| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.62 | 198904100_LAN_SFN |
| Pascual Perez | WAS | 3.39 | 198904110_WAS_PHI |
| Mark Gubicza | KCA | 2.86 | 198904120_BAL_KCA |
| Charlie Hough | TEX | 2.43 | 198904100_TEX_MIL |
| Doug Drabek | PIT | 1.89 | 198904110_NYN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Campbell | SEA | -3.81 | 198904110_CHA_SEA |
| Oil Can Boyd | BOS | -3.58 | 198904120_CLE_BOS |
| Kirk McCaskill | ANA | -1.7 | 198904120_OAK_ANA |
| Bob Knepper | HOU | -1.53 | 198904100_CIN_HOU |
| Tom Glavine | ATL | -1.52 | 198904120_ATL_SDN |
Based on accumulated WAA for this season up to 1989-04-12.
| Rank | WAA | Name | IP | Tm |
|---|
_