| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Moore | OAK | 5.42 | 198908250_OAK_KCA |
| Bert Blyleven | ANA | 4.77 | 198908240_ANA_KCA |
| Mark Langston | WAS | 4.04 | 198908260_WAS_SFN |
| Bret Saberhagen | KCA | 3.65 | 198908260_OAK_KCA |
| Scott Garrelts | SFN | 3.23 | 198908260_WAS_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.42 | 198908250_ANA_TEX |
| Melido Perez | CHA | -4.32 | 198908240_CHA_MIN |
| Dave Schmidt | BAL | -3.94 | 198908242_BAL_NYA |
| David West | MIN | -3.19 | 198908260_SEA_MIN |
| Randy Johnson | SEA | -1.53 | 198908250_SEA_MIN |
Based on accumulated WAA for this season up to 1989-08-26.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 6.4 | Mike Moore | 195.3 | OAK |
| +005+ | 6.18 | Bert Blyleven | 195.7 | ANA |
| +006+ | 6.13 | Chris Bosio | 205.7 | MIL |
| +007+ | 5.99 | Orel Hershiser | 206 | LAN |
| +010+ | 5.47 | Bret Saberhagen | 199.7 | KCA |
| +014+ | 5.05 | Rick Reuschel | 166 | SFN |
| +016+ | 4.93 | Chuck Finley | 176.3 | ANA |
| +018+ | 4.85 | Ed Whitson | 193 | SDN |
| +020+ | 4.63 | John Smiley | 187.7 | PIT |
| +023+ | 4.52 | Scott Garrelts | 147.7 | SFN |
| +027+ | 4.29 | Bryn Smith | 173 | WAS |
| +028+ | 4.14 | Mark Gubicza | 225.7 | KCA |
| +030+ | 3.93 | Mark Langston | 211.3 | TOT |
| +032+ | 3.84 | Joe Magrane | 190.3 | SLN |
| +035+ | 3.73 | Doug Drabek | 197 | PIT |
| +036+ | 3.68 | John Smoltz | 197.7 | ATL |
| +037+ | 3.59 | Kirk McCaskill | 165.7 | ANA |
| +038+ | 3.59 | Sid Fernandez | 166.3 | NYN |
| +050+ | 3.31 | Mike Morgan | 141.7 | LAN |
| +051+ | 3.29 | Bruce Hurst | 199.3 | SDN |
| +056+ | 3.14 | Greg Maddux | 189 | CHN |
| +055+ | 3.14 | John Cerutti | 168 | TOR |
| +059+ | 3.09 | Mike Bielecki | 173.7 | CHN |
| +061+ | 3.06 | Bob Welch | 164 | OAK |
| +062+ | 3.04 | Tom Gordon | 125.3 | KCA |
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