| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 11.55 | 198905200_LAN_WAS |
| Roger Clemens | BOS | 6.61 | 198905210_BOS_OAK |
| Mark Gubicza | KCA | 3.93 | 198905210_KCA_DET |
| Jimmy Key | TOR | 3.08 | 198905200_TOR_CHA |
| Dennis Martinez | WAS | 2.83 | 198905200_LAN_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Yett | CLE | -2 | 198905210_CLE_BAL |
| Melido Perez | CHA | -1.95 | 198905210_TOR_CHA |
| Bobby Witt | TEX | -1.7 | 198905200_MIN_TEX |
| Wes Gardner | BOS | -1.43 | 198905200_BOS_OAK |
| Dennis Rasmussen | SDN | -0.99 | 198905200_SDN_PHI |
Based on accumulated WAA for this season up to 1989-05-22.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.12 | Orel Hershiser | 72 | LAN |
| +003+ | 2.91 | Kirk McCaskill | 64 | ANA |
| +004+ | 2.88 | Mike Morgan | 51.7 | LAN |
| +005+ | 2.75 | Jose Rijo | 57.3 | CIN |
| +008+ | 2.53 | Mike Moore | 61 | OAK |
| +011+ | 2.43 | John Smoltz | 67 | ATL |
| +012+ | 2.31 | Mike Bielecki | 46.3 | CHN |
| +013+ | 2.31 | Greg Swindell | 68 | CLE |
| +014+ | 2.28 | Mike Scott | 68.3 | HOU |
| +015+ | 2.27 | Dwight Gooden | 67 | NYN |
| +016+ | 2.22 | Rick Reuschel | 66.7 | SFN |
| +018+ | 2.19 | Bert Blyleven | 65.3 | ANA |
| +021+ | 2.13 | Chuck Finley | 59.7 | ANA |
| +023+ | 2.04 | Doug Drabek | 63 | PIT |
| +024+ | 2.01 | Tim Belcher | 61.3 | LAN |
| +025+ | 1.99 | Ed Whitson | 67.7 | SDN |
| +031+ | 1.83 | Bryn Smith | 53.3 | WAS |
| +032+ | 1.83 | Ken Hill | 51.7 | SLN |
| +033+ | 1.78 | Jeff Ballard | 53.3 | BAL |
| +037+ | 1.68 | Jimmy Key | 75 | TOR |
| +041+ | 1.58 | John Smiley | 60 | PIT |
| +045+ | 1.53 | Bret Saberhagen | 75.7 | KCA |
| +049+ | 1.49 | Rick Mahler | 72.3 | CIN |
| +056+ | 1.45 | Tom Glavine | 55.7 | ATL |
| +058+ | 1.38 | Mark Gubicza | 86.3 | KCA |
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