | 3.57 | Dennis Martinez | 214 | WAS |
| +052+ | 3.55 | Kirk McCaskill | 183.3 | ANA |
| +056+ | 3.41 | Joe Magrane | 214.3 | SLN |
| +059+ | 3.38 | Doug Drabek | 221.7 | PIT |
| +061+ | 3.33 | Greg Maddux | 216.7 | CHN |
| +063+ | 3.22 | Bob Welch | 186.7 | OAK |
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