| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 9.35 | 198905170_BOS_ANA |
| Rick Reuschel | SFN | 5.28 | 198905170_SFN_PHI |
| Dwight Gooden | NYN | 5 | 198905180_LAN_NYN |
| Mark Gubicza | KCA | 3.36 | 198905160_KCA_MIN |
| Nolan Ryan | TEX | 3.2 | 198905180_MIN_TEX |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Smithson | BOS | -4.23 | 198905160_BOS_ANA |
| Storm Davis | OAK | -2.14 | 198905170_NYA_OAK |
| Jerry Reuss | CHA | -1.84 | 198905170_CHA_DET |
| Rich Yett | CLE | -1.8 | 198905160_CLE_TOR |
| Tommy John | NYA | -1.6 | 198905180_NYA_OAK |
Based on accumulated WAA for this season up to 1989-05-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.63 | Kirk McCaskill | 60 | ANA |
| +002+ | 3.09 | Mike Morgan | 46.7 | LAN |
| +003+ | 2.84 | Mike Bielecki | 42.7 | CHN |
| +005+ | 2.78 | Orel Hershiser | 63 | LAN |
| +006+ | 2.75 | Jose Rijo | 57.3 | CIN |
| +010+ | 2.31 | Mike Moore | 53.3 | OAK |
| +011+ | 2.3 | Greg Swindell | 68 | CLE |
| +012+ | 2.29 | Dwight Gooden | 67 | NYN |
| +014+ | 2.23 | Bert Blyleven | 58.3 | ANA |
| +013+ | 2.23 | Rick Reuschel | 66.7 | SFN |
| +021+ | 1.96 | Eric King | 57 | CHA |
| +025+ | 1.78 | Jim Deshaies | 67 | HOU |
| +028+ | 1.73 | John Smoltz | 58 | ATL |
| +030+ | 1.71 | Ken Hill | 44.7 | SLN |
| +031+ | 1.7 | Scott Garrelts | 55.3 | SFN |
| +034+ | 1.63 | Ed Whitson | 58.7 | SDN |
| +036+ | 1.61 | John Smiley | 60 | PIT |
| +037+ | 1.57 | Chuck Finley | 50.7 | ANA |
| +038+ | 1.57 | Erik Hanson | 51.7 | SEA |
| +040+ | 1.56 | Doug Drabek | 57 | PIT |
| +039+ | 1.56 | Mike Scott | 59.3 | HOU |
| +044+ | 1.53 | Tom Glavine | 55.7 | ATL |
| +046+ | 1.48 | Mark Gubicza | 78.3 | KCA |
| +058+ | 1.34 | Jeff Ballard | 45.7 | BAL |
| +060+ | 1.29 | Bryn Smith | 44.3 | WAS |
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