| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.56 | 198904150_HOU_LAN |
| Dwight Gooden | NYN | 3.91 | 198904150_NYN_SLN |
| Bob Welch | OAK | 2.77 | 198904150_OAK_CHA |
| Nolan Ryan | TEX | 2.76 | 198904170_MIL_TEX |
| Pascual Perez | WAS | 2.48 | 198904160_WAS_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Campbell | SEA | -4.32 | 198904160_ANA_SEA |
| Neal Heaton | PIT | -2.33 | 198904170_PIT_SLN |
| Andy Hawkins | NYA | -2.3 | 198904170_NYA_TOR |
| Storm Davis | OAK | -2.24 | 198904160_OAK_CHA |
| Jeff Ballard | BAL | -2.18 | 198904150_BAL_BOS |
Based on accumulated WAA for this season up to 1989-04-17.
| Rank | WAA | Name | IP | Tm |
|---|
_