| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.35 | 198907180_CHN_LAN |
| Mark Gubicza | KCA | 5.57 | 198907180_MIL_KCA |
| Roger Clemens | BOS | 5.24 | 198907180_BOS_TEX |
| Dennis Martinez | WAS | 3.2 | 198907180_ATL_WAS |
| Mike Moore | OAK | 2.68 | 198907160_OAK_TOR |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Knepper | HOU | -6.19 | 198907172_HOU_NYN |
| Bobby Witt | TEX | -4.49 | 198907180_BOS_TEX |
| Storm Davis | OAK | -3.04 | 198907180_OAK_DET |
| Kevin Gross | WAS | -2.29 | 198907160_WAS_CIN |
| Rich Dotson | CHA | -1.88 | 198907160_MIL_CHA |
Based on accumulated WAA for this season up to 1989-07-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.32 | John Smoltz | 142 | ATL |
| +003+ | 5.13 | Mike Moore | 136 | OAK |
| +007+ | 4.92 | Bryn Smith | 127.7 | WAS |
| +008+ | 4.9 | Bert Blyleven | 140.7 | ANA |
| +009+ | 4.66 | Orel Hershiser | 152.3 | LAN |
| +011+ | 4.47 | Rick Reuschel | 145 | SFN |
| +012+ | 4.06 | Mark Gubicza | 175.3 | KCA |
| +013+ | 4.06 | Doug Drabek | 134 | PIT |
| +014+ | 4 | Chuck Finley | 130.3 | ANA |
| +017+ | 3.87 | Mike Morgan | 118 | LAN |
| +019+ | 3.77 | Bret Saberhagen | 135.7 | KCA |
| +021+ | 3.67 | Greg Swindell | 142.7 | CLE |
| +025+ | 3.43 | Ed Whitson | 137.3 | SDN |
| +026+ | 3.35 | Mike Scott | 140.3 | HOU |
| +031+ | 3.09 | John Cerutti | 123.3 | TOR |
| +036+ | 2.89 | Scott Garrelts | 114.3 | SFN |
| +041+ | 2.8 | Scott Bankhead | 125.7 | SEA |
| +045+ | 2.76 | Sid Fernandez | 117 | NYN |
| +042+ | 2.76 | Mark Langston | 150.3 | TOT |
| +043+ | 2.76 | Chris Bosio | 143 | MIL |
| +053+ | 2.51 | Todd Burns | 67.3 | OAK |
| +059+ | 2.3 | Jose Rijo | 111.3 | CIN |
| +062+ | 2.27 | Greg Maddux | 132.3 | CHN |
| +068+ | 2.22 | Rick Mahler | 154 | CIN |
| +069+ | 2.16 | Bruce Hurst | 149.3 | SDN |
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