| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Reuschel | SFN | 8.83 | 198907140_PIT_SFN |
| Mark Gubicza | KCA | 6.9 | 198907130_KCA_NYA |
| Orel Hershiser | LAN | 6.89 | 198907130_SLN_LAN |
| Doug Drabek | PIT | 6.04 | 198907140_PIT_SFN |
| Mike Scott | HOU | 5.53 | 198907090_WAS_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -4.76 | 198907130_TEX_CLE |
| Jerry Reuss | CHA | -3.31 | 198907130_MIL_CHA |
| Bob Knepper | HOU | -3.01 | 198907131_HOU_PHI |
| Storm Davis | OAK | -2.36 | 198907130_OAK_TOR |
| Bruce Ruffin | PHI | -1.39 | 198907131_HOU_PHI |
Based on accumulated WAA for this season up to 1989-07-14.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.27 | John Smoltz | 142 | ATL |
| +003+ | 4.92 | Bryn Smith | 127.7 | WAS |
| +007+ | 4.55 | Mike Moore | 130 | OAK |
| +009+ | 4.43 | Rick Reuschel | 145 | SFN |
| +010+ | 4.27 | Chuck Finley | 124.3 | ANA |
| +011+ | 4.06 | Bert Blyleven | 131.7 | ANA |
| +012+ | 3.97 | Doug Drabek | 134 | PIT |
| +013+ | 3.9 | Mark Gubicza | 167.3 | KCA |
| +014+ | 3.86 | Orel Hershiser | 143.3 | LAN |
| +015+ | 3.83 | Mike Morgan | 118 | LAN |
| +016+ | 3.7 | Bret Saberhagen | 135.7 | KCA |
| +022+ | 3.4 | Ed Whitson | 137.3 | SDN |
| +024+ | 3.29 | Mike Scott | 140.3 | HOU |
| +028+ | 3.05 | Greg Swindell | 133.7 | CLE |
| +029+ | 3.05 | Mark Langston | 144.3 | TOT |
| +037+ | 2.75 | Scott Bankhead | 118.7 | SEA |
| +038+ | 2.75 | John Cerutti | 117.3 | TOR |
| +041+ | 2.67 | Chris Bosio | 143 | MIL |
| +045+ | 2.6 | Dennis Martinez | 137.3 | WAS |
| +048+ | 2.52 | Greg Maddux | 126.3 | CHN |
| +051+ | 2.49 | Nolan Ryan | 127 | TEX |
| +053+ | 2.47 | Kevin Brown | 124.3 | TEX |
| +056+ | 2.44 | Roger Clemens | 146.3 | BOS |
| +063+ | 2.35 | Scott Garrelts | 108.3 | SFN |
| +064+ | 2.27 | John Smiley | 126.3 | PIT |
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