| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 10.39 | 198905140_LAN_PHI |
| Roger Clemens | BOS | 7.88 | 198905120_BOS_SEA |
| Dwight Gooden | NYN | 4.97 | 198905120_SDN_NYN |
| Rick Reuschel | SFN | 4.89 | 198905120_SFN_WAS |
| Mike Scott | HOU | 4.71 | 198905140_HOU_CHN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Storm Davis | OAK | -2.11 | 198905120_MIL_OAK |
| Bobby Witt | TEX | -2.02 | 198905120_TEX_KCA |
| Bob Knepper | HOU | -1.63 | 198905130_HOU_CHN |
| Ted Power | SLN | -1.58 | 198905120_CIN_SLN |
| Dennis Rasmussen | SDN | -1.47 | 198905140_SDN_NYN |
Based on accumulated WAA for this season up to 1989-05-14.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.35 | Kirk McCaskill | 52 | ANA |
| +002+ | 2.72 | Orel Hershiser | 63 | LAN |
| +003+ | 2.61 | Mike Morgan | 39 | LAN |
| +004+ | 2.54 | Jose Rijo | 50.3 | CIN |
| +007+ | 2.27 | Mike Moore | 53.3 | OAK |
| +008+ | 2.2 | Mike Bielecki | 35.7 | CHN |
| +012+ | 2.07 | Tom Glavine | 55.7 | ATL |
| +013+ | 2.03 | Bert Blyleven | 51.3 | ANA |
| +018+ | 1.95 | Roger Clemens | 61.7 | BOS |
| +022+ | 1.89 | John Smiley | 54 | PIT |
| +023+ | 1.88 | Eric King | 57 | CHA |
| +024+ | 1.87 | Greg Swindell | 59 | CLE |
| +027+ | 1.76 | Dwight Gooden | 58.7 | NYN |
| +031+ | 1.72 | Chris Bosio | 59.3 | MIL |
| +032+ | 1.71 | Rick Mahler | 58 | CIN |
| +033+ | 1.69 | Ken Hill | 44.7 | SLN |
| +036+ | 1.64 | John Smoltz | 58 | ATL |
| +037+ | 1.61 | Ed Whitson | 58.7 | SDN |
| +041+ | 1.55 | Mike Scott | 59.3 | HOU |
| +040+ | 1.55 | Chuck Finley | 50.7 | ANA |
| +042+ | 1.54 | Rick Reuschel | 58.7 | SFN |
| +044+ | 1.53 | Erik Hanson | 51.7 | SEA |
| +045+ | 1.52 | Doug Drabek | 57 | PIT |
| +046+ | 1.52 | Jim Deshaies | 59 | HOU |
| +052+ | 1.31 | Jeff Ballard | 45.7 | BAL |
_