| Starter | Tm | Tier | Game |
|---|---|---|---|
| Oil Can Boyd | BOS | -3.91 | 198904260_CHA_BOS |
| Mike Campbell | SEA | -3.34 | 198904260_TOR_SEA |
| Rich Yett | CLE | -3.3 | 198904250_TEX_CLE |
| Jose Bautista | BAL | -2.34 | 198904260_BAL_OAK |
| Storm Davis | OAK | -1.89 | 198904250_TOR_OAK |
Based on accumulated WAA for this season up to 1989-04-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.12 | Chris Bosio | 39.3 | MIL |
| +006+ | 1.77 | Kirk McCaskill | 27.7 | ANA |
| +007+ | 1.73 | Erik Hanson | 29 | SEA |
| +008+ | 1.66 | Jeff Ballard | 30 | BAL |
| +009+ | 1.63 | Jose DeLeon | 41.3 | SLN |
| +010+ | 1.58 | Tom Glavine | 33 | ATL |
| +011+ | 1.54 | Scott Terry | 35.3 | SLN |
| +017+ | 1.43 | Doug Drabek | 36.3 | PIT |
| +016+ | 1.43 | Mike Morgan | 25 | LAN |
| +018+ | 1.42 | Jose Rijo | 25 | CIN |
| +019+ | 1.38 | Roger Clemens | 37.7 | BOS |
| +020+ | 1.37 | Rick Mahler | 34.7 | CIN |
| +022+ | 1.37 | Orel Hershiser | 37 | LAN |
| +023+ | 1.33 | Steve Ontiveros | 20 | PHI |
| +025+ | 1.3 | Doyle Alexander | 31.3 | DET |
| +029+ | 1.27 | Allan Anderson | 31 | MIN |
| XXXXX | 1.15 | Tim Belcher | 34.3 | LAN |
| XXXXX | 1.14 | Dwight Gooden | 37.7 | NYN |
| XXXXX | 1.14 | Bert Blyleven | 37.3 | ANA |
| XXXXX | 1.14 | Bob Welch | 35 | OAK |
| XXXXX | 0.99 | Greg Swindell | 35.7 | CLE |
| XXXXX | 0.97 | Sid Fernandez | 18.7 | NYN |
| XXXXX | 0.91 | John Smoltz | 27.7 | ATL |
| XXXXX | 0.88 | Jamie Moyer | 27.7 | TEX |
| XXXXX | 0.88 | Tom Browning | 36.3 | CIN |
_