| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.13 | 198907280_LAN_SDN |
| Mike Scott | HOU | 4.92 | 198907260_LAN_HOU |
| Mike Moore | OAK | 4.17 | 198907260_ANA_OAK |
| Bret Saberhagen | KCA | 3.68 | 198907260_KCA_BOS |
| Bert Blyleven | ANA | 3.51 | 198907280_CHA_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Swift | SEA | -2.99 | 198907260_SEA_CHA |
| Melido Perez | CHA | -2.56 | 198907270_CHA_ANA |
| Wes Gardner | BOS | -2.55 | 198907282_BOS_CLE |
| Dave LaPoint | NYA | -2.02 | 198907280_TOR_NYA |
| Pete Smith | ATL | -1.99 | 198907280_CIN_ATL |
Based on accumulated WAA for this season up to 1989-07-28.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.75 | John Smoltz | 158 | ATL |
| +004+ | 5.41 | Bryn Smith | 141.7 | WAS |
| +005+ | 5.16 | Mike Moore | 151.3 | OAK |
| +008+ | 5.02 | Orel Hershiser | 168 | LAN |
| +009+ | 4.94 | Rick Reuschel | 150 | SFN |
| +010+ | 4.72 | Chuck Finley | 147 | ANA |
| +012+ | 4.51 | Bert Blyleven | 154.3 | ANA |
| +015+ | 4.23 | Mike Scott | 155.3 | HOU |
| +016+ | 4.19 | Ed Whitson | 153.3 | SDN |
| +018+ | 4.04 | Mark Langston | 168.3 | TOT |
| +019+ | 4.03 | Chris Bosio | 159 | MIL |
| +020+ | 3.97 | Scott Garrelts | 129 | SFN |
| +021+ | 3.75 | Greg Swindell | 153.3 | CLE |
| +027+ | 3.62 | John Cerutti | 136.3 | TOR |
| +032+ | 3.36 | Bret Saberhagen | 150.7 | KCA |
| +034+ | 3.22 | Mike Bielecki | 126.7 | CHN |
| +036+ | 3.19 | Mark Gubicza | 187.7 | KCA |
| +038+ | 3.17 | Doug Drabek | 148 | PIT |
| +040+ | 3.12 | Mike Morgan | 128.3 | LAN |
| +044+ | 2.95 | Kevin Brown | 146.3 | TEX |
| +045+ | 2.95 | John Smiley | 150.3 | PIT |
| +052+ | 2.7 | Bruce Hurst | 165.3 | SDN |
| +058+ | 2.47 | Todd Burns | 72 | OAK |
| +065+ | 2.38 | Bob Welch | 129 | OAK |
| +067+ | 2.3 | Jim Deshaies | 147.3 | HOU |
_