| Starter | Tm | Tier | Game |
|---|---|---|---|
| Fred Toliver | MIN | -2.83 | 198905020_BOS_MIN |
| Bill Long | CHA | -2.81 | 198905040_BOS_CHA |
| Wes Gardner | BOS | -1.4 | 198905040_BOS_CHA |
| Dennis Rasmussen | SDN | -1.37 | 198905030_CHN_SDN |
| Jose Bautista | BAL | -1.21 | 198905020_ANA_BAL |
Based on accumulated WAA for this season up to 1989-05-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.71 | Kirk McCaskill | 44 | ANA |
| +002+ | 2.41 | Jose DeLeon | 50.3 | SLN |
| +004+ | 2.15 | Orel Hershiser | 46 | LAN |
| +005+ | 2.12 | Mike Morgan | 33 | LAN |
| +009+ | 2 | Doug Drabek | 45 | PIT |
| +010+ | 1.97 | Tom Glavine | 46.7 | ATL |
| +012+ | 1.87 | Jeff Ballard | 37 | BAL |
| +015+ | 1.74 | Dwight Gooden | 44.7 | NYN |
| +016+ | 1.72 | John Cerutti | 32 | TOR |
| +019+ | 1.69 | Bert Blyleven | 44.3 | ANA |
| +020+ | 1.67 | Jose Rijo | 37 | CIN |
| +021+ | 1.67 | Roger Clemens | 45.7 | BOS |
| +022+ | 1.64 | Mike Bielecki | 28.7 | CHN |
| +026+ | 1.6 | Ken Hill | 31 | SLN |
| +025+ | 1.6 | Mike Flanagan | 42.7 | TOR |
| +027+ | 1.58 | John Smiley | 45 | PIT |
| +029+ | 1.56 | Chris Bosio | 46.7 | MIL |
| +030+ | 1.55 | Doyle Alexander | 47.7 | DET |
| +035+ | 1.4 | Ed Whitson | 45.3 | SDN |
| +040+ | 1.37 | Steve Ontiveros | 20 | PHI |
| +041+ | 1.36 | Mike Moore | 37.3 | OAK |
| +042+ | 1.33 | Erik Hanson | 39 | SEA |
| +045+ | 1.26 | Nolan Ryan | 35 | TEX |
| XXXXX | 1.23 | Eric King | 44 | CHA |
| XXXXX | 1.13 | Dave Stewart | 42 | OAK |
_