| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 9.16 | 198905020_PIT_LAN |
| Roger Clemens | BOS | 9.01 | 198904300_BOS_TEX |
| Dwight Gooden | NYN | 4.34 | 198905010_NYN_ATL |
| 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 |
| Fred Toliver | MIN | -2.83 | 198905020_BOS_MIN |
| Jerry Reuss | CHA | -2.16 | 198905010_MIL_CHA |
| Mike Birkbeck | MIL | -2.08 | 198904300_MIL_KCA |
Based on accumulated WAA for this season up to 1989-05-02.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.53 | Kirk McCaskill | 36.7 | ANA |
| +002+ | 2.41 | Jose DeLeon | 50.3 | SLN |
| +004+ | 2.17 | Orel Hershiser | 46 | LAN |
| +005+ | 2.13 | Mike Morgan | 33 | LAN |
| +008+ | 2.02 | Jose Rijo | 31 | CIN |
| +009+ | 2.01 | Doug Drabek | 45 | PIT |
| +010+ | 1.89 | Jeff Ballard | 37 | BAL |
| +011+ | 1.78 | Dwight Gooden | 44.7 | NYN |
| +012+ | 1.75 | John Cerutti | 32 | TOR |
| +016+ | 1.66 | Roger Clemens | 45.7 | BOS |
| +019+ | 1.58 | Chris Bosio | 46.7 | MIL |
| +022+ | 1.5 | John Smiley | 36.7 | PIT |
| +023+ | 1.45 | Doyle Alexander | 39.3 | DET |
| +027+ | 1.42 | Ed Whitson | 45.3 | SDN |
| +028+ | 1.4 | Mike Moore | 33 | OAK |
| +031+ | 1.37 | Steve Ontiveros | 20 | PHI |
| +036+ | 1.28 | Nolan Ryan | 35 | TEX |
| +038+ | 1.25 | Eric King | 44 | CHA |
| XXXXX | 1.23 | Tom Glavine | 38 | ATL |
| XXXXX | 1.18 | Erik Hanson | 32.3 | SEA |
| XXXXX | 1.14 | Dave Stewart | 42 | OAK |
| XXXXX | 1.12 | Bert Blyleven | 37.3 | ANA |
| XXXXX | 1.07 | Mark Gubicza | 56 | KCA |
| XXXXX | 1.03 | Greg Swindell | 43 | CLE |
| XXXXX | 1.01 | Walt Terrell | 33.3 | SDN |
_