| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Long | CHA | -2.81 | 198905040_BOS_CHA |
| Mike Birkbeck | MIL | -1.67 | 198905050_KCA_MIL |
| Wes Gardner | BOS | -1.4 | 198905040_BOS_CHA |
| Dennis Rasmussen | SDN | -1.37 | 198905030_CHN_SDN |
| Ken Howell | PHI | -1.22 | 198905050_PHI_CIN |
Based on accumulated WAA for this season up to 1989-05-05.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.7 | Kirk McCaskill | 44 | ANA |
| +002+ | 2.39 | Jose DeLeon | 50.3 | SLN |
| +005+ | 2.15 | Orel Hershiser | 46 | LAN |
| +006+ | 2.11 | Mike Morgan | 33 | LAN |
| +011+ | 1.98 | Doug Drabek | 45 | PIT |
| +013+ | 1.95 | Tom Glavine | 46.7 | ATL |
| +016+ | 1.86 | Jeff Ballard | 37 | BAL |
| +018+ | 1.73 | Dwight Gooden | 44.7 | NYN |
| +020+ | 1.68 | Bert Blyleven | 44.3 | ANA |
| +021+ | 1.66 | Jose Rijo | 37 | CIN |
| +024+ | 1.63 | Mike Bielecki | 28.7 | CHN |
| +026+ | 1.59 | Mike Flanagan | 42.7 | TOR |
| +025+ | 1.59 | Ken Hill | 31 | SLN |
| +028+ | 1.56 | John Smiley | 45 | PIT |
| +029+ | 1.54 | John Cerutti | 39.7 | TOR |
| +030+ | 1.53 | Doyle Alexander | 47.7 | DET |
| +031+ | 1.52 | Chris Bosio | 46.7 | MIL |
| +037+ | 1.38 | Ed Whitson | 45.3 | SDN |
| +039+ | 1.36 | Steve Ontiveros | 20 | PHI |
| +040+ | 1.34 | Mike Moore | 37.3 | OAK |
| +041+ | 1.32 | Erik Hanson | 39 | SEA |
| +045+ | 1.28 | Dave Stewart | 48.7 | OAK |
| XXXXX | 1.22 | Eric King | 44 | CHA |
| XXXXX | 1.19 | Roger Clemens | 52.7 | BOS |
| XXXXX | 1.06 | Mark Gubicza | 56 | KCA |
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