| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Gubicza | KCA | 5.99 | 198907030_KCA_OAK |
| Mike Scott | HOU | 5.6 | 198907040_NYN_HOU |
| Doug Drabek | PIT | 5.4 | 198907020_PIT_LAN |
| Roger Clemens | BOS | 4.83 | 198907020_BOS_TOR |
| Bryn Smith | WAS | 3.14 | 198907020_HOU_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -4.74 | 198907040_CHA_CLE |
| Mike Smithson | BOS | -3.33 | 198907030_BOS_TOR |
| Storm Davis | OAK | -1.94 | 198907020_OAK_CLE |
| Kevin Gross | WAS | -1.26 | 198907040_WAS_ATL |
| Dave Schmidt | BAL | -1.02 | 198907040_BAL_TOR |
Based on accumulated WAA for this season up to 1989-07-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 4.71 | John Smoltz | 126 | ATL |
| +003+ | 4.62 | Rick Reuschel | 133 | SFN |
| +006+ | 4.41 | Mike Morgan | 109 | LAN |
| +008+ | 4.3 | Mark Gubicza | 153.3 | KCA |
| +010+ | 4.15 | Bert Blyleven | 116.7 | ANA |
| +011+ | 4.03 | Bryn Smith | 113.3 | WAS |
| +013+ | 3.9 | Mike Moore | 123 | OAK |
| +015+ | 3.61 | Chuck Finley | 115.3 | ANA |
| +016+ | 3.51 | Doug Drabek | 119 | PIT |
| +017+ | 3.46 | Bret Saberhagen | 121.3 | KCA |
| +018+ | 3.38 | Orel Hershiser | 127 | LAN |
| +020+ | 3.34 | Mike Scott | 137.3 | HOU |
| +021+ | 3.25 | Dennis Martinez | 126.3 | WAS |
| +029+ | 2.93 | Mike Bielecki | 100.3 | CHN |
| +030+ | 2.9 | Chris Bosio | 130 | MIL |
| +032+ | 2.81 | Greg Swindell | 126 | CLE |
| +033+ | 2.76 | John Cerutti | 111 | TOR |
| +035+ | 2.73 | Todd Burns | 58.3 | OAK |
| +038+ | 2.67 | Ed Whitson | 120.3 | SDN |
| +042+ | 2.56 | Mark Langston | 136.3 | TOT |
| +051+ | 2.4 | Bob Welch | 98.3 | OAK |
| +055+ | 2.31 | Scott Garrelts | 108.3 | SFN |
| +058+ | 2.3 | Bruce Hurst | 128.3 | SDN |
| +063+ | 2.21 | Roger Clemens | 132.3 | BOS |
| +066+ | 2.18 | Greg Maddux | 113.7 | CHN |
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