| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 12.24 | 198905260_NYN_LAN |
| Rick Reuschel | SFN | 7.05 | 198905280_PHI_SFN |
| Roger Clemens | BOS | 5.85 | 198905260_ANA_BOS |
| Dwight Gooden | NYN | 5.73 | 198905280_NYN_LAN |
| Mike Scott | HOU | 5.44 | 198905280_HOU_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -3.13 | 198905260_TEX_MIN |
| Melido Perez | CHA | -2.19 | 198905270_CHA_TOR |
| Andy Hawkins | NYA | -2.15 | 198905260_OAK_NYA |
| Rich Yett | CLE | -1.48 | 198905260_BAL_CLE |
| Bill Swift | SEA | -1.11 | 198905280_SEA_MIL |
Based on accumulated WAA for this season up to 1989-05-28.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.66 | Kirk McCaskill | 73 | ANA |
| +002+ | 3.34 | Mike Morgan | 60.3 | LAN |
| +004+ | 3.04 | Mike Moore | 74.3 | OAK |
| +006+ | 2.87 | Chuck Finley | 68.7 | ANA |
| +007+ | 2.82 | Mike Bielecki | 55.3 | CHN |
| +009+ | 2.66 | Rick Reuschel | 79.7 | SFN |
| +011+ | 2.6 | Bryn Smith | 62.3 | WAS |
| +017+ | 2.39 | Ed Whitson | 75.3 | SDN |
| +019+ | 2.3 | Dwight Gooden | 80 | NYN |
| +021+ | 2.2 | Jose Rijo | 61.3 | CIN |
| +022+ | 2.18 | John Smoltz | 74 | ATL |
| +024+ | 2.17 | Bert Blyleven | 65.3 | ANA |
| +025+ | 2.03 | Greg Swindell | 79.7 | CLE |
| +027+ | 2 | Orel Hershiser | 77 | LAN |
| +028+ | 1.99 | Doug Drabek | 69 | PIT |
| +032+ | 1.93 | Jeff Ballard | 60.3 | BAL |
| +035+ | 1.91 | Mark Gubicza | 95.3 | KCA |
| +040+ | 1.81 | Todd Burns | 35.7 | OAK |
| +039+ | 1.81 | Chris Bosio | 76.7 | MIL |
| +043+ | 1.73 | Dennis Martinez | 74.3 | WAS |
| +046+ | 1.72 | Mike Scott | 80 | HOU |
| +048+ | 1.67 | Jimmy Key | 83 | TOR |
| +052+ | 1.64 | Walt Terrell | 71.3 | SDN |
| +054+ | 1.6 | Scott Garrelts | 67 | SFN |
| +056+ | 1.57 | Scott Terry | 52.3 | SLN |
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