| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 8.81 | 198906300_PIT_LAN |
| Mark Gubicza | KCA | 7.56 | 198906280_SEA_KCA |
| Mike Scott | HOU | 5.73 | 198906290_HOU_WAS |
| Dennis Martinez | WAS | 3.77 | 198906300_HOU_WAS |
| Don Robinson | SFN | 3.69 | 198906280_SFN_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -4.69 | 198906290_KCA_CHA |
| Bill Swift | SEA | -3.14 | 198906300_SEA_TEX |
| Mike Smithson | BOS | -2.48 | 198906280_BOS_MIL |
| Andy Hawkins | NYA | -2.1 | 198906300_MIL_NYA |
| Bob Knepper | HOU | -1.96 | 198906300_HOU_WAS |
Based on accumulated WAA for this season up to 1989-06-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 4.54 | Rick Reuschel | 124 | SFN |
| +004+ | 4.41 | Mike Morgan | 101 | LAN |
| +007+ | 4.12 | Mike Moore | 117.3 | OAK |
| +008+ | 3.97 | John Smoltz | 116.7 | ATL |
| +010+ | 3.69 | Bryn Smith | 106.3 | WAS |
| +011+ | 3.67 | Chuck Finley | 115.3 | ANA |
| +013+ | 3.65 | Doug Drabek | 112.7 | PIT |
| +012+ | 3.65 | Mark Gubicza | 145.3 | KCA |
| +014+ | 3.6 | Bert Blyleven | 109.7 | ANA |
| +015+ | 3.42 | Orel Hershiser | 127 | LAN |
| +017+ | 3.35 | Mike Scott | 129.3 | HOU |
| +019+ | 3.31 | Dennis Martinez | 126.3 | WAS |
| +025+ | 3 | Ed Whitson | 116.3 | SDN |
| +030+ | 2.9 | Greg Swindell | 126 | CLE |
| +031+ | 2.88 | Bret Saberhagen | 114.3 | KCA |
| +036+ | 2.72 | Chris Bosio | 122.3 | MIL |
| +039+ | 2.67 | John Cerutti | 104 | TOR |
| +040+ | 2.56 | Todd Burns | 56 | OAK |
| +046+ | 2.46 | Mike Bielecki | 94.3 | CHN |
| +045+ | 2.46 | Bob Welch | 98.3 | OAK |
| +049+ | 2.36 | Scott Garrelts | 108.3 | SFN |
| +050+ | 2.35 | Kevin Brown | 108.7 | TEX |
| +061+ | 2.05 | Dwight Gooden | 110 | NYN |
| +065+ | 2 | Don Robinson | 109 | SFN |
| +066+ | 1.99 | Bruce Hurst | 119.3 | SDN |
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