| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 9.33 | 198905050_TEX_BOS |
| Mark Gubicza | KCA | 4 | 198905060_KCA_MIL |
| Rick Reuschel | SFN | 3.95 | 198905060_SLN_SFN |
| Frank Viola | MIN | 3.57 | 198905040_MIL_MIN |
| Nolan Ryan | TEX | 3.54 | 198905050_TEX_BOS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Smithson | BOS | -6.39 | 198905060_TEX_BOS |
| Bill Long | CHA | -2.81 | 198905040_BOS_CHA |
| Mike Birkbeck | MIL | -1.67 | 198905050_KCA_MIL |
| Storm Davis | OAK | -1.44 | 198905060_OAK_DET |
| Rich Dotson | NYA | -1.25 | 198905060_NYA_CHA |
Based on accumulated WAA for this season up to 1989-05-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.69 | Kirk McCaskill | 44 | ANA |
| +002+ | 2.61 | Mike Morgan | 39 | LAN |
| +005+ | 2.14 | Orel Hershiser | 46 | LAN |
| +012+ | 1.93 | Tom Glavine | 46.7 | ATL |
| +016+ | 1.78 | Mark Gubicza | 65 | KCA |
| +018+ | 1.71 | Dwight Gooden | 44.7 | NYN |
| +019+ | 1.66 | Bert Blyleven | 44.3 | ANA |
| +020+ | 1.65 | Doug Drabek | 51 | PIT |
| +022+ | 1.65 | Jose Rijo | 37 | CIN |
| +023+ | 1.63 | Mike Bielecki | 28.7 | CHN |
| +025+ | 1.59 | Ken Hill | 31 | SLN |
| +026+ | 1.57 | Mike Flanagan | 42.7 | TOR |
| +027+ | 1.56 | John Smiley | 45 | PIT |
| +028+ | 1.52 | John Cerutti | 39.7 | TOR |
| +029+ | 1.51 | Doyle Alexander | 47.7 | DET |
| +033+ | 1.49 | Chris Bosio | 46.7 | MIL |
| +037+ | 1.36 | Ed Whitson | 45.3 | SDN |
| +038+ | 1.36 | Steve Ontiveros | 20 | PHI |
| +039+ | 1.34 | Mike Moore | 37.3 | OAK |
| +041+ | 1.3 | Erik Hanson | 39 | SEA |
| +044+ | 1.28 | Dave Stewart | 48.7 | OAK |
| +043+ | 1.28 | Jose DeLeon | 52 | SLN |
| XXXXX | 1.22 | Eric King | 44 | CHA |
| XXXXX | 1.18 | Roger Clemens | 52.7 | BOS |
| XXXXX | 1.02 | Rick Reuschel | 50 | SFN |
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