| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Scott | HOU | 4.92 | 198907260_LAN_HOU |
| Mike Moore | OAK | 4.17 | 198907260_ANA_OAK |
| Greg Swindell | CLE | 3.69 | 198907250_NYA_CLE |
| Bret Saberhagen | KCA | 3.68 | 198907260_KCA_BOS |
| Mark Langston | WAS | 3.04 | 198907250_PHI_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Swift | SEA | -2.99 | 198907260_SEA_CHA |
| Melido Perez | CHA | -2.56 | 198907270_CHA_ANA |
| Dave Schmidt | BAL | -1.99 | 198907250_BAL_MIN |
| Don Carman | PHI | -1.79 | 198907250_PHI_WAS |
| Kevin Gross | WAS | -1.58 | 198907260_PHI_WAS |
Based on accumulated WAA for this season up to 1989-07-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.87 | John Smoltz | 158 | ATL |
| +003+ | 5.4 | Bryn Smith | 141.7 | WAS |
| +004+ | 5.18 | Mike Moore | 151.3 | OAK |
| +006+ | 4.93 | Rick Reuschel | 150 | SFN |
| +008+ | 4.77 | Bert Blyleven | 147.7 | ANA |
| +009+ | 4.74 | Orel Hershiser | 160 | LAN |
| +010+ | 4.71 | Chuck Finley | 147 | ANA |
| +015+ | 4.22 | Mike Scott | 155.3 | HOU |
| +017+ | 4.18 | Ed Whitson | 153.3 | SDN |
| +018+ | 4.04 | Mark Langston | 168.3 | TOT |
| +019+ | 3.96 | Scott Garrelts | 129 | SFN |
| +020+ | 3.93 | Chris Bosio | 159 | MIL |
| +021+ | 3.75 | Greg Swindell | 153.3 | CLE |
| +027+ | 3.43 | John Cerutti | 129.3 | TOR |
| +029+ | 3.4 | Bret Saberhagen | 150.7 | KCA |
| +036+ | 3.22 | Mike Bielecki | 126.7 | CHN |
| +037+ | 3.22 | Mark Gubicza | 180 | KCA |
| +040+ | 3.15 | Doug Drabek | 148 | PIT |
| +041+ | 3.1 | Mike Morgan | 128.3 | LAN |
| +043+ | 2.94 | Kevin Brown | 146.3 | TEX |
| +044+ | 2.93 | John Smiley | 150.3 | PIT |
| +056+ | 2.52 | Todd Burns | 70 | OAK |
| +063+ | 2.33 | Jose Rijo | 111.3 | CIN |
| +065+ | 2.3 | Scott Bankhead | 136.7 | SEA |
| +066+ | 2.29 | Jim Deshaies | 147.3 | HOU |
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