| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bret Saberhagen | KCA | 7.69 | 198909170_KCA_BAL |
| Scott Garrelts | SFN | 5.25 | 198909171_SDN_SFN |
| John Smiley | PIT | 4.12 | 198909160_CHN_PIT |
| Bert Blyleven | ANA | 3.54 | 198909180_ANA_MIN |
| Chris Bosio | MIL | 3.04 | 198909170_TEX_MIL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -6.88 | 198909170_TEX_MIL |
| Walt Terrell | NYA | -3.59 | 198909170_SEA_NYA |
| Don Carman | PHI | -2.79 | 198909171_SLN_PHI |
| Mike Witt | ANA | -2.18 | 198909170_ANA_CHA |
| David West | MIN | -1.9 | 198909180_ANA_MIN |
Based on accumulated WAA for this season up to 1989-09-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 7.91 | Bret Saberhagen | 239 | KCA |
| +005+ | 7.02 | Orel Hershiser | 234 | LAN |
| +011+ | 5.91 | Scott Garrelts | 178.7 | SFN |
| +015+ | 5.5 | Mike Moore | 220.7 | OAK |
| +017+ | 5.45 | Bert Blyleven | 225 | ANA |
| +019+ | 5.23 | Chuck Finley | 181.3 | ANA |
| +020+ | 5.11 | Mark Langston | 240.7 | TOT |
| +021+ | 5.07 | Ed Whitson | 212 | SDN |
| +022+ | 5.06 | Bruce Hurst | 231.3 | SDN |
| +023+ | 4.85 | Mark Gubicza | 254.7 | KCA |
| +024+ | 4.74 | Chris Bosio | 235 | MIL |
| +025+ | 4.74 | John Smiley | 201 | PIT |
| +032+ | 4.52 | Bryn Smith | 203.7 | WAS |
| +034+ | 4.41 | Rick Reuschel | 195.3 | SFN |
| +038+ | 4.09 | Jose DeLeon | 233 | SLN |
| +040+ | 4.09 | Doug Drabek | 230.7 | PIT |
| +046+ | 3.79 | Kirk McCaskill | 191.3 | ANA |
| +048+ | 3.77 | John Smoltz | 209.7 | ATL |
| +053+ | 3.63 | John Cerutti | 198.7 | TOR |
| +054+ | 3.62 | Mike Morgan | 149.3 | LAN |
| +059+ | 3.34 | Todd Burns | 91.7 | OAK |
| +063+ | 3.25 | Greg Maddux | 221 | CHN |
| +064+ | 3.24 | Joe Magrane | 220.7 | SLN |
| +069+ | 3.08 | Tim Belcher | 212.3 | LAN |
| +071+ | 3.04 | Mike Scott | 217 | HOU |
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