| 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 |
|---|---|---|---|
| Bob Knepper | HOU | -6.19 | 198907172_HOU_NYN |
| Bobby Witt | TEX | -4.49 | 198907180_BOS_TEX |
| Storm Davis | OAK | -3.04 | 198907180_OAK_DET |
| Dave LaPoint | NYA | -1.78 | 198907170_NYA_CHA |
| Wes Gardner | BOS | -1.49 | 198907170_BOS_TEX |
Based on accumulated WAA for this season up to 1989-07-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.48 | John Smoltz | 149 | ATL |
| +004+ | 5.14 | Mike Moore | 136 | OAK |
| +005+ | 5.07 | Bryn Smith | 134.7 | WAS |
| +008+ | 4.91 | Bert Blyleven | 140.7 | ANA |
| +009+ | 4.68 | Orel Hershiser | 152.3 | LAN |
| +010+ | 4.49 | Rick Reuschel | 145 | SFN |
| +013+ | 4.08 | Mark Gubicza | 175.3 | KCA |
| +015+ | 4.01 | Chuck Finley | 130.3 | ANA |
| +014+ | 4.01 | Ed Whitson | 146.3 | SDN |
| +018+ | 3.79 | Bret Saberhagen | 135.7 | KCA |
| +020+ | 3.69 | Greg Swindell | 142.7 | CLE |
| +021+ | 3.67 | Mike Morgan | 123 | LAN |
| +025+ | 3.39 | Mike Scott | 140.3 | HOU |
| +026+ | 3.36 | Chris Bosio | 152 | MIL |
| +033+ | 3.1 | John Cerutti | 123.3 | TOR |
| +038+ | 2.9 | Scott Garrelts | 114.3 | SFN |
| +039+ | 2.86 | Mike Bielecki | 119.7 | CHN |
| +042+ | 2.81 | Scott Bankhead | 125.7 | SEA |
| +044+ | 2.79 | Doug Drabek | 141 | PIT |
| +045+ | 2.77 | Sid Fernandez | 117 | NYN |
| +047+ | 2.75 | Mark Langston | 150.3 | TOT |
| +053+ | 2.51 | Todd Burns | 67.3 | OAK |
| +060+ | 2.31 | Jose Rijo | 111.3 | CIN |
| +062+ | 2.28 | Greg Maddux | 132.3 | CHN |
| +067+ | 2.24 | Rick Mahler | 154 | CIN |
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