| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.16 | 198907050_LAN_SLN |
| Mark Gubicza | KCA | 5.99 | 198907030_KCA_OAK |
| Mike Scott | HOU | 5.6 | 198907040_NYN_HOU |
| Dennis Martinez | WAS | 4.61 | 198907050_WAS_ATL |
| Don Robinson | SFN | 2.46 | 198907040_SFN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -4.74 | 198907040_CHA_CLE |
| Mike Smithson | BOS | -3.33 | 198907030_BOS_TOR |
| Bob Knepper | HOU | -2.71 | 198907050_NYN_HOU |
| Andy Hawkins | NYA | -2.16 | 198907050_DET_NYA |
| Kevin Gross | WAS | -1.26 | 198907040_WAS_ATL |
Based on accumulated WAA for this season up to 1989-07-05.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 4.73 | John Smoltz | 126 | ATL |
| +004+ | 4.64 | Rick Reuschel | 133 | SFN |
| +005+ | 4.44 | Mike Morgan | 109 | LAN |
| +008+ | 4.29 | Mark Gubicza | 153.3 | KCA |
| +010+ | 4.19 | Chuck Finley | 124.3 | ANA |
| +011+ | 4.16 | Bert Blyleven | 116.7 | ANA |
| +012+ | 4.04 | Bryn Smith | 113.3 | WAS |
| +014+ | 3.89 | Mike Moore | 123 | OAK |
| +016+ | 3.53 | Doug Drabek | 119 | PIT |
| +017+ | 3.49 | Orel Hershiser | 133 | LAN |
| +018+ | 3.44 | Bret Saberhagen | 121.3 | KCA |
| +019+ | 3.36 | Mike Scott | 137.3 | HOU |
| +023+ | 3.07 | Greg Swindell | 133.7 | CLE |
| +030+ | 2.94 | Mike Bielecki | 100.3 | CHN |
| +031+ | 2.91 | Chris Bosio | 130 | MIL |
| +033+ | 2.78 | John Cerutti | 111 | TOR |
| +036+ | 2.7 | Ed Whitson | 120.3 | SDN |
| +037+ | 2.65 | Dennis Martinez | 131.3 | WAS |
| +041+ | 2.57 | Mark Langston | 136.3 | TOT |
| +044+ | 2.51 | Todd Burns | 58.3 | OAK |
| +051+ | 2.33 | Bruce Hurst | 128.3 | SDN |
| +053+ | 2.32 | Scott Garrelts | 108.3 | SFN |
| +060+ | 2.22 | Roger Clemens | 132.3 | BOS |
| +064+ | 2.2 | Greg Maddux | 113.7 | CHN |
| +069+ | 2.06 | Jose Rijo | 109.3 | CIN |
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