| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Moore | OAK | 5.42 | 198908250_OAK_KCA |
| Chris Bosio | MIL | 5.04 | 198908270_MIL_TOR |
| Mark Langston | WAS | 4.04 | 198908260_WAS_SFN |
| Bret Saberhagen | KCA | 3.65 | 198908260_OAK_KCA |
| Scott Garrelts | SFN | 3.23 | 198908260_WAS_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.42 | 198908250_ANA_TEX |
| Wes Gardner | BOS | -3.28 | 198908270_DET_BOS |
| David West | MIN | -3.19 | 198908260_SEA_MIN |
| Rich Dotson | CHA | -2.06 | 198908250_CHA_CLE |
| Bob Forsch | HOU | -2 | 198908270_SLN_HOU |
Based on accumulated WAA for this season up to 1989-08-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 6.41 | Mike Moore | 195.3 | OAK |
| +005+ | 6.2 | Bert Blyleven | 195.7 | ANA |
| +007+ | 6.01 | Orel Hershiser | 206 | LAN |
| +008+ | 5.52 | Chris Bosio | 210.3 | MIL |
| +009+ | 5.49 | Bret Saberhagen | 199.7 | KCA |
| +014+ | 5.05 | Rick Reuschel | 166 | SFN |
| +016+ | 4.95 | Chuck Finley | 176.3 | ANA |
| +018+ | 4.86 | Ed Whitson | 193 | SDN |
| +019+ | 4.66 | John Smiley | 187.7 | PIT |
| +023+ | 4.52 | Scott Garrelts | 147.7 | SFN |
| +027+ | 4.29 | Bryn Smith | 180.3 | WAS |
| +028+ | 4.16 | Mark Gubicza | 225.7 | KCA |
| +030+ | 3.95 | Mark Langston | 211.3 | TOT |
| +032+ | 3.87 | Joe Magrane | 190.3 | SLN |
| +034+ | 3.76 | Doug Drabek | 197 | PIT |
| +035+ | 3.76 | Bob Welch | 172 | OAK |
| +037+ | 3.68 | John Smoltz | 197.7 | ATL |
| +038+ | 3.61 | Sid Fernandez | 166.3 | NYN |
| +039+ | 3.6 | Kirk McCaskill | 165.7 | ANA |
| +050+ | 3.32 | Mike Morgan | 141.7 | LAN |
| +051+ | 3.3 | Bruce Hurst | 199.3 | SDN |
| +058+ | 3.15 | Tom Browning | 215.3 | CIN |
| +057+ | 3.15 | John Cerutti | 168 | TOR |
| +059+ | 3.14 | Greg Maddux | 189 | CHN |
| +061+ | 3.09 | Mike Bielecki | 173.7 | CHN |
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