| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Gubicza | KCA | 6.99 | 198907080_CHA_KCA |
| Orel Hershiser | LAN | 6.89 | 198907130_SLN_LAN |
| Mike Scott | HOU | 5.53 | 198907090_WAS_HOU |
| Roger Clemens | BOS | 4.51 | 198907130_BOS_MIN |
| Bryn Smith | WAS | 3.69 | 198907080_WAS_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.76 | 198907130_TEX_CLE |
| Jerry Reuss | CHA | -3.31 | 198907130_MIL_CHA |
| Bob Knepper | HOU | -3.01 | 198907131_HOU_PHI |
| Storm Davis | OAK | -2.36 | 198907130_OAK_TOR |
| Bruce Ruffin | PHI | -1.39 | 198907131_HOU_PHI |
Based on accumulated WAA for this season up to 1989-07-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.02 | Rick Reuschel | 140 | SFN |
| +003+ | 4.98 | John Smoltz | 134 | ATL |
| +004+ | 4.83 | Mike Morgan | 115.3 | LAN |
| +009+ | 4.51 | Mike Moore | 130 | OAK |
| +010+ | 4.27 | Doug Drabek | 128 | PIT |
| +011+ | 4.22 | Chuck Finley | 124.3 | ANA |
| +012+ | 4.17 | Bryn Smith | 119.3 | WAS |
| +013+ | 4.02 | Bert Blyleven | 131.7 | ANA |
| +014+ | 3.85 | Mark Gubicza | 167.3 | KCA |
| +015+ | 3.82 | Orel Hershiser | 143.3 | LAN |
| +020+ | 3.53 | Ed Whitson | 129.3 | SDN |
| +022+ | 3.39 | Bret Saberhagen | 127.7 | KCA |
| +023+ | 3.36 | Chris Bosio | 137 | MIL |
| +025+ | 3.25 | Mike Scott | 140.3 | HOU |
| +030+ | 3.02 | Greg Swindell | 133.7 | CLE |
| +031+ | 3.01 | Mark Langston | 144.3 | TOT |
| +038+ | 2.73 | Scott Bankhead | 118.7 | SEA |
| +039+ | 2.72 | John Cerutti | 117.3 | TOR |
| +043+ | 2.61 | Mike Bielecki | 106 | CHN |
| +046+ | 2.57 | Dennis Martinez | 137.3 | WAS |
| +051+ | 2.47 | Greg Maddux | 126.3 | CHN |
| +052+ | 2.45 | Nolan Ryan | 127 | TEX |
| +053+ | 2.43 | Kevin Brown | 124.3 | TEX |
| +056+ | 2.41 | Roger Clemens | 146.3 | BOS |
| +059+ | 2.35 | Kirk McCaskill | 112.3 | ANA |
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