| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Langston | WAS | 3.35 | 198907150_WAS_CIN |
| Nolan Ryan | TEX | 2.9 | 198907150_TEX_CLE |
| Mike Moore | OAK | 2.68 | 198907160_OAK_TOR |
| Chuck Finley | ANA | 2.43 | 198907150_ANA_BAL |
| Greg Swindell | CLE | 2.2 | 198907150_TEX_CLE |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Knepper | HOU | -6.19 | 198907172_HOU_NYN |
| Melido Perez | CHA | -4.72 | 198907150_MIL_CHA |
| Kevin Gross | WAS | -2.29 | 198907160_WAS_CIN |
| Dave LaPoint | NYA | -1.78 | 198907170_NYA_CHA |
| Curt Young | OAK | -1.69 | 198907170_OAK_DET |
Based on accumulated WAA for this season up to 1989-07-17.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.3 | John Smoltz | 142 | ATL |
| +004+ | 5.11 | Mike Moore | 136 | OAK |
| +005+ | 4.9 | Bryn Smith | 127.7 | WAS |
| +009+ | 4.45 | Rick Reuschel | 145 | SFN |
| +010+ | 4.1 | Bert Blyleven | 131.7 | ANA |
| +011+ | 4.02 | Doug Drabek | 134 | PIT |
| +012+ | 3.98 | Chuck Finley | 130.3 | ANA |
| +013+ | 3.97 | Mark Gubicza | 167.3 | KCA |
| +014+ | 3.88 | Orel Hershiser | 143.3 | LAN |
| +017+ | 3.85 | Mike Morgan | 118 | LAN |
| +018+ | 3.75 | Bret Saberhagen | 135.7 | KCA |
| +021+ | 3.65 | Greg Swindell | 142.7 | CLE |
| +025+ | 3.41 | Ed Whitson | 137.3 | SDN |
| +027+ | 3.32 | Mike Scott | 140.3 | HOU |
| +032+ | 3.07 | John Cerutti | 123.3 | TOR |
| +037+ | 2.87 | Scott Garrelts | 114.3 | SFN |
| +042+ | 2.77 | Scott Bankhead | 125.7 | SEA |
| +046+ | 2.73 | Mark Langston | 150.3 | TOT |
| +047+ | 2.73 | Chris Bosio | 143 | MIL |
| +049+ | 2.58 | Dennis Martinez | 137.3 | WAS |
| +051+ | 2.55 | Greg Maddux | 126.3 | CHN |
| +052+ | 2.47 | Roger Clemens | 146.3 | BOS |
| +059+ | 2.35 | Todd Burns | 65.7 | OAK |
| +060+ | 2.29 | Jose Rijo | 111.3 | CIN |
| +066+ | 2.2 | Rick Mahler | 154 | CIN |
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