| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 5.66 | 198908230_LAN_WAS |
| Mike Moore | OAK | 5.42 | 198908250_OAK_KCA |
| Bert Blyleven | ANA | 4.77 | 198908240_ANA_KCA |
| Rick Reuschel | SFN | 3.71 | 198908230_SFN_NYN |
| Ed Whitson | SDN | 3 | 198908250_NYN_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.42 | 198908250_ANA_TEX |
| Melido Perez | CHA | -4.32 | 198908240_CHA_MIN |
| Dave Schmidt | BAL | -3.94 | 198908242_BAL_NYA |
| Jim Clancy | HOU | -2.4 | 198908230_HOU_PIT |
| Randy Johnson | SEA | -1.53 | 198908250_SEA_MIN |
Based on accumulated WAA for this season up to 1989-08-25.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 6.4 | Mike Moore | 195.3 | OAK |
| +005+ | 6.19 | Bert Blyleven | 195.7 | ANA |
| +006+ | 6.13 | Chris Bosio | 205.7 | MIL |
| +008+ | 6 | Orel Hershiser | 206 | LAN |
| +012+ | 5.06 | Rick Reuschel | 166 | SFN |
| +015+ | 4.94 | Chuck Finley | 176.3 | ANA |
| +016+ | 4.91 | Mark Langston | 208 | TOT |
| +017+ | 4.86 | Ed Whitson | 193 | SDN |
| +020+ | 4.71 | Bret Saberhagen | 190.7 | KCA |
| +021+ | 4.63 | John Smiley | 187.7 | PIT |
| +025+ | 4.53 | Scott Garrelts | 140.3 | SFN |
| +028+ | 4.29 | Bryn Smith | 173 | WAS |
| +029+ | 4.16 | Mark Gubicza | 225.7 | KCA |
| +032+ | 3.86 | Joe Magrane | 190.3 | SLN |
| +035+ | 3.73 | Doug Drabek | 197 | PIT |
| +036+ | 3.69 | John Smoltz | 197.7 | ATL |
| +038+ | 3.6 | Kirk McCaskill | 165.7 | ANA |
| +039+ | 3.59 | Sid Fernandez | 166.3 | NYN |
| +049+ | 3.32 | Mike Morgan | 141.7 | LAN |
| +050+ | 3.3 | Bruce Hurst | 199.3 | SDN |
| +054+ | 3.15 | Greg Maddux | 189 | CHN |
| +055+ | 3.15 | John Cerutti | 168 | TOR |
| +057+ | 3.1 | Mike Bielecki | 173.7 | CHN |
| +058+ | 3.06 | Bob Welch | 164 | OAK |
| +059+ | 3.05 | Tom Gordon | 125.3 | KCA |
_