| Starter | Tm | Tier | Game |
|---|---|---|---|
| Roger Clemens | BOS | 7.88 | 198905120_BOS_SEA |
| Mark Gubicza | KCA | 5.16 | 198905110_TEX_KCA |
| Dwight Gooden | NYN | 4.97 | 198905120_SDN_NYN |
| Rick Reuschel | SFN | 4.89 | 198905120_SFN_WAS |
| Nolan Ryan | TEX | 2.94 | 198905110_TEX_KCA |
| 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 |
| Mike Birkbeck | MIL | -1.37 | 198905120_MIL_OAK |
Based on accumulated WAA for this season up to 1989-05-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.35 | Kirk McCaskill | 52 | ANA |
| +002+ | 2.62 | Mike Morgan | 39 | LAN |
| +003+ | 2.54 | Jose Rijo | 50.3 | CIN |
| +006+ | 2.21 | Mike Bielecki | 35.7 | CHN |
| +008+ | 2.08 | Tom Glavine | 55.7 | ATL |
| +009+ | 2.04 | Bert Blyleven | 51.3 | ANA |
| +015+ | 1.98 | Orel Hershiser | 54 | LAN |
| +017+ | 1.93 | Roger Clemens | 61.7 | BOS |
| +021+ | 1.9 | John Smiley | 54 | PIT |
| +022+ | 1.89 | Eric King | 57 | CHA |
| +023+ | 1.88 | Greg Swindell | 59 | CLE |
| +027+ | 1.76 | Dwight Gooden | 58.7 | NYN |
| +030+ | 1.73 | Chris Bosio | 59.3 | MIL |
| +031+ | 1.72 | Rick Mahler | 58 | CIN |
| +032+ | 1.72 | Mike Moore | 44.3 | OAK |
| +033+ | 1.7 | Ken Hill | 37.3 | SLN |
| +035+ | 1.68 | Erik Hanson | 46 | SEA |
| +037+ | 1.64 | Doug Drabek | 51 | PIT |
| +039+ | 1.61 | Ed Whitson | 58.7 | SDN |
| +042+ | 1.53 | Jim Deshaies | 59 | HOU |
| +041+ | 1.53 | Rick Reuschel | 58.7 | SFN |
| +050+ | 1.31 | Jeff Ballard | 45.7 | BAL |
| +052+ | 1.25 | John Smoltz | 51 | ATL |
| XXXXX | 1.21 | Tim Belcher | 52.3 | LAN |
| XXXXX | 1.2 | John Cerutti | 45.7 | TOR |
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