| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 12.24 | 198905260_NYN_LAN |
| Roger Clemens | BOS | 5.85 | 198905260_ANA_BOS |
| Jimmy Key | TOR | 3.65 | 198905260_CHA_TOR |
| Frank Viola | MIN | 3.54 | 198905240_MIN_TOR |
| Dennis Martinez | WAS | 3.33 | 198905250_WAS_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Smithson | BOS | -4.74 | 198905250_SEA_BOS |
| Bobby Witt | TEX | -3.13 | 198905260_TEX_MIN |
| Andy Hawkins | NYA | -2.15 | 198905260_OAK_NYA |
| Rich Yett | CLE | -1.48 | 198905260_BAL_CLE |
| Mike Birkbeck | MIL | -1.29 | 198905240_OAK_MIL |
Based on accumulated WAA for this season up to 1989-05-26.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 2.93 | Kirk McCaskill | 64 | ANA |
| +003+ | 2.91 | Chuck Finley | 68.7 | ANA |
| +004+ | 2.88 | Mike Morgan | 51.7 | LAN |
| +005+ | 2.83 | Mike Moore | 69 | OAK |
| +007+ | 2.71 | Jose Rijo | 57.3 | CIN |
| +009+ | 2.67 | Rick Reuschel | 74.3 | SFN |
| +010+ | 2.62 | Bryn Smith | 62.3 | WAS |
| +014+ | 2.48 | Dwight Gooden | 74 | NYN |
| +016+ | 2.43 | Ed Whitson | 75.3 | SDN |
| +017+ | 2.35 | John Smoltz | 74 | ATL |
| +019+ | 2.29 | Mike Bielecki | 46.3 | CHN |
| +020+ | 2.2 | Bert Blyleven | 65.3 | ANA |
| +024+ | 2.08 | Orel Hershiser | 77 | LAN |
| +025+ | 2.06 | Doug Drabek | 69 | PIT |
| +027+ | 1.96 | Jeff Ballard | 60.3 | BAL |
| +032+ | 1.85 | John Smiley | 69 | PIT |
| +034+ | 1.83 | Todd Burns | 35.7 | OAK |
| +036+ | 1.76 | Dennis Martinez | 74.3 | WAS |
| +040+ | 1.74 | Jimmy Key | 83 | TOR |
| +042+ | 1.72 | Mike Scott | 74 | HOU |
| +044+ | 1.7 | Scott Terry | 52.3 | SLN |
| +049+ | 1.63 | Scott Garrelts | 67 | SFN |
| +050+ | 1.62 | Ken Hill | 56.3 | SLN |
| +056+ | 1.49 | Bret Saberhagen | 82.3 | KCA |
| +060+ | 1.41 | Tom Glavine | 55.7 | ATL |
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