| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -3.73 | 198807170_MIL_TEX |
| Willie Fraser | ANA | -3.44 | 198807160_DET_ANA |
| Tom Glavine | ATL | -3.04 | 198807170_NYN_ATL |
| Ed Whitson | SDN | -2.78 | 198807160_SDN_SLN |
| Steve Trout | SEA | -2.58 | 198807180_DET_SEA |
Based on accumulated WAA for this season up to 1988-07-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 6.2 | Roger Clemens | 168.7 | BOS |
| +003+ | 6.16 | Greg Maddux | 164.7 | CHN |
| +004+ | 5.38 | Frank Viola | 146 | MIN |
| +012+ | 4.47 | Pascual Perez | 91.3 | WAS |
| +017+ | 4.12 | Mark Gubicza | 145.3 | KCA |
| +020+ | 3.88 | Dennis Martinez | 140.7 | WAS |
| +021+ | 3.81 | Orel Hershiser | 147.3 | LAN |
| +022+ | 3.71 | John Tudor | 108.3 | SLN |
| +023+ | 3.64 | David Cone | 122.7 | NYN |
| +025+ | 3.6 | Tim Leary | 125.7 | LAN |
| +026+ | 3.55 | Teddy Higuera | 119 | MIL |
| +028+ | 3.53 | Bob Walk | 128 | PIT |
| +034+ | 2.83 | Jeff Robinson | 118.3 | DET |
| +035+ | 2.76 | Jose Rijo | 101.3 | CIN |
| +037+ | 2.74 | John Smiley | 119 | PIT |
| +039+ | 2.62 | Jimmy Key | 48.3 | TOR |
| +040+ | 2.6 | Andy Hawkins | 127.7 | SDN |
| +041+ | 2.56 | Dwight Gooden | 148.7 | NYN |
| +043+ | 2.54 | Kevin Gross | 141.3 | PHI |
| +042+ | 2.54 | Larry McWilliams | 99.7 | SLN |
| +045+ | 2.52 | Allan Anderson | 105 | MIN |
| +049+ | 2.43 | John Candelaria | 118.3 | NYA |
| +051+ | 2.4 | Bob Knepper | 116 | HOU |
| +050+ | 2.4 | Danny Jackson | 135.7 | CIN |
| +052+ | 2.39 | Dave LaPoint | 132.7 | CHA |
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