| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bret Saberhagen | KCA | 5.92 | 198909040_KCA_DET |
| Mike Moore | OAK | 4.86 | 198909040_BOS_OAK |
| Scott Garrelts | SFN | 4.45 | 198909060_SFN_ATL |
| Chris Bosio | MIL | 4.42 | 198909060_MIL_ANA |
| Ed Whitson | SDN | 3.54 | 198909040_SDN_ATL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Charlie Leibrandt | KCA | -2.86 | 198909060_KCA_DET |
| Walt Terrell | NYA | -2.64 | 198909060_NYA_SEA |
| David West | MIN | -2.43 | 198909060_MIN_TEX |
| Steve Rosenberg | CHA | -1.55 | 198909050_TOR_CHA |
| Doyle Alexander | DET | -1.52 | 198909040_KCA_DET |
Based on accumulated WAA for this season up to 1989-09-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 6.63 | Orel Hershiser | 219 | LAN |
| +007+ | 6.3 | Bret Saberhagen | 215 | KCA |
| +008+ | 5.87 | Scott Garrelts | 164.7 | SFN |
| +012+ | 5.51 | Chris Bosio | 226 | MIL |
| +015+ | 5.3 | Mike Moore | 208 | OAK |
| +017+ | 5.13 | Chuck Finley | 176.3 | ANA |
| +018+ | 5.12 | Mark Gubicza | 237.7 | KCA |
| +021+ | 4.81 | Bert Blyleven | 204 | ANA |
| +025+ | 4.57 | Rick Reuschel | 176.3 | SFN |
| +030+ | 4.43 | Ed Whitson | 201.7 | SDN |
| +031+ | 4.37 | Mark Langston | 224.3 | TOT |
| +033+ | 4.29 | Bryn Smith | 186 | WAS |
| +035+ | 4.15 | Joe Magrane | 205.3 | SLN |
| +037+ | 4.12 | Doug Drabek | 212 | PIT |
| +036+ | 4.12 | Sid Fernandez | 183 | NYN |
| +039+ | 3.96 | Bob Welch | 183 | OAK |
| +042+ | 3.78 | John Smoltz | 209.7 | ATL |
| +044+ | 3.66 | Bruce Hurst | 207.3 | SDN |
| +047+ | 3.64 | John Cerutti | 180 | TOR |
| +050+ | 3.57 | Mike Morgan | 148.3 | LAN |
| +053+ | 3.45 | Tom Browning | 222.7 | CIN |
| +057+ | 3.34 | Greg Maddux | 209.3 | CHN |
| +059+ | 3.24 | Kirk McCaskill | 176.3 | ANA |
| +061+ | 3.22 | Jose DeLeon | 214 | SLN |
| +062+ | 3.2 | Dennis Martinez | 207.7 | WAS |
_