| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 9.98 | 198904210_SFN_LAN |
| Mark Gubicza | KCA | 3.66 | 198904220_KCA_BOS |
| Rick Reuschel | SFN | 3.28 | 198904230_SFN_LAN |
| Bob Welch | OAK | 3.28 | 198904210_ANA_OAK |
| Pascual Perez | WAS | 2.9 | 198904210_WAS_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Trout | SEA | -5.21 | 198904230_SEA_CHA |
| Bob Knepper | HOU | -2.37 | 198904230_HOU_CIN |
| Neal Heaton | PIT | -1.82 | 198904220_PHI_PIT |
| Andy Hawkins | NYA | -1.68 | 198904230_NYA_CLE |
| Fred Toliver | MIN | -1.65 | 198904220_MIN_BAL |
Based on accumulated WAA for this season up to 1989-04-23.
| Rank | WAA | Name | IP | Tm |
|---|
_