| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 10.39 | 198905140_LAN_PHI |
| Mike Scott | HOU | 4.71 | 198905140_HOU_CHN |
| Frank Viola | MIN | 3.97 | 198905140_TOR_MIN |
| Dennis Martinez | WAS | 3.01 | 198905140_SFN_WAS |
| Jimmy Key | TOR | 2.96 | 198905150_CLE_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Long | CHA | -1.8 | 198905150_CHA_DET |
| Bob Knepper | HOU | -1.63 | 198905130_HOU_CHN |
| Dennis Rasmussen | SDN | -1.47 | 198905140_SDN_NYN |
| Andy Hawkins | NYA | -1.35 | 198905140_NYA_ANA |
| Jose Bautista | BAL | -1.2 | 198905140_CHA_BAL |
Based on accumulated WAA for this season up to 1989-05-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.32 | Kirk McCaskill | 52 | ANA |
| +002+ | 3.04 | Mike Morgan | 46.7 | LAN |
| +003+ | 2.8 | Mike Bielecki | 42.7 | CHN |
| +004+ | 2.72 | Orel Hershiser | 63 | LAN |
| +005+ | 2.54 | Jose Rijo | 50.3 | CIN |
| +008+ | 2.27 | Mike Moore | 53.3 | OAK |
| +011+ | 2.17 | Bert Blyleven | 58.3 | ANA |
| +015+ | 2.08 | Tom Glavine | 55.7 | ATL |
| +017+ | 1.95 | Roger Clemens | 61.7 | BOS |
| +018+ | 1.9 | Eric King | 57 | CHA |
| +019+ | 1.9 | John Smiley | 54 | PIT |
| +020+ | 1.89 | Greg Swindell | 59 | CLE |
| +026+ | 1.76 | Dwight Gooden | 58.7 | NYN |
| +028+ | 1.73 | Chris Bosio | 59.3 | MIL |
| +029+ | 1.71 | Rick Mahler | 58 | CIN |
| +030+ | 1.69 | Ken Hill | 44.7 | SLN |
| +035+ | 1.65 | Scott Garrelts | 55.3 | SFN |
| +033+ | 1.65 | John Smoltz | 58 | ATL |
| +037+ | 1.58 | Ed Whitson | 58.7 | SDN |
| +038+ | 1.55 | Mike Scott | 59.3 | HOU |
| +041+ | 1.53 | Chuck Finley | 50.7 | ANA |
| +040+ | 1.53 | Erik Hanson | 51.7 | SEA |
| +042+ | 1.52 | Doug Drabek | 57 | PIT |
| +043+ | 1.52 | Jim Deshaies | 59 | HOU |
| +046+ | 1.5 | Rick Reuschel | 58.7 | SFN |
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