| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 9.01 | 198904300_BOS_TEX |
| Dwight Gooden | NYN | 4.34 | 198905010_NYN_ATL |
| Frank Viola | MIN | 4.16 | 198904290_CLE_MIN |
| Mike Scott | HOU | 4.13 | 198904300_NYN_HOU |
| Pascual Perez | WAS | 3.3 | 198905010_CIN_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Yett | CLE | -3.49 | 198905010_CLE_TEX |
| Oil Can Boyd | BOS | -3.43 | 198905010_BOS_MIN |
| Jerry Reuss | CHA | -2.16 | 198905010_MIL_CHA |
| Mike Birkbeck | MIL | -2.08 | 198904300_MIL_KCA |
| Mike Witt | ANA | -1.55 | 198904300_TOR_ANA |
Based on accumulated WAA for this season up to 1989-05-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.51 | Kirk McCaskill | 36.7 | ANA |
| +002+ | 2.37 | Jose DeLeon | 50.3 | SLN |
| +004+ | 2.17 | Chris Bosio | 39.3 | MIL |
| +006+ | 2.11 | Mike Morgan | 33 | LAN |
| +007+ | 1.99 | Jose Rijo | 31 | CIN |
| +008+ | 1.97 | Doug Drabek | 45 | PIT |
| +009+ | 1.87 | Jeff Ballard | 37 | BAL |
| +010+ | 1.76 | Dwight Gooden | 44.7 | NYN |
| +011+ | 1.73 | John Cerutti | 32 | TOR |
| +015+ | 1.63 | Roger Clemens | 45.7 | BOS |
| +017+ | 1.52 | Scott Terry | 35.3 | SLN |
| +018+ | 1.47 | John Smiley | 36.7 | PIT |
| +023+ | 1.42 | Doyle Alexander | 39.3 | DET |
| +026+ | 1.39 | Mike Moore | 33 | OAK |
| +024+ | 1.39 | Orel Hershiser | 37 | LAN |
| +030+ | 1.36 | Steve Ontiveros | 20 | PHI |
| +036+ | 1.26 | Nolan Ryan | 35 | TEX |
| XXXXX | 1.22 | Tom Glavine | 38 | ATL |
| XXXXX | 1.17 | Erik Hanson | 32.3 | SEA |
| XXXXX | 1.14 | Bob Welch | 35 | OAK |
| XXXXX | 1.12 | Dave Stewart | 42 | OAK |
| XXXXX | 1.1 | Bert Blyleven | 37.3 | ANA |
| XXXXX | 1 | Greg Swindell | 35.7 | CLE |
| XXXXX | 0.99 | Walt Terrell | 33.3 | SDN |
| XXXXX | 0.96 | Tim Belcher | 39.3 | LAN |
_