| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Moore | OAK | 5.53 | 198909150_OAK_BOS |
| Mark Gubicza | KCA | 4.21 | 198909160_KCA_BAL |
| John Smiley | PIT | 4.12 | 198909160_CHN_PIT |
| Chuck Finley | ANA | 3.84 | 198909152_ANA_CHA |
| 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 |
| Randy Johnson | SEA | -1.9 | 198909160_SEA_NYA |
| Jerry Reuss | MIL | -1.44 | 198909160_TEX_MIL |
Based on accumulated WAA for this season up to 1989-09-16.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 7.34 | Bret Saberhagen | 232 | KCA |
| +005+ | 7.08 | Orel Hershiser | 234 | LAN |
| +009+ | 6.06 | Scott Garrelts | 172.7 | SFN |
| +014+ | 5.54 | Mike Moore | 220.7 | OAK |
| +018+ | 5.26 | Chuck Finley | 181.3 | ANA |
| +019+ | 5.09 | Ed Whitson | 212 | SDN |
| +020+ | 5 | Bert Blyleven | 217 | ANA |
| +021+ | 4.9 | Mark Gubicza | 254.7 | KCA |
| +022+ | 4.8 | Chris Bosio | 228 | MIL |
| +023+ | 4.77 | John Smiley | 201 | PIT |
| +030+ | 4.51 | Bruce Hurst | 222.3 | SDN |
| +032+ | 4.46 | Bryn Smith | 197.7 | WAS |
| +031+ | 4.46 | Rick Reuschel | 188.3 | SFN |
| +033+ | 4.37 | Mark Langston | 231.7 | TOT |
| +039+ | 3.98 | Jose DeLeon | 226 | SLN |
| +041+ | 3.82 | Kirk McCaskill | 191.3 | ANA |
| +042+ | 3.81 | John Smoltz | 209.7 | ATL |
| +046+ | 3.7 | John Cerutti | 191.7 | TOR |
| +048+ | 3.66 | Mike Morgan | 149.3 | LAN |
| +055+ | 3.4 | Joe Magrane | 214.3 | SLN |
| +056+ | 3.36 | Doug Drabek | 221.7 | PIT |
| +057+ | 3.35 | Todd Burns | 91.7 | OAK |
| +062+ | 3.27 | Greg Maddux | 221 | CHN |
| +064+ | 3.21 | Bob Welch | 186.7 | OAK |
| +065+ | 3.14 | Tim Belcher | 212.3 | LAN |
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