| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 12.24 | 198905260_NYN_LAN |
| Roger Clemens | BOS | 5.85 | 198905260_ANA_BOS |
| Mark Gubicza | KCA | 3.72 | 198905270_DET_KCA |
| Jimmy Key | TOR | 3.65 | 198905260_CHA_TOR |
| Dennis Martinez | WAS | 3.33 | 198905250_WAS_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Smithson | BOS | -4.74 | 198905250_SEA_BOS |
| 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 |
Based on accumulated WAA for this season up to 1989-05-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.38 | Mike Morgan | 60.3 | LAN |
| +003+ | 2.9 | Kirk McCaskill | 64 | ANA |
| +004+ | 2.87 | Chuck Finley | 68.7 | ANA |
| +005+ | 2.79 | Mike Moore | 69 | OAK |
| +009+ | 2.63 | Rick Reuschel | 74.3 | SFN |
| +010+ | 2.6 | Bryn Smith | 62.3 | WAS |
| +014+ | 2.46 | Dwight Gooden | 74 | NYN |
| +016+ | 2.39 | Ed Whitson | 75.3 | SDN |
| +017+ | 2.31 | John Smoltz | 74 | ATL |
| +019+ | 2.26 | Mike Bielecki | 46.3 | CHN |
| +021+ | 2.19 | Jose Rijo | 61.3 | CIN |
| +023+ | 2.17 | Bert Blyleven | 65.3 | ANA |
| +026+ | 2.04 | Orel Hershiser | 77 | LAN |
| +028+ | 1.99 | Doug Drabek | 69 | PIT |
| +031+ | 1.93 | Jeff Ballard | 60.3 | BAL |
| +032+ | 1.91 | Mark Gubicza | 95.3 | KCA |
| +034+ | 1.81 | Todd Burns | 35.7 | OAK |
| +035+ | 1.78 | John Smiley | 69 | PIT |
| +039+ | 1.73 | Dennis Martinez | 74.3 | WAS |
| +044+ | 1.69 | Jimmy Key | 83 | TOR |
| +046+ | 1.68 | Scott Terry | 52.3 | SLN |
| +045+ | 1.68 | Tom Glavine | 61.7 | ATL |
| +050+ | 1.64 | Mike Scott | 74 | HOU |
| +051+ | 1.64 | Walt Terrell | 71.3 | SDN |
| +053+ | 1.6 | Scott Garrelts | 67 | SFN |
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