| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bret Saberhagen | KCA | 10.46 | 198909300_KCA_OAK |
| Orel Hershiser | LAN | 6.94 | 198910010_LAN_ATL |
| Mark Langston | WAS | 3.31 | 198909290_WAS_PHI |
| Chuck Finley | ANA | 3.27 | 198909300_TEX_ANA |
| Rick Reuschel | SFN | 3.07 | 198909300_SFN_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -6 | 198909290_TEX_ANA |
| Andy Hawkins | NYA | -2.91 | 198909300_DET_NYA |
| Mike Witt | ANA | -1.94 | 198909290_TEX_ANA |
| Jack Morris | DET | -1.88 | 198909290_DET_NYA |
| Jeff Robinson | PIT | -0.99 | 198909292_NYN_PIT |
Based on accumulated WAA for this season up to 1989-10-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 9.66 | Bret Saberhagen | 263 | KCA |
| +004+ | 7.83 | Orel Hershiser | 257 | LAN |
| +009+ | 6.35 | Scott Garrelts | 193.7 | SFN |
| +011+ | 6.18 | Mike Moore | 242 | OAK |
| +017+ | 5.68 | Bruce Hurst | 245.3 | SDN |
| +019+ | 5.55 | Mark Langston | 251.3 | TOT |
| +020+ | 5.4 | Bert Blyleven | 241 | ANA |
| +021+ | 5.39 | Chuck Finley | 199.3 | ANA |
| +022+ | 5.37 | Ed Whitson | 227 | SDN |
| +032+ | 4.64 | Chris Bosio | 235 | MIL |
| +033+ | 4.63 | Doug Drabek | 245.3 | PIT |
| +035+ | 4.35 | Sid Fernandez | 219 | NYN |
| +036+ | 4.32 | Tim Belcher | 230.3 | LAN |
| +039+ | 4.17 | Joe Magrane | 234.7 | SLN |
| +043+ | 4.02 | Greg Maddux | 238.3 | CHN |
| +046+ | 3.99 | Mark Gubicza | 255.7 | KCA |
| +047+ | 3.98 | Bryn Smith | 214.7 | WAS |
| +051+ | 3.83 | Mike Morgan | 152.3 | LAN |
| +052+ | 3.8 | John Smiley | 205.3 | PIT |
| +055+ | 3.77 | Kirk McCaskill | 212.3 | ANA |
| +056+ | 3.77 | Jim Deshaies | 226.3 | HOU |
| +065+ | 3.62 | Rick Reuschel | 208.3 | SFN |
| +068+ | 3.5 | Jose DeLeon | 244 | SLN |
| +070+ | 3.45 | Bob Welch | 210.3 | OAK |
| +071+ | 3.39 | Rick Aguilera | 144.7 | TOT |
_