| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wes Gardner | BOS | -3.28 | 198908270_DET_BOS |
| David West | MIN | -3.19 | 198908260_SEA_MIN |
| Bob Forsch | HOU | -2 | 198908270_SLN_HOU |
| Don Carman | PHI | -1.91 | 198908270_PHI_LAN |
| Andy Hawkins | NYA | -1.86 | 198908280_OAK_NYA |
Based on accumulated WAA for this season up to 1989-08-28.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 6.47 | Orel Hershiser | 214 | LAN |
| +004+ | 6.41 | Mike Moore | 195.3 | OAK |
| +006+ | 6.2 | Bert Blyleven | 195.7 | ANA |
| +009+ | 5.51 | Chris Bosio | 210.3 | MIL |
| +010+ | 5.49 | Bret Saberhagen | 199.7 | KCA |
| +016+ | 4.95 | Chuck Finley | 176.3 | ANA |
| +017+ | 4.86 | Ed Whitson | 193 | SDN |
| +019+ | 4.66 | John Smiley | 187.7 | PIT |
| +023+ | 4.52 | Scott Garrelts | 147.7 | SFN |
| +026+ | 4.3 | Bryn Smith | 180.3 | WAS |
| +027+ | 4.16 | Mark Gubicza | 225.7 | KCA |
| +029+ | 3.99 | Rick Reuschel | 168.3 | SFN |
| +030+ | 3.95 | Mark Langston | 211.3 | TOT |
| +032+ | 3.91 | Greg Maddux | 198 | CHN |
| +033+ | 3.87 | Joe Magrane | 190.3 | SLN |
| +035+ | 3.77 | Doug Drabek | 197 | PIT |
| +036+ | 3.76 | Bob Welch | 172 | OAK |
| +038+ | 3.68 | John Smoltz | 197.7 | ATL |
| +040+ | 3.61 | Sid Fernandez | 166.3 | NYN |
| +042+ | 3.6 | Kirk McCaskill | 165.7 | ANA |
| +047+ | 3.43 | John Cerutti | 173.7 | TOR |
| +052+ | 3.32 | Mike Morgan | 141.7 | LAN |
| +055+ | 3.3 | Bruce Hurst | 199.3 | SDN |
| +059+ | 3.16 | Tom Browning | 215.3 | CIN |
| +061+ | 3.09 | Mike Bielecki | 173.7 | CHN |
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