| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 11.55 | 198905200_LAN_WAS |
| Mike Scott | HOU | 5.72 | 198905190_PIT_HOU |
| Dwight Gooden | NYN | 5 | 198905180_LAN_NYN |
| Frank Viola | MIN | 4.09 | 198905190_MIN_TEX |
| Nolan Ryan | TEX | 3.2 | 198905180_MIN_TEX |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -1.7 | 198905200_MIN_TEX |
| Andy Hawkins | NYA | -1.69 | 198905190_NYA_SEA |
| Wes Gardner | BOS | -1.43 | 198905200_BOS_OAK |
| Bill Swift | SEA | -1.21 | 198905180_MIL_SEA |
| Dennis Rasmussen | SDN | -0.99 | 198905200_SDN_PHI |
Based on accumulated WAA for this season up to 1989-05-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.62 | Kirk McCaskill | 60 | ANA |
| +002+ | 3.1 | Orel Hershiser | 72 | LAN |
| +003+ | 3.07 | Mike Morgan | 46.7 | LAN |
| +004+ | 2.83 | Mike Bielecki | 42.7 | CHN |
| +006+ | 2.74 | Jose Rijo | 57.3 | CIN |
| +008+ | 2.53 | Mike Moore | 61 | OAK |
| +012+ | 2.31 | Greg Swindell | 68 | CLE |
| +013+ | 2.26 | Mike Scott | 68.3 | HOU |
| +014+ | 2.26 | Dwight Gooden | 67 | NYN |
| +015+ | 2.21 | Rick Reuschel | 66.7 | SFN |
| +016+ | 2.18 | Bert Blyleven | 65.3 | ANA |
| +020+ | 2.12 | Chuck Finley | 59.7 | ANA |
| +022+ | 2.04 | Doug Drabek | 63 | PIT |
| +025+ | 1.99 | Tim Belcher | 61.3 | LAN |
| +026+ | 1.96 | Ed Whitson | 67.7 | SDN |
| +029+ | 1.83 | Ken Hill | 51.7 | SLN |
| +030+ | 1.77 | Jeff Ballard | 53.3 | BAL |
| +033+ | 1.73 | Jim Deshaies | 67 | HOU |
| +037+ | 1.69 | Scott Garrelts | 55.3 | SFN |
| +038+ | 1.68 | Jimmy Key | 75 | TOR |
| +039+ | 1.66 | John Smoltz | 58 | ATL |
| +044+ | 1.57 | John Smiley | 60 | PIT |
| +048+ | 1.5 | Mark Gubicza | 78.3 | KCA |
| +049+ | 1.48 | Bret Saberhagen | 75.7 | KCA |
| +051+ | 1.46 | Tom Glavine | 55.7 | ATL |
_