| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 10.46 | 198905070_CHN_LAN |
| Dwight Gooden | NYN | 5.39 | 198905070_HOU_NYN |
| Mike Scott | HOU | 4.89 | 198905090_WAS_HOU |
| Frank Viola | MIN | 3.46 | 198905090_MIN_BOS |
| Charlie Leibrandt | KCA | 3.28 | 198905070_KCA_MIL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Yett | CLE | -2.64 | 198905072_MIN_CLE |
| Fred Toliver | MIN | -1.87 | 198905072_MIN_CLE |
| Wes Gardner | BOS | -1.69 | 198905090_MIN_BOS |
| Dennis Rasmussen | SDN | -1.34 | 198905090_SDN_SLN |
| Neal Heaton | PIT | -1.15 | 198905070_PIT_SDN |
Based on accumulated WAA for this season up to 1989-05-09.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.67 | Kirk McCaskill | 44 | ANA |
| +003+ | 2.6 | Mike Morgan | 39 | LAN |
| +004+ | 2.23 | Jose Rijo | 44 | CIN |
| +011+ | 2.04 | Bert Blyleven | 51.3 | ANA |
| +015+ | 1.95 | Orel Hershiser | 54 | LAN |
| +017+ | 1.92 | Tom Glavine | 46.7 | ATL |
| +018+ | 1.9 | Chris Bosio | 51.7 | MIL |
| +019+ | 1.87 | Ed Whitson | 53.7 | SDN |
| +022+ | 1.8 | Mark Gubicza | 65 | KCA |
| +026+ | 1.72 | Mike Moore | 44.3 | OAK |
| +027+ | 1.71 | Ken Hill | 37.3 | SLN |
| +028+ | 1.69 | Erik Hanson | 46 | SEA |
| +029+ | 1.66 | Doug Drabek | 51 | PIT |
| +030+ | 1.62 | Mike Bielecki | 28.7 | CHN |
| +031+ | 1.6 | Dwight Gooden | 50.7 | NYN |
| +032+ | 1.59 | Eric King | 51 | CHA |
| +034+ | 1.56 | John Smiley | 45 | PIT |
| +035+ | 1.51 | John Cerutti | 39.7 | TOR |
| +043+ | 1.32 | Greg Swindell | 50 | CLE |
| +045+ | 1.29 | Jose DeLeon | 52 | SLN |
| +047+ | 1.26 | Dave Stewart | 48.7 | OAK |
| +049+ | 1.25 | John Dopson | 43.3 | BOS |
| XXXXX | 1.24 | John Smoltz | 51 | ATL |
| XXXXX | 1.18 | Roger Clemens | 52.7 | BOS |
| XXXXX | 1.15 | Mike Flanagan | 47.7 | TOR |
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