| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bert Blyleven | ANA | 5.33 | 198908190_CLE_ANA |
| Mark Langston | WAS | 5.06 | 198908210_LAN_WAS |
| Mike Moore | OAK | 4.52 | 198908200_MIN_OAK |
| Bret Saberhagen | KCA | 3.69 | 198908210_ANA_KCA |
| Mike Scott | HOU | 2.95 | 198908200_CHN_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.15 | 198908190_TEX_CHA |
| Charlie Leibrandt | KCA | -2.2 | 198908200_KCA_SEA |
| Jerry Reuss | MIL | -1.46 | 198908210_MIL_BAL |
| Rich Dotson | CHA | -1.41 | 198908190_TEX_CHA |
| Pete Smith | ATL | -1.33 | 198908200_PIT_ATL |
Based on accumulated WAA for this season up to 1989-08-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 6.23 | Mike Moore | 188 | OAK |
| +006+ | 5.89 | Chris Bosio | 197.7 | MIL |
| +008+ | 5.66 | Orel Hershiser | 199 | LAN |
| +009+ | 5.46 | Bert Blyleven | 186.7 | ANA |
| +010+ | 5.1 | Mark Langston | 208 | TOT |
| +012+ | 4.99 | Chuck Finley | 176.3 | ANA |
| +016+ | 4.79 | Bret Saberhagen | 190.7 | KCA |
| +018+ | 4.6 | Rick Reuschel | 160 | SFN |
| +020+ | 4.58 | Scott Garrelts | 140.3 | SFN |
| +023+ | 4.53 | Ed Whitson | 185.7 | SDN |
| +026+ | 4.34 | Bryn Smith | 171 | WAS |
| +027+ | 4.21 | John Smiley | 178.7 | PIT |
| +029+ | 3.96 | Mike Scott | 181 | HOU |
| +030+ | 3.84 | Greg Swindell | 153.3 | CLE |
| +031+ | 3.8 | John Smoltz | 190.3 | ATL |
| +032+ | 3.79 | Sid Fernandez | 160.3 | NYN |
| +033+ | 3.78 | John Cerutti | 164 | TOR |
| +039+ | 3.59 | Greg Maddux | 183 | CHN |
| +043+ | 3.47 | Mark Gubicza | 216.7 | KCA |
| +048+ | 3.35 | Joe Magrane | 181.3 | SLN |
| +047+ | 3.35 | Bruce Hurst | 196.3 | SDN |
| +049+ | 3.3 | Kirk McCaskill | 159.3 | ANA |
| +054+ | 3.23 | Kevin Brown | 175 | TEX |
| +056+ | 3.17 | Mike Bielecki | 168.3 | CHN |
| +058+ | 3.15 | Mike Morgan | 137.7 | LAN |
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