| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 6.91 | 198908130_LAN_SFN |
| Bert Blyleven | ANA | 5.02 | 198908130_OAK_ANA |
| John Cerutti | TOR | 4.36 | 198908130_TOR_KCA |
| Chris Bosio | MIL | 3.97 | 198908120_MIL_CLE |
| John Smoltz | ATL | 2.85 | 198908141_ATL_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Knepper | SFN | -5.79 | 198908120_LAN_SFN |
| Bobby Witt | TEX | -4.74 | 198908130_DET_TEX |
| Melido Perez | CHA | -2.82 | 198908130_CHA_SEA |
| Wes Gardner | BOS | -2.2 | 198908120_BOS_BAL |
| Jim Clancy | HOU | -1.59 | 198908130_CIN_HOU |
Based on accumulated WAA for this season up to 1989-08-14.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 6.19 | Chris Bosio | 190.3 | MIL |
| +006+ | 5.67 | Bert Blyleven | 179.3 | ANA |
| +007+ | 5.56 | Orel Hershiser | 191 | LAN |
| +008+ | 5.51 | Mike Moore | 174.3 | OAK |
| +009+ | 5.25 | Mark Langston | 192.3 | TOT |
| +010+ | 4.93 | Chuck Finley | 168.3 | ANA |
| +018+ | 4.55 | Bret Saberhagen | 175.7 | KCA |
| +022+ | 4.33 | John Cerutti | 160.7 | TOR |
| +023+ | 4.26 | Bryn Smith | 157.7 | WAS |
| +024+ | 4.06 | John Smiley | 171.7 | PIT |
| +026+ | 4.01 | Ed Whitson | 170.3 | SDN |
| +028+ | 3.81 | Greg Swindell | 153.3 | CLE |
| +030+ | 3.73 | John Smoltz | 182.3 | ATL |
| +032+ | 3.69 | Greg Maddux | 169 | CHN |
| +031+ | 3.69 | Kevin Brown | 170.7 | TEX |
| +033+ | 3.66 | Mike Scott | 166.7 | HOU |
| +040+ | 3.52 | Mike Morgan | 135 | LAN |
| +048+ | 3.36 | Doug Drabek | 180.7 | PIT |
| +050+ | 3.26 | Sid Fernandez | 146.7 | NYN |
| +053+ | 3.08 | Mike Bielecki | 154.7 | CHN |
| +057+ | 2.92 | Todd Burns | 77 | OAK |
| +059+ | 2.82 | Tom Candiotti | 151.7 | CLE |
| +062+ | 2.79 | Mark Gubicza | 208.7 | KCA |
| +063+ | 2.79 | Joe Magrane | 172.7 | SLN |
| +065+ | 2.76 | Dennis Martinez | 177 | WAS |
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