| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bret Saberhagen | KCA | 9.7 | 198909260_KCA_ANA |
| Scott Garrelts | SFN | 4.51 | 198909270_SFN_LAN |
| Mike Moore | OAK | 4.33 | 198909270_TEX_OAK |
| Ed Whitson | SDN | 4.19 | 198909250_CIN_SDN |
| Bryn Smith | WAS | 2.86 | 198909250_CHN_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Walt Terrell | NYA | -2.41 | 198909270_NYA_BOS |
| Melido Perez | CHA | -2.29 | 198909260_MIN_CHA |
| Jerry Reuss | MIL | -1.93 | 198909270_BAL_MIL |
| Randy Johnson | SEA | -1.56 | 198909270_CLE_SEA |
| Doyle Alexander | DET | -1.49 | 198909270_TOR_DET |
Based on accumulated WAA for this season up to 1989-09-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 9.24 | Bret Saberhagen | 255 | KCA |
| +006+ | 7.2 | Orel Hershiser | 246 | LAN |
| +009+ | 6.36 | Scott Garrelts | 193.7 | SFN |
| +010+ | 6.27 | Mike Moore | 242 | OAK |
| +013+ | 5.73 | Bruce Hurst | 245.3 | SDN |
| +017+ | 5.42 | Ed Whitson | 227 | SDN |
| +020+ | 5.2 | Mark Langston | 244.3 | TOT |
| +022+ | 5.12 | Chuck Finley | 193.3 | ANA |
| +025+ | 4.97 | Rick Reuschel | 204.3 | SFN |
| +029+ | 4.71 | Doug Drabek | 245.3 | PIT |
| +031+ | 4.69 | Bryn Smith | 210.7 | WAS |
| +032+ | 4.68 | Bert Blyleven | 232 | ANA |
| +033+ | 4.67 | Chris Bosio | 235 | MIL |
| +037+ | 4.41 | Tim Belcher | 230.3 | LAN |
| +041+ | 4.22 | Joe Magrane | 234.7 | SLN |
| +043+ | 4.15 | Sid Fernandez | 211 | NYN |
| +046+ | 4.06 | Greg Maddux | 238.3 | CHN |
| +048+ | 4.05 | Mark Gubicza | 255.7 | KCA |
| +047+ | 4.05 | Kirk McCaskill | 207.7 | ANA |
| +053+ | 3.88 | Mike Morgan | 152.3 | LAN |
| +054+ | 3.86 | John Smiley | 205.3 | PIT |
| +062+ | 3.67 | Jose DeLeon | 238 | SLN |
| +065+ | 3.45 | Rick Aguilera | 144.7 | TOT |
| +069+ | 3.3 | Bob Welch | 205.3 | OAK |
| +075+ | 3.1 | Todd Burns | 94 | OAK |
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