| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Reuschel | SFN | 7.05 | 198905280_PHI_SFN |
| Dwight Gooden | NYN | 5.73 | 198905280_NYN_LAN |
| Mike Scott | HOU | 5.44 | 198905280_HOU_PIT |
| Mark Gubicza | KCA | 3.72 | 198905270_DET_KCA |
| Frank Viola | MIN | 3.02 | 198905290_MIN_KCA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Birkbeck | MIL | -2.19 | 198905290_ANA_MIL |
| Melido Perez | CHA | -2.19 | 198905270_CHA_TOR |
| Rich Dotson | NYA | -1.52 | 198905290_SEA_NYA |
| Bob Knepper | HOU | -1.24 | 198905290_HOU_SLN |
| Bill Swift | SEA | -1.11 | 198905280_SEA_MIL |
Based on accumulated WAA for this season up to 1989-05-29.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.64 | Kirk McCaskill | 73 | ANA |
| +002+ | 3.33 | Mike Morgan | 60.3 | LAN |
| +004+ | 3.01 | Mike Moore | 74.3 | OAK |
| +007+ | 2.85 | Chuck Finley | 68.7 | ANA |
| +008+ | 2.81 | Mike Bielecki | 55.3 | CHN |
| +009+ | 2.64 | Rick Reuschel | 79.7 | SFN |
| +011+ | 2.58 | Bryn Smith | 62.3 | WAS |
| +016+ | 2.37 | Ed Whitson | 75.3 | SDN |
| +019+ | 2.3 | Dwight Gooden | 80 | NYN |
| +021+ | 2.2 | Jose Rijo | 61.3 | CIN |
| +023+ | 2.16 | John Smoltz | 74 | ATL |
| +024+ | 2.11 | Bert Blyleven | 72.3 | ANA |
| +028+ | 2.01 | Greg Swindell | 79.7 | CLE |
| +029+ | 1.98 | Orel Hershiser | 77 | LAN |
| +030+ | 1.97 | Doug Drabek | 69 | PIT |
| +034+ | 1.91 | Jeff Ballard | 60.3 | BAL |
| +037+ | 1.89 | Mark Gubicza | 95.3 | KCA |
| +040+ | 1.8 | Todd Burns | 35.7 | OAK |
| +043+ | 1.79 | Doyle Alexander | 78 | DET |
| +042+ | 1.79 | Chris Bosio | 76.7 | MIL |
| +046+ | 1.71 | Dennis Martinez | 74.3 | WAS |
| +048+ | 1.7 | Ken Hill | 64.3 | SLN |
| +047+ | 1.7 | Mike Scott | 80 | HOU |
| +050+ | 1.67 | Jimmy Key | 83 | TOR |
| +053+ | 1.64 | Bret Saberhagen | 87.3 | KCA |
_