| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 9.03 | 198905310_WAS_LAN |
| Roger Clemens | BOS | 6.01 | 198905310_OAK_BOS |
| Dennis Martinez | WAS | 4.27 | 198905300_WAS_LAN |
| Jimmy Key | TOR | 3.64 | 198905310_TOR_CLE |
| Doug Drabek | PIT | 3.05 | 198905300_CIN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Smithson | BOS | -3.32 | 198905300_OAK_BOS |
| Bobby Witt | TEX | -3.15 | 198905310_TEX_BAL |
| Andy Hawkins | NYA | -2.71 | 198905310_SEA_NYA |
| Mike Birkbeck | MIL | -2.19 | 198905290_ANA_MIL |
| Rich Yett | CLE | -1.93 | 198905310_TOR_CLE |
Based on accumulated WAA for this season up to 1989-05-31.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.66 | Kirk McCaskill | 73 | ANA |
| +004+ | 3.34 | Mike Morgan | 60.3 | LAN |
| +005+ | 3.01 | Mike Moore | 74.3 | OAK |
| +006+ | 2.88 | Chuck Finley | 68.7 | ANA |
| +007+ | 2.83 | Mike Bielecki | 55.3 | CHN |
| +009+ | 2.69 | Bryn Smith | 68.3 | WAS |
| +010+ | 2.68 | Doug Drabek | 77.3 | PIT |
| +012+ | 2.64 | Rick Reuschel | 79.7 | SFN |
| +011+ | 2.64 | Ed Whitson | 83.3 | SDN |
| +019+ | 2.42 | John Smoltz | 82 | ATL |
| +020+ | 2.35 | Jeff Ballard | 65.3 | BAL |
| +021+ | 2.31 | Dwight Gooden | 80 | NYN |
| +023+ | 2.21 | Jose Rijo | 68.7 | CIN |
| +027+ | 2.14 | Bert Blyleven | 72.3 | ANA |
| +030+ | 2.04 | Scott Garrelts | 75 | SFN |
| +031+ | 2.02 | Greg Swindell | 79.7 | CLE |
| +034+ | 1.96 | Mark Gubicza | 95.3 | KCA |
| +035+ | 1.95 | Orel Hershiser | 84 | LAN |
| +042+ | 1.86 | Todd Burns | 41.3 | OAK |
| +044+ | 1.8 | Chris Bosio | 76.7 | MIL |
| +045+ | 1.79 | Doyle Alexander | 78 | DET |
| +049+ | 1.72 | Mike Scott | 80 | HOU |
| +050+ | 1.72 | Ken Hill | 64.3 | SLN |
| +051+ | 1.7 | Bret Saberhagen | 87.3 | KCA |
| +052+ | 1.65 | Dennis Martinez | 80.7 | WAS |
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