| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bret Saberhagen | KCA | 9.7 | 198909260_KCA_ANA |
| Orel Hershiser | LAN | 6.29 | 198909240_SDN_LAN |
| Ed Whitson | SDN | 4.19 | 198909250_CIN_SDN |
| Chuck Finley | ANA | 3.77 | 198909240_ANA_CLE |
| Bryn Smith | WAS | 2.86 | 198909250_CHN_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -2.29 | 198909260_MIN_CHA |
| Jim Clancy | HOU | -2.11 | 198909240_HOU_SFN |
| Jack Morris | DET | -1.85 | 198909240_BOS_DET |
| Andy Hawkins | NYA | -1.29 | 198909260_NYA_BOS |
| Dennis Rasmussen | SDN | -1.08 | 198909260_CIN_SDN |
Based on accumulated WAA for this season up to 1989-09-26.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 9.28 | Bret Saberhagen | 255 | KCA |
| +006+ | 7.24 | Orel Hershiser | 246 | LAN |
| +010+ | 5.99 | Scott Garrelts | 186.7 | SFN |
| +013+ | 5.7 | Mike Moore | 235 | OAK |
| +016+ | 5.51 | Ed Whitson | 227 | SDN |
| +019+ | 5.25 | Mark Langston | 244.3 | TOT |
| +020+ | 5.23 | Bruce Hurst | 238.3 | SDN |
| +021+ | 5.15 | Chuck Finley | 193.3 | ANA |
| +025+ | 4.99 | Rick Reuschel | 204.3 | SFN |
| +029+ | 4.73 | Bryn Smith | 210.7 | WAS |
| +031+ | 4.71 | Chris Bosio | 235 | MIL |
| +030+ | 4.71 | Bert Blyleven | 232 | ANA |
| +039+ | 4.19 | Sid Fernandez | 211 | NYN |
| +042+ | 4.1 | Greg Maddux | 238.3 | CHN |
| +043+ | 4.09 | Mark Gubicza | 255.7 | KCA |
| +044+ | 4.08 | Kirk McCaskill | 207.7 | ANA |
| +046+ | 3.98 | Doug Drabek | 236.3 | PIT |
| +050+ | 3.91 | Mike Morgan | 152.3 | LAN |
| +051+ | 3.89 | John Smiley | 205.3 | PIT |
| +052+ | 3.85 | Joe Magrane | 227.7 | SLN |
| +058+ | 3.69 | Jose DeLeon | 238 | SLN |
| +060+ | 3.68 | Tim Belcher | 221.3 | LAN |
| +063+ | 3.47 | Rick Aguilera | 144.7 | TOT |
| +066+ | 3.33 | Bob Welch | 205.3 | OAK |
| +072+ | 3.12 | Todd Burns | 94 | OAK |
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