| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 5.66 | 198908230_LAN_WAS |
| Bert Blyleven | ANA | 4.77 | 198908240_ANA_KCA |
| Chris Bosio | MIL | 4.33 | 198908220_MIL_BAL |
| Rick Reuschel | SFN | 3.71 | 198908230_SFN_NYN |
| John Smiley | PIT | 2.95 | 198908220_HOU_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Knepper | SFN | -4.69 | 198908220_SFN_NYN |
| Melido Perez | CHA | -4.32 | 198908240_CHA_MIN |
| Dave Schmidt | BAL | -3.94 | 198908242_BAL_NYA |
| Wes Gardner | BOS | -3.35 | 198908220_BOS_NYA |
| Jim Clancy | HOU | -2.4 | 198908230_HOU_PIT |
Based on accumulated WAA for this season up to 1989-08-24.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 6.21 | Bert Blyleven | 195.7 | ANA |
| +005+ | 6.19 | Mike Moore | 188 | OAK |
| +006+ | 6.14 | Chris Bosio | 205.7 | MIL |
| +008+ | 6.02 | Orel Hershiser | 206 | LAN |
| +011+ | 5.08 | Rick Reuschel | 166 | SFN |
| +013+ | 4.96 | Chuck Finley | 176.3 | ANA |
| +016+ | 4.93 | Mark Langston | 208 | TOT |
| +018+ | 4.73 | Bret Saberhagen | 190.7 | KCA |
| +019+ | 4.64 | John Smiley | 187.7 | PIT |
| +022+ | 4.54 | Scott Garrelts | 140.3 | SFN |
| +026+ | 4.49 | Ed Whitson | 185.7 | SDN |
| +028+ | 4.3 | Bryn Smith | 173 | WAS |
| +030+ | 3.88 | Mike Scott | 181 | HOU |
| +031+ | 3.88 | Joe Magrane | 190.3 | SLN |
| +037+ | 3.75 | Sid Fernandez | 160.3 | NYN |
| +035+ | 3.75 | John Smoltz | 190.3 | ATL |
| +036+ | 3.75 | Doug Drabek | 197 | PIT |
| +040+ | 3.58 | Mark Gubicza | 218.7 | KCA |
| +048+ | 3.36 | Bruce Hurst | 199.3 | SDN |
| +052+ | 3.28 | Kirk McCaskill | 159.3 | ANA |
| +053+ | 3.22 | Greg Maddux | 189 | CHN |
| +055+ | 3.17 | John Cerutti | 168 | TOR |
| +056+ | 3.16 | Mike Morgan | 139.7 | LAN |
| +057+ | 3.12 | Mike Bielecki | 168.3 | CHN |
| +060+ | 3.07 | Tom Gordon | 125.3 | KCA |
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