| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.08 | 198909130_HOU_LAN |
| Bret Saberhagen | KCA | 6.71 | 198909130_TEX_KCA |
| Mike Moore | OAK | 5.53 | 198909150_OAK_BOS |
| Bert Blyleven | ANA | 3.87 | 198909130_NYA_ANA |
| Ed Whitson | SDN | 3.46 | 198909140_ATL_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -3.68 | 198909151_ANA_CHA |
| Bob Knepper | SFN | -2.63 | 198909150_SDN_SFN |
| Andy Hawkins | NYA | -2.14 | 198909150_SEA_NYA |
| Pete Smith | ATL | -2.08 | 198909130_ATL_SDN |
| Jack Morris | DET | -2.04 | 198909130_DET_CLE |
Based on accumulated WAA for this season up to 1989-09-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 7.33 | Bret Saberhagen | 232 | KCA |
| +005+ | 7.09 | Orel Hershiser | 234 | LAN |
| +009+ | 6.06 | Scott Garrelts | 172.7 | SFN |
| +013+ | 5.53 | Mike Moore | 220.7 | OAK |
| +015+ | 5.42 | Mark Gubicza | 248.7 | KCA |
| +019+ | 5.26 | Chuck Finley | 181.3 | ANA |
| +020+ | 5.19 | John Smiley | 196 | PIT |
| +021+ | 5.1 | Ed Whitson | 212 | SDN |
| +022+ | 5 | Bert Blyleven | 217 | ANA |
| +023+ | 4.81 | Chris Bosio | 228 | MIL |
| +030+ | 4.52 | Bruce Hurst | 222.3 | SDN |
| +032+ | 4.47 | Rick Reuschel | 188.3 | SFN |
| +033+ | 4.47 | Bryn Smith | 197.7 | WAS |
| +034+ | 4.37 | Mark Langston | 231.7 | TOT |
| +037+ | 4.07 | Sid Fernandez | 190.3 | NYN |
| +040+ | 3.99 | Jose DeLeon | 226 | SLN |
| +043+ | 3.81 | John Smoltz | 209.7 | ATL |
| +046+ | 3.73 | John Cerutti | 191.7 | TOR |
| +049+ | 3.67 | Mike Morgan | 149.3 | LAN |
| +051+ | 3.54 | Kirk McCaskill | 183.3 | ANA |
| +055+ | 3.41 | Joe Magrane | 214.3 | SLN |
| +057+ | 3.36 | Doug Drabek | 221.7 | PIT |
| +059+ | 3.31 | Greg Maddux | 216.7 | CHN |
| +062+ | 3.21 | Bob Welch | 186.7 | OAK |
| +064+ | 3.18 | Todd Burns | 89.7 | OAK |
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