| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Scott | HOU | 6.78 | 198905230_CHN_HOU |
| Rick Reuschel | SFN | 6.51 | 198905230_WAS_SFN |
| Dwight Gooden | NYN | 5.6 | 198905230_NYN_SDN |
| Frank Viola | MIN | 3.54 | 198905240_MIN_TOR |
| Nolan Ryan | TEX | 2.74 | 198905230_KCA_TEX |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Long | CHA | -1.71 | 198905230_BAL_CHA |
| Shane Rawley | MIN | -1.29 | 198905230_MIN_TOR |
| Mike Birkbeck | MIL | -1.29 | 198905240_OAK_MIL |
| Bob Knepper | HOU | -1.07 | 198905240_CHN_HOU |
| Jay Tibbs | BAL | -0.9 | 198905240_BAL_CHA |
Based on accumulated WAA for this season up to 1989-05-24.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.12 | Orel Hershiser | 72 | LAN |
| +003+ | 2.92 | Kirk McCaskill | 64 | ANA |
| +004+ | 2.88 | Mike Morgan | 51.7 | LAN |
| +005+ | 2.82 | Mike Moore | 69 | OAK |
| +006+ | 2.75 | Jose Rijo | 57.3 | CIN |
| +008+ | 2.66 | Rick Reuschel | 74.3 | SFN |
| +012+ | 2.46 | Dwight Gooden | 74 | NYN |
| +015+ | 2.36 | John Smoltz | 67 | ATL |
| +016+ | 2.32 | Mike Bielecki | 46.3 | CHN |
| +018+ | 2.19 | Bert Blyleven | 65.3 | ANA |
| +020+ | 2.13 | Chuck Finley | 59.7 | ANA |
| +022+ | 2.01 | Tim Belcher | 61.3 | LAN |
| +024+ | 1.99 | Ed Whitson | 67.7 | SDN |
| +027+ | 1.97 | Doug Drabek | 63 | PIT |
| +032+ | 1.85 | Bryn Smith | 53.3 | WAS |
| +031+ | 1.85 | John Smiley | 69 | PIT |
| +034+ | 1.78 | Jeff Ballard | 53.3 | BAL |
| +040+ | 1.71 | Mike Scott | 74 | HOU |
| +042+ | 1.67 | Jimmy Key | 75 | TOR |
| +044+ | 1.62 | Ken Hill | 56.3 | SLN |
| +050+ | 1.5 | Rick Mahler | 72.3 | CIN |
| +052+ | 1.48 | Bret Saberhagen | 82.3 | KCA |
| +057+ | 1.4 | Mark Gubicza | 86.3 | KCA |
| +058+ | 1.39 | Tom Glavine | 55.7 | ATL |
| +067+ | 1.29 | Greg Swindell | 70.7 | CLE |
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