| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Langston | WAS | 5.06 | 198908210_LAN_WAS |
| Mike Moore | OAK | 4.52 | 198908200_MIN_OAK |
| Chris Bosio | MIL | 4.33 | 198908220_MIL_BAL |
| Chuck Finley | ANA | 4.07 | 198908210_ANA_KCA |
| Bret Saberhagen | KCA | 3.69 | 198908210_ANA_KCA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Knepper | SFN | -4.69 | 198908220_SFN_NYN |
| Wes Gardner | BOS | -3.35 | 198908220_BOS_NYA |
| Charlie Leibrandt | KCA | -2.2 | 198908200_KCA_SEA |
| Shane Rawley | MIN | -2 | 198908220_CHA_MIN |
| Jerry Reuss | MIL | -1.46 | 198908210_MIL_BAL |
Based on accumulated WAA for this season up to 1989-08-22.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 6.19 | Mike Moore | 188 | OAK |
| +005+ | 6.15 | Chris Bosio | 205.7 | MIL |
| +008+ | 5.64 | Orel Hershiser | 199 | LAN |
| +009+ | 5.44 | Bert Blyleven | 186.7 | ANA |
| +010+ | 5.06 | Mark Langston | 208 | TOT |
| +012+ | 4.96 | Chuck Finley | 176.3 | ANA |
| +015+ | 4.75 | Bret Saberhagen | 190.7 | KCA |
| +016+ | 4.73 | John Smiley | 187.7 | PIT |
| +019+ | 4.57 | Rick Reuschel | 160 | SFN |
| +020+ | 4.56 | Scott Garrelts | 140.3 | SFN |
| +023+ | 4.5 | Ed Whitson | 185.7 | SDN |
| +027+ | 4.31 | Bryn Smith | 171 | WAS |
| +029+ | 3.94 | Mike Scott | 181 | HOU |
| +031+ | 3.8 | Greg Swindell | 153.3 | CLE |
| +032+ | 3.77 | John Smoltz | 190.3 | ATL |
| +034+ | 3.76 | Sid Fernandez | 160.3 | NYN |
| +035+ | 3.68 | John Cerutti | 164 | TOR |
| +037+ | 3.6 | Mark Gubicza | 218.7 | KCA |
| +040+ | 3.56 | Greg Maddux | 183 | CHN |
| +046+ | 3.38 | Bruce Hurst | 199.3 | SDN |
| +049+ | 3.31 | Joe Magrane | 181.3 | SLN |
| +050+ | 3.31 | Mike Morgan | 139.7 | LAN |
| +051+ | 3.28 | Kirk McCaskill | 159.3 | ANA |
| +054+ | 3.19 | Kevin Brown | 175 | TEX |
| +058+ | 3.13 | Mike Bielecki | 168.3 | CHN |
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