| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 10.82 | 198904270_LAN_CHN |
| Frank Viola | MIN | 4.16 | 198904290_CLE_MIN |
| Mark Gubicza | KCA | 3.88 | 198904270_NYA_KCA |
| Rick Reuschel | SFN | 2.62 | 198904280_SFN_PIT |
| Dave Stewart | OAK | 1.91 | 198904290_DET_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Long | CHA | -2.04 | 198904290_CHA_NYA |
| Neal Heaton | PIT | -1.62 | 198904270_SDN_PIT |
| Todd Stottlemyre | TOR | -1.47 | 198904280_TOR_ANA |
| Tommy John | NYA | -1.26 | 198904270_NYA_KCA |
| Dennis Rasmussen | SDN | -1.19 | 198904280_SDN_CHN |
Based on accumulated WAA for this season up to 1989-04-29.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.54 | Kirk McCaskill | 36.7 | ANA |
| +003+ | 2.13 | Chris Bosio | 39.3 | MIL |
| +004+ | 1.99 | Jose Rijo | 31 | CIN |
| +009+ | 1.69 | Jeff Ballard | 30 | BAL |
| +011+ | 1.6 | Jose DeLeon | 41.3 | SLN |
| +012+ | 1.51 | Scott Terry | 35.3 | SLN |
| +016+ | 1.46 | Rick Mahler | 34.7 | CIN |
| +015+ | 1.46 | John Smiley | 36.7 | PIT |
| +020+ | 1.43 | Doug Drabek | 36.3 | PIT |
| +019+ | 1.43 | Mike Morgan | 25 | LAN |
| +021+ | 1.41 | Doyle Alexander | 39.3 | DET |
| +023+ | 1.39 | Mike Moore | 33 | OAK |
| +024+ | 1.37 | Orel Hershiser | 37 | LAN |
| +025+ | 1.37 | Roger Clemens | 37.7 | BOS |
| +026+ | 1.36 | Steve Ontiveros | 20 | PHI |
| +031+ | 1.26 | Allan Anderson | 31 | MIN |
| XXXXX | 1.2 | Tom Glavine | 38 | ATL |
| XXXXX | 1.18 | Erik Hanson | 32.3 | SEA |
| XXXXX | 1.15 | Tim Belcher | 34.3 | LAN |
| XXXXX | 1.14 | Bob Welch | 35 | OAK |
| XXXXX | 1.14 | Dwight Gooden | 37.7 | NYN |
| XXXXX | 1.13 | Bert Blyleven | 37.3 | ANA |
| XXXXX | 1.12 | Dave Stewart | 42 | OAK |
| XXXXX | 0.99 | Greg Swindell | 35.7 | CLE |
| XXXXX | 0.98 | Walt Terrell | 33.3 | SDN |
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