| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 6.91 | 198908130_LAN_SFN |
| Bert Blyleven | ANA | 5.02 | 198908130_OAK_ANA |
| Mark Langston | WAS | 4.85 | 198908110_PIT_WAS |
| John Cerutti | TOR | 4.36 | 198908130_TOR_KCA |
| Bret Saberhagen | KCA | 4.15 | 198908110_TOR_KCA |
| 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 1989-08-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 6.2 | Chris Bosio | 190.3 | MIL |
| +006+ | 5.68 | Bert Blyleven | 179.3 | ANA |
| +007+ | 5.56 | Orel Hershiser | 191 | LAN |
| +008+ | 5.51 | Mike Moore | 174.3 | OAK |
| +009+ | 5.26 | Mark Langston | 192.3 | TOT |
| +011+ | 4.93 | Chuck Finley | 168.3 | ANA |
| +018+ | 4.54 | Bret Saberhagen | 175.7 | KCA |
| +022+ | 4.45 | John Smoltz | 176.3 | ATL |
| +023+ | 4.33 | John Cerutti | 160.7 | TOR |
| +024+ | 4.26 | Bryn Smith | 157.7 | WAS |
| +025+ | 4.07 | John Smiley | 171.7 | PIT |
| +027+ | 4.01 | Ed Whitson | 170.3 | SDN |
| +029+ | 3.81 | Greg Swindell | 153.3 | CLE |
| +031+ | 3.7 | Kevin Brown | 170.7 | TEX |
| +032+ | 3.69 | Greg Maddux | 169 | CHN |
| +033+ | 3.67 | Mike Scott | 166.7 | HOU |
| +039+ | 3.52 | Mike Morgan | 135 | LAN |
| +049+ | 3.26 | Sid Fernandez | 146.7 | NYN |
| +052+ | 3.08 | Mike Bielecki | 154.7 | CHN |
| +054+ | 3.06 | Kirk McCaskill | 144.3 | ANA |
| +056+ | 2.97 | Dennis Martinez | 172 | WAS |
| +058+ | 2.92 | Todd Burns | 77 | OAK |
| +060+ | 2.82 | Tom Candiotti | 151.7 | CLE |
| +061+ | 2.81 | Doug Drabek | 171.7 | PIT |
| +064+ | 2.78 | Mark Gubicza | 208.7 | KCA |
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