| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Yett | CLE | -3.49 | 198905010_CLE_TEX |
| Oil Can Boyd | BOS | -3.43 | 198905010_BOS_MIN |
| Fred Toliver | MIN | -2.83 | 198905020_BOS_MIN |
| Jerry Reuss | CHA | -2.16 | 198905010_MIL_CHA |
| Dennis Rasmussen | SDN | -1.37 | 198905030_CHN_SDN |
Based on accumulated WAA for this season up to 1989-05-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.52 | Kirk McCaskill | 36.7 | ANA |
| +002+ | 2.42 | Jose DeLeon | 50.3 | SLN |
| +003+ | 2.16 | Orel Hershiser | 46 | LAN |
| +005+ | 2.13 | Mike Morgan | 33 | LAN |
| +009+ | 2 | Doug Drabek | 45 | PIT |
| +011+ | 1.88 | Jeff Ballard | 37 | BAL |
| +012+ | 1.77 | Dwight Gooden | 44.7 | NYN |
| +013+ | 1.75 | John Cerutti | 32 | TOR |
| +014+ | 1.71 | Bert Blyleven | 44.3 | ANA |
| +015+ | 1.68 | Jose Rijo | 37 | CIN |
| +017+ | 1.66 | Roger Clemens | 45.7 | BOS |
| +019+ | 1.63 | Mike Flanagan | 42.7 | TOR |
| +021+ | 1.58 | John Smiley | 45 | PIT |
| +023+ | 1.57 | Chris Bosio | 46.7 | MIL |
| +024+ | 1.56 | Doyle Alexander | 47.7 | DET |
| +028+ | 1.41 | Ed Whitson | 45.3 | SDN |
| +033+ | 1.37 | Steve Ontiveros | 20 | PHI |
| +034+ | 1.36 | Mike Moore | 37.3 | OAK |
| +039+ | 1.34 | Erik Hanson | 39 | SEA |
| +041+ | 1.27 | Nolan Ryan | 35 | TEX |
| XXXXX | 1.24 | Eric King | 44 | CHA |
| XXXXX | 1.22 | Tom Glavine | 38 | ATL |
| XXXXX | 1.14 | Dave Stewart | 42 | OAK |
| XXXXX | 1.08 | Mark Gubicza | 56 | KCA |
| XXXXX | 1.02 | Greg Swindell | 43 | CLE |
_