| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -4.74 | 198907040_CHA_CLE |
| Bill Swift | SEA | -2.84 | 198907060_MIN_SEA |
| Bob Knepper | HOU | -2.71 | 198907050_NYN_HOU |
| Bruce Ruffin | PHI | -2.35 | 198907060_PHI_ATL |
| Andy Hawkins | NYA | -2.16 | 198907050_DET_NYA |
Based on accumulated WAA for this season up to 1989-07-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.01 | Rick Reuschel | 140 | SFN |
| +003+ | 4.73 | John Smoltz | 126 | ATL |
| +005+ | 4.49 | Mike Moore | 130 | OAK |
| +007+ | 4.45 | Mike Morgan | 109 | LAN |
| +008+ | 4.3 | Mark Gubicza | 153.3 | KCA |
| +010+ | 4.19 | Chuck Finley | 124.3 | ANA |
| +011+ | 4.16 | Bert Blyleven | 116.7 | ANA |
| +013+ | 4.04 | Bryn Smith | 113.3 | WAS |
| +016+ | 3.51 | Doug Drabek | 119 | PIT |
| +017+ | 3.5 | Orel Hershiser | 133 | LAN |
| +019+ | 3.46 | Bret Saberhagen | 121.3 | KCA |
| +021+ | 3.36 | Mike Scott | 137.3 | HOU |
| +025+ | 3.07 | Greg Swindell | 133.7 | CLE |
| +030+ | 2.94 | Mike Bielecki | 100.3 | CHN |
| +031+ | 2.92 | Chris Bosio | 130 | MIL |
| +034+ | 2.78 | John Cerutti | 111 | TOR |
| +035+ | 2.71 | Ed Whitson | 120.3 | SDN |
| +037+ | 2.65 | Dennis Martinez | 131.3 | WAS |
| +042+ | 2.57 | Mark Langston | 136.3 | TOT |
| +049+ | 2.47 | Todd Burns | 60.3 | OAK |
| +050+ | 2.45 | Nolan Ryan | 127 | TEX |
| +053+ | 2.34 | Bruce Hurst | 128.3 | SDN |
| +054+ | 2.32 | Kirk McCaskill | 112.3 | ANA |
| +056+ | 2.31 | Scott Garrelts | 108.3 | SFN |
| +060+ | 2.24 | John Smiley | 126.3 | PIT |
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