| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.56 | 198904150_HOU_LAN |
| Roger Clemens | BOS | 7.32 | 198904130_CLE_BOS |
| Frank Viola | MIN | 5.58 | 198904140_MIN_NYA |
| Rick Reuschel | SFN | 4.28 | 198904140_ATL_SFN |
| Dennis Martinez | WAS | 3.92 | 198904140_WAS_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Birkbeck | MIL | -2.41 | 198904140_CLE_MIL |
| Jeff Ballard | BAL | -2.18 | 198904150_BAL_BOS |
| Bob Knepper | HOU | -2.15 | 198904150_HOU_LAN |
| Bruce Ruffin | PHI | -1.82 | 198904140_CHN_PHI |
| Rich Yett | CLE | -1.75 | 198904130_CLE_BOS |
Based on accumulated WAA for this season up to 1989-04-15.
| Rank | WAA | Name | IP | Tm |
|---|
_