| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 9.35 | 198905170_BOS_ANA |
| Mike Scott | HOU | 5.72 | 198905190_PIT_HOU |
| Rick Reuschel | SFN | 5.28 | 198905170_SFN_PHI |
| Dwight Gooden | NYN | 5 | 198905180_LAN_NYN |
| Frank Viola | MIN | 4.09 | 198905190_MIN_TEX |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Storm Davis | OAK | -2.14 | 198905170_NYA_OAK |
| Jerry Reuss | CHA | -1.84 | 198905170_CHA_DET |
| Andy Hawkins | NYA | -1.69 | 198905190_NYA_SEA |
| Bill Swift | SEA | -1.21 | 198905180_MIL_SEA |
| Mike Birkbeck | MIL | -1.1 | 198905170_MIL_SEA |
Based on accumulated WAA for this season up to 1989-05-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.62 | Kirk McCaskill | 60 | ANA |
| +002+ | 3.09 | Mike Morgan | 46.7 | LAN |
| +003+ | 2.83 | Mike Bielecki | 42.7 | CHN |
| +004+ | 2.78 | Orel Hershiser | 63 | LAN |
| +005+ | 2.74 | Jose Rijo | 57.3 | CIN |
| +008+ | 2.53 | Mike Moore | 61 | OAK |
| +011+ | 2.31 | Mike Scott | 68.3 | HOU |
| +013+ | 2.29 | Greg Swindell | 68 | CLE |
| +014+ | 2.26 | Dwight Gooden | 67 | NYN |
| +015+ | 2.22 | Bert Blyleven | 58.3 | ANA |
| +016+ | 2.22 | Rick Reuschel | 66.7 | SFN |
| +019+ | 2.12 | Chuck Finley | 59.7 | ANA |
| +022+ | 2.01 | Tim Belcher | 61.3 | LAN |
| +024+ | 1.97 | Ed Whitson | 67.7 | SDN |
| +027+ | 1.89 | Ken Hill | 51.7 | SLN |
| +030+ | 1.78 | Jim Deshaies | 67 | HOU |
| +033+ | 1.72 | John Smoltz | 58 | ATL |
| +036+ | 1.69 | Scott Garrelts | 55.3 | SFN |
| +040+ | 1.62 | John Smiley | 60 | PIT |
| +041+ | 1.57 | Doug Drabek | 57 | PIT |
| +043+ | 1.52 | Tom Glavine | 55.7 | ATL |
| +046+ | 1.48 | Mark Gubicza | 78.3 | KCA |
| +047+ | 1.47 | Bret Saberhagen | 75.7 | KCA |
| +057+ | 1.34 | Jeff Ballard | 45.7 | BAL |
| +061+ | 1.28 | Bryn Smith | 44.3 | WAS |
_