| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.35 | 198907180_CHN_LAN |
| Mark Gubicza | KCA | 5.57 | 198907180_MIL_KCA |
| Doug Drabek | PIT | 5.44 | 198907190_PIT_SDN |
| Roger Clemens | BOS | 5.24 | 198907180_BOS_TEX |
| Bryn Smith | WAS | 5.13 | 198907190_ATL_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.49 | 198907180_BOS_TEX |
| Storm Davis | OAK | -3.04 | 198907180_OAK_DET |
| Dave Schmidt | BAL | -1.7 | 198907200_BAL_OAK |
| Bruce Ruffin | PHI | -1.46 | 198907180_PHI_CIN |
| Danny Jackson | CIN | -1.08 | 198907180_PHI_CIN |
Based on accumulated WAA for this season up to 1989-07-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.48 | John Smoltz | 149 | ATL |
| +004+ | 5.13 | Mike Moore | 136 | OAK |
| +006+ | 5.06 | Bryn Smith | 134.7 | WAS |
| +007+ | 4.89 | Bert Blyleven | 140.7 | ANA |
| +009+ | 4.67 | Orel Hershiser | 152.3 | LAN |
| +011+ | 4.45 | Rick Reuschel | 145 | SFN |
| +012+ | 4.28 | Greg Swindell | 149.7 | CLE |
| +014+ | 4.15 | Chuck Finley | 139.3 | ANA |
| +015+ | 4.05 | Mark Gubicza | 175.3 | KCA |
| +016+ | 4 | Ed Whitson | 146.3 | SDN |
| +021+ | 3.66 | Mike Morgan | 123 | LAN |
| +022+ | 3.65 | Bret Saberhagen | 144 | KCA |
| +025+ | 3.37 | Mike Scott | 140.3 | HOU |
| +027+ | 3.34 | Chris Bosio | 152 | MIL |
| +028+ | 3.3 | Mark Langston | 159.3 | TOT |
| +034+ | 3.1 | John Cerutti | 123.3 | TOR |
| +035+ | 3.05 | Scott Bankhead | 133.3 | SEA |
| +041+ | 2.87 | Scott Garrelts | 114.3 | SFN |
| +043+ | 2.82 | Mike Bielecki | 119.7 | CHN |
| +045+ | 2.78 | Doug Drabek | 141 | PIT |
| +046+ | 2.76 | Sid Fernandez | 117 | NYN |
| +055+ | 2.51 | Todd Burns | 67.3 | OAK |
| +060+ | 2.31 | Jose Rijo | 111.3 | CIN |
| +066+ | 2.24 | Greg Maddux | 132.3 | CHN |
| +072+ | 2.16 | Bruce Hurst | 149.3 | SDN |
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