| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 10.82 | 198904270_LAN_CHN |
| Pascual Perez | WAS | 4.42 | 198904260_WAS_CIN |
| Dwight Gooden | NYN | 4.26 | 198904260_ATL_NYN |
| Mark Gubicza | KCA | 3.88 | 198904270_NYA_KCA |
| Allan Anderson | MIN | 3.42 | 198904260_MIN_MIL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Oil Can Boyd | BOS | -3.91 | 198904260_CHA_BOS |
| Mike Campbell | SEA | -3.34 | 198904260_TOR_SEA |
| Jose Bautista | BAL | -2.34 | 198904260_BAL_OAK |
| Jerry Reuss | CHA | -1.78 | 198904260_CHA_BOS |
| Al Leiter | NYA | -1.62 | 198904260_NYA_KCA |
Based on accumulated WAA for this season up to 1989-04-28.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.56 | Kirk McCaskill | 36.7 | ANA |
| +003+ | 2.15 | Chris Bosio | 39.3 | MIL |
| +004+ | 1.93 | Jose Rijo | 31 | CIN |
| +009+ | 1.68 | Jeff Ballard | 30 | BAL |
| +010+ | 1.64 | Jose DeLeon | 41.3 | SLN |
| +011+ | 1.6 | Tom Glavine | 33 | ATL |
| +012+ | 1.55 | Scott Terry | 35.3 | SLN |
| +015+ | 1.47 | John Smiley | 36.7 | PIT |
| +016+ | 1.45 | Mike Morgan | 25 | LAN |
| +017+ | 1.44 | Doug Drabek | 36.3 | PIT |
| +021+ | 1.4 | Mike Moore | 33 | OAK |
| +019+ | 1.4 | Orel Hershiser | 37 | LAN |
| +022+ | 1.39 | Rick Mahler | 34.7 | CIN |
| +023+ | 1.37 | Roger Clemens | 37.7 | BOS |
| +026+ | 1.33 | Steve Ontiveros | 20 | PHI |
| +027+ | 1.32 | Doyle Alexander | 31.3 | DET |
| +031+ | 1.27 | Allan Anderson | 31 | MIN |
| XXXXX | 1.19 | Erik Hanson | 32.3 | SEA |
| XXXXX | 1.18 | Tim Belcher | 34.3 | LAN |
| XXXXX | 1.15 | Dwight Gooden | 37.7 | NYN |
| XXXXX | 1.15 | Bert Blyleven | 37.3 | ANA |
| XXXXX | 1.15 | Bob Welch | 35 | OAK |
| XXXXX | 1 | Greg Swindell | 35.7 | CLE |
| XXXXX | 0.9 | Tom Browning | 36.3 | CIN |
| XXXXX | 0.89 | Larry McWilliams | 17.3 | PHI |
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