| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Langston | WAS | 4.85 | 198908110_PIT_WAS |
| Bret Saberhagen | KCA | 4.15 | 198908110_TOR_KCA |
| Chris Bosio | MIL | 3.97 | 198908120_MIL_CLE |
| Chuck Finley | ANA | 3.69 | 198908100_SEA_ANA |
| Mike Moore | OAK | 3.3 | 198908110_OAK_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Knepper | SFN | -5.79 | 198908120_LAN_SFN |
| Storm Davis | OAK | -2.56 | 198908100_OAK_CHA |
| Wes Gardner | BOS | -2.2 | 198908120_BOS_BAL |
| Bob Forsch | HOU | -1.33 | 198908100_HOU_SDN |
| Walt Terrell | NYA | -1.15 | 198908110_NYA_MIN |
Based on accumulated WAA for this season up to 1989-08-12.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 6.22 | Chris Bosio | 190.3 | MIL |
| +006+ | 5.5 | Mike Moore | 174.3 | OAK |
| +007+ | 5.49 | Bert Blyleven | 172.3 | ANA |
| +008+ | 5.43 | Orel Hershiser | 184 | LAN |
| +009+ | 5.25 | Mark Langston | 192.3 | TOT |
| +010+ | 5.03 | John Cerutti | 154.3 | TOR |
| +012+ | 4.93 | Chuck Finley | 168.3 | ANA |
| +018+ | 4.54 | Bret Saberhagen | 175.7 | KCA |
| +022+ | 4.45 | John Smoltz | 176.3 | ATL |
| +023+ | 4.26 | Bryn Smith | 157.7 | WAS |
| +026+ | 4.06 | John Smiley | 171.7 | PIT |
| +027+ | 4.02 | Ed Whitson | 170.3 | SDN |
| +029+ | 3.83 | Greg Swindell | 153.3 | CLE |
| +030+ | 3.7 | Kevin Brown | 170.7 | TEX |
| +031+ | 3.69 | Greg Maddux | 169 | CHN |
| +032+ | 3.67 | Mike Scott | 166.7 | HOU |
| +038+ | 3.55 | Mike Morgan | 135 | LAN |
| +045+ | 3.26 | Sid Fernandez | 146.7 | NYN |
| +052+ | 3.08 | Mike Bielecki | 154.7 | CHN |
| +053+ | 3.06 | Kirk McCaskill | 144.3 | ANA |
| +056+ | 2.97 | Dennis Martinez | 172 | WAS |
| +057+ | 2.91 | Todd Burns | 77 | OAK |
| +059+ | 2.89 | Tom Candiotti | 142.7 | CLE |
| +062+ | 2.8 | Doug Drabek | 171.7 | PIT |
| +065+ | 2.78 | Mark Gubicza | 208.7 | KCA |
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