| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Reuschel | SFN | 8.83 | 198907140_PIT_SFN |
| Mark Gubicza | KCA | 6.9 | 198907130_KCA_NYA |
| Orel Hershiser | LAN | 6.89 | 198907130_SLN_LAN |
| Doug Drabek | PIT | 6.04 | 198907140_PIT_SFN |
| Roger Clemens | BOS | 4.51 | 198907130_BOS_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.76 | 198907130_TEX_CLE |
| Melido Perez | CHA | -4.72 | 198907150_MIL_CHA |
| Bob Knepper | HOU | -3.01 | 198907131_HOU_PHI |
| Storm Davis | OAK | -2.36 | 198907130_OAK_TOR |
| Mike Boddicker | BOS | -1.39 | 198907140_BOS_MIN |
Based on accumulated WAA for this season up to 1989-07-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.28 | John Smoltz | 142 | ATL |
| +004+ | 4.94 | Bryn Smith | 127.7 | WAS |
| +005+ | 4.58 | Mike Moore | 130 | OAK |
| +008+ | 4.45 | Rick Reuschel | 145 | SFN |
| +010+ | 4.08 | Bert Blyleven | 131.7 | ANA |
| +011+ | 4 | Doug Drabek | 134 | PIT |
| +012+ | 3.96 | Chuck Finley | 130.3 | ANA |
| +013+ | 3.92 | Mark Gubicza | 167.3 | KCA |
| +014+ | 3.87 | Orel Hershiser | 143.3 | LAN |
| +015+ | 3.84 | Mike Morgan | 118 | LAN |
| +017+ | 3.71 | Bret Saberhagen | 135.7 | KCA |
| +019+ | 3.63 | Greg Swindell | 142.7 | CLE |
| +023+ | 3.41 | Ed Whitson | 137.3 | SDN |
| +025+ | 3.31 | Mike Scott | 140.3 | HOU |
| +038+ | 2.76 | John Cerutti | 117.3 | TOR |
| +039+ | 2.74 | Mark Langston | 150.3 | TOT |
| +040+ | 2.74 | Scott Bankhead | 125.7 | SEA |
| +042+ | 2.7 | Chris Bosio | 143 | MIL |
| +047+ | 2.63 | Dennis Martinez | 137.3 | WAS |
| +049+ | 2.54 | Greg Maddux | 126.3 | CHN |
| +052+ | 2.49 | Kevin Brown | 124.3 | TEX |
| +054+ | 2.47 | Roger Clemens | 146.3 | BOS |
| +059+ | 2.35 | Scott Garrelts | 108.3 | SFN |
| +066+ | 2.15 | Jose Rijo | 109.3 | CIN |
| +067+ | 2.14 | Todd Burns | 63.3 | OAK |
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