| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mark Langston | WAS | 5.61 | 198908160_SFN_WAS |
| Chris Bosio | MIL | 5.26 | 198908170_BOS_MIL |
| Mike Moore | OAK | 4.77 | 198908160_CLE_OAK |
| Bret Saberhagen | KCA | 4.42 | 198908160_KCA_CHA |
| Chuck Finley | ANA | 3.92 | 198908150_MIN_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wes Gardner | BOS | -2.97 | 198908170_BOS_MIL |
| Don Carman | PHI | -1.82 | 198908160_LAN_PHI |
| Storm Davis | OAK | -1.7 | 198908150_CLE_OAK |
| Shane Rawley | MIN | -1.68 | 198908160_MIN_ANA |
| Mike Witt | ANA | -1.31 | 198908160_MIN_ANA |
Based on accumulated WAA for this season up to 1989-08-17.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 5.94 | Chris Bosio | 197.7 | MIL |
| +005+ | 5.63 | Bert Blyleven | 179.3 | ANA |
| +006+ | 5.55 | Orel Hershiser | 191 | LAN |
| +007+ | 5.53 | Mike Moore | 180 | OAK |
| +009+ | 5.39 | Mark Langston | 199.3 | TOT |
| +011+ | 5.11 | Chuck Finley | 175.7 | ANA |
| +018+ | 4.5 | Bret Saberhagen | 182.7 | KCA |
| +022+ | 4.17 | Bryn Smith | 164.3 | WAS |
| +023+ | 4.16 | John Smiley | 178.7 | PIT |
| +024+ | 4.11 | Ed Whitson | 179 | SDN |
| +030+ | 3.88 | Greg Maddux | 177 | CHN |
| +032+ | 3.79 | Greg Swindell | 153.3 | CLE |
| +033+ | 3.75 | John Cerutti | 164 | TOR |
| +034+ | 3.74 | Mike Scott | 173.7 | HOU |
| +036+ | 3.73 | John Smoltz | 182.3 | ATL |
| +041+ | 3.49 | Mike Bielecki | 162.7 | CHN |
| +042+ | 3.45 | Mark Gubicza | 216.7 | KCA |
| +044+ | 3.41 | Sid Fernandez | 153.7 | NYN |
| +049+ | 3.3 | Bruce Hurst | 196.3 | SDN |
| +050+ | 3.28 | Doug Drabek | 180.7 | PIT |
| +053+ | 3.22 | Kevin Brown | 175 | TEX |
| +054+ | 3.15 | Mike Morgan | 135.7 | LAN |
| +062+ | 2.81 | Tom Candiotti | 151.7 | CLE |
| +063+ | 2.77 | Jim Deshaies | 174.7 | HOU |
| +064+ | 2.76 | Joe Magrane | 172.7 | SLN |
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