| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Smithson | BOS | -6.39 | 198905060_TEX_BOS |
| Rich Yett | CLE | -2.64 | 198905072_MIN_CLE |
| Fred Toliver | MIN | -1.87 | 198905072_MIN_CLE |
| 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 1989-05-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 2.69 | Kirk McCaskill | 44 | ANA |
| +003+ | 2.61 | Mike Morgan | 39 | LAN |
| +004+ | 2.25 | Jose Rijo | 44 | CIN |
| +010+ | 1.97 | Orel Hershiser | 54 | LAN |
| +013+ | 1.94 | Tom Glavine | 46.7 | ATL |
| +015+ | 1.93 | Chris Bosio | 51.7 | MIL |
| +017+ | 1.88 | Ed Whitson | 53.7 | SDN |
| +020+ | 1.82 | Mark Gubicza | 65 | KCA |
| +022+ | 1.74 | Mike Moore | 44.3 | OAK |
| +024+ | 1.68 | Doug Drabek | 51 | PIT |
| +025+ | 1.67 | Bert Blyleven | 44.3 | ANA |
| +028+ | 1.64 | Mike Bielecki | 28.7 | CHN |
| +029+ | 1.62 | Dwight Gooden | 50.7 | NYN |
| +030+ | 1.61 | Eric King | 51 | CHA |
| +031+ | 1.6 | Ken Hill | 31 | SLN |
| +033+ | 1.58 | Mike Flanagan | 42.7 | TOR |
| +032+ | 1.58 | John Smiley | 45 | PIT |
| +036+ | 1.53 | John Cerutti | 39.7 | TOR |
| +042+ | 1.33 | Greg Swindell | 50 | CLE |
| +044+ | 1.31 | Erik Hanson | 39 | SEA |
| +045+ | 1.3 | Jose DeLeon | 52 | SLN |
| +047+ | 1.28 | Dave Stewart | 48.7 | OAK |
| +049+ | 1.27 | John Dopson | 43.3 | BOS |
| XXXXX | 1.2 | Roger Clemens | 52.7 | BOS |
| XXXXX | 1.07 | Chuck Finley | 44.7 | ANA |
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