| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -3.62 | 198906100_OAK_TEX |
| Jerry Reuss | CHA | -3.08 | 198906090_CHA_MIN |
| Storm Davis | OAK | -1.79 | 198906100_OAK_TEX |
| Bob Knepper | HOU | -1.57 | 198906080_SDN_HOU |
| Rich Dotson | NYA | -1.03 | 198906100_BOS_NYA |
Based on accumulated WAA for this season up to 1989-06-10.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 3.58 | Chuck Finley | 85.7 | ANA |
| +005+ | 3.52 | Mike Morgan | 73.3 | LAN |
| +006+ | 3.39 | Mike Moore | 87.7 | OAK |
| +007+ | 3.36 | Ed Whitson | 97.3 | SDN |
| +012+ | 2.99 | Rick Reuschel | 94.7 | SFN |
| +014+ | 2.89 | Greg Swindell | 95.7 | CLE |
| +015+ | 2.81 | Bryn Smith | 84.3 | WAS |
| +016+ | 2.78 | Kirk McCaskill | 83.7 | ANA |
| +017+ | 2.69 | John Smoltz | 96.3 | ATL |
| +020+ | 2.63 | Mark Gubicza | 112.3 | KCA |
| +022+ | 2.59 | Bert Blyleven | 86.3 | ANA |
| +024+ | 2.57 | Mike Scott | 97.3 | HOU |
| +027+ | 2.51 | Scott Garrelts | 89 | SFN |
| +029+ | 2.39 | Mike Bielecki | 67 | CHN |
| +031+ | 2.31 | Doug Drabek | 87.7 | PIT |
| +035+ | 2.25 | Todd Burns | 45.3 | OAK |
| +038+ | 2.22 | Dennis Martinez | 97 | WAS |
| +037+ | 2.22 | Dwight Gooden | 93 | NYN |
| +043+ | 2.11 | Orel Hershiser | 97 | LAN |
| +042+ | 2.11 | Ken Hill | 75.7 | SLN |
| +044+ | 2.1 | Jose Rijo | 81.3 | CIN |
| +050+ | 2.01 | Jeff Ballard | 75.3 | BAL |
| +052+ | 2.01 | Chris Bosio | 90.3 | MIL |
| +057+ | 1.89 | Bob Welch | 89.7 | OAK |
| +058+ | 1.86 | Jose DeLeon | 100.3 | SLN |
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