| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Reuschel | SFN | 7.72 | 198906160_CIN_SFN |
| Mark Gubicza | KCA | 6.96 | 198906170_KCA_CLE |
| Roger Clemens | BOS | 6.36 | 198906160_BOS_CHA |
| Mike Scott | HOU | 6.16 | 198906180_HOU_SDN |
| Bryn Smith | WAS | 2.24 | 198906160_CHN_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.1 | 198906161_TEX_NYA |
| Melido Perez | CHA | -3.58 | 198906170_BOS_CHA |
| Mike Smithson | BOS | -2.6 | 198906170_BOS_CHA |
| Andy Hawkins | NYA | -2.22 | 198906161_TEX_NYA |
| David Palmer | DET | -1.61 | 198906180_ANA_DET |
Based on accumulated WAA for this season up to 1989-06-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 4.02 | Mike Morgan | 87.3 | LAN |
| +005+ | 3.73 | Rick Reuschel | 111.7 | SFN |
| +006+ | 3.49 | Mike Moore | 101 | OAK |
| +009+ | 3.29 | Mark Gubicza | 130.3 | KCA |
| +010+ | 3.27 | John Smoltz | 105.3 | ATL |
| +011+ | 3.26 | Greg Swindell | 112.3 | CLE |
| +012+ | 3.21 | Ed Whitson | 104.3 | SDN |
| +013+ | 3.14 | Mike Scott | 114.3 | HOU |
| +015+ | 3.09 | Chuck Finley | 92 | ANA |
| +019+ | 2.85 | Bryn Smith | 92.3 | WAS |
| +020+ | 2.83 | Orel Hershiser | 106 | LAN |
| +024+ | 2.71 | Dwight Gooden | 99 | NYN |
| +026+ | 2.68 | Kirk McCaskill | 89.7 | ANA |
| +028+ | 2.65 | Scott Garrelts | 96.3 | SFN |
| +029+ | 2.63 | Bert Blyleven | 94 | ANA |
| +038+ | 2.38 | Mike Bielecki | 79.3 | CHN |
| +040+ | 2.37 | Dennis Martinez | 104 | WAS |
| +044+ | 2.26 | Doug Drabek | 94.7 | PIT |
| +046+ | 2.22 | Roger Clemens | 111.3 | BOS |
| +047+ | 2.22 | John Cerutti | 89.3 | TOR |
| +048+ | 2.21 | Jeff Ballard | 83 | BAL |
| +049+ | 2.2 | Todd Burns | 49.7 | OAK |
| +054+ | 2.14 | Chris Bosio | 104.3 | MIL |
| +058+ | 2.01 | Bret Saberhagen | 100.3 | KCA |
| +061+ | 1.98 | Bob Welch | 93.3 | OAK |
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