| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Scott | HOU | 5.57 | 198908050_HOU_SFN |
| Mike Moore | OAK | 4.6 | 198908050_OAK_SEA |
| Mark Langston | WAS | 4.37 | 198908050_WAS_NYN |
| Bret Saberhagen | KCA | 3.77 | 198908060_KCA_MIN |
| John Cerutti | TOR | 3.55 | 198908070_TEX_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Knepper | SFN | -6.2 | 198908060_HOU_SFN |
| Storm Davis | OAK | -3.35 | 198908060_OAK_SEA |
| Wes Gardner | BOS | -1.9 | 198908070_BOS_KCA |
| Don Carman | PHI | -1.59 | 198908060_PHI_SLN |
| Mike Dunne | SEA | -1.18 | 198908060_OAK_SEA |
Based on accumulated WAA for this season up to 1989-08-07.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +005+ | 5.36 | Chris Bosio | 181.3 | MIL |
| +006+ | 5.33 | Bert Blyleven | 163.3 | ANA |
| +007+ | 5.07 | John Smoltz | 172.3 | ATL |
| +008+ | 5.01 | Orel Hershiser | 175 | LAN |
| +009+ | 4.98 | John Cerutti | 154.3 | TOR |
| +010+ | 4.77 | Chuck Finley | 159.3 | ANA |
| +011+ | 4.71 | Mike Moore | 165.3 | OAK |
| +013+ | 4.65 | Mark Langston | 183.3 | TOT |
| +020+ | 4.22 | Bryn Smith | 150.7 | WAS |
| +022+ | 4.13 | Bret Saberhagen | 166.7 | KCA |
| +023+ | 4.05 | Scott Garrelts | 134.3 | SFN |
| +027+ | 3.8 | Greg Swindell | 153.3 | CLE |
| +029+ | 3.6 | Mike Scott | 166.7 | HOU |
| +028+ | 3.6 | John Smiley | 164.7 | PIT |
| +035+ | 3.49 | Ed Whitson | 162.3 | SDN |
| +037+ | 3.46 | Greg Maddux | 162 | CHN |
| +039+ | 3.42 | Sid Fernandez | 141.7 | NYN |
| +040+ | 3.37 | Kevin Brown | 162.7 | TEX |
| +043+ | 3.33 | Mike Morgan | 133 | LAN |
| +045+ | 3.15 | Mike Bielecki | 141.3 | CHN |
| +051+ | 2.94 | Bruce Hurst | 180.3 | SDN |
| +053+ | 2.92 | Dennis Martinez | 165 | WAS |
| +060+ | 2.68 | Doug Drabek | 163.7 | PIT |
| +061+ | 2.65 | Kirk McCaskill | 137.3 | ANA |
| +062+ | 2.61 | Chuck Cary | 59.3 | NYA |
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