| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 8.14 | 198907231_LAN_PIT |
| Rick Reuschel | SFN | 6.61 | 198907240_SFN_ATL |
| Bryn Smith | WAS | 5.25 | 198907240_PHI_WAS |
| Mark Gubicza | KCA | 5.03 | 198907230_CLE_KCA |
| John Smoltz | ATL | 3.97 | 198907240_SFN_ATL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -3.36 | 198907230_NYA_TEX |
| Storm Davis | OAK | -2.7 | 198907230_BAL_OAK |
| Jerry Reuss | CHA | -2.49 | 198907240_SEA_CHA |
| Bruce Ruffin | PHI | -2.33 | 198907230_PHI_HOU |
| Dave Schmidt | BAL | -1.99 | 198907250_BAL_MIN |
Based on accumulated WAA for this season up to 1989-07-25.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.83 | John Smoltz | 158 | ATL |
| +003+ | 5.43 | Mike Moore | 145 | OAK |
| +004+ | 5.36 | Bryn Smith | 141.7 | WAS |
| +007+ | 4.86 | Rick Reuschel | 150 | SFN |
| +008+ | 4.72 | Bert Blyleven | 147.7 | ANA |
| +009+ | 4.68 | Orel Hershiser | 160 | LAN |
| +011+ | 4.66 | Chuck Finley | 147 | ANA |
| +015+ | 4.13 | Ed Whitson | 153.3 | SDN |
| +017+ | 3.99 | Mark Langston | 168.3 | TOT |
| +018+ | 3.89 | Chris Bosio | 159 | MIL |
| +020+ | 3.72 | Mike Scott | 147.3 | HOU |
| +021+ | 3.71 | Greg Swindell | 153.3 | CLE |
| +022+ | 3.61 | Bret Saberhagen | 144 | KCA |
| +026+ | 3.38 | John Cerutti | 129.3 | TOR |
| +028+ | 3.3 | Scott Garrelts | 122 | SFN |
| +034+ | 3.17 | Mike Bielecki | 126.7 | CHN |
| +036+ | 3.15 | Mark Gubicza | 180 | KCA |
| +037+ | 3.11 | Doug Drabek | 148 | PIT |
| +041+ | 2.97 | Mike Morgan | 127.3 | LAN |
| +043+ | 2.91 | Sid Fernandez | 121.7 | NYN |
| +053+ | 2.62 | Todd Burns | 69 | OAK |
| +056+ | 2.54 | John Smiley | 141.3 | PIT |
| +058+ | 2.5 | Jim Deshaies | 140.3 | HOU |
| +061+ | 2.41 | Kevin Brown | 138.3 | TEX |
| +066+ | 2.3 | Jose Rijo | 111.3 | CIN |
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