| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 7.84 | 198906250_LAN_CIN |
| Mike Scott | HOU | 6.67 | 198906240_HOU_ATL |
| Mark Gubicza | KCA | 6.08 | 198906230_NYA_KCA |
| Dennis Martinez | WAS | 3.4 | 198906250_WAS_CHN |
| Don Robinson | SFN | 3.07 | 198906240_SFN_SDN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Melido Perez | CHA | -4.97 | 198906232_CHA_MIL |
| Bill Swift | SEA | -3.2 | 198906250_DET_SEA |
| Storm Davis | OAK | -2.17 | 198906250_TOR_OAK |
| Andy Hawkins | NYA | -1.8 | 198906250_NYA_KCA |
| Fred Toliver | MIN | -1.68 | 198906242_MIN_BOS |
Based on accumulated WAA for this season up to 1989-06-25.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 4.47 | Rick Reuschel | 119 | SFN |
| +005+ | 4.23 | Mike Morgan | 93.3 | LAN |
| +006+ | 4.14 | Mark Gubicza | 139.3 | KCA |
| +007+ | 4.01 | Mike Moore | 109.3 | OAK |
| +008+ | 3.82 | John Smoltz | 110.7 | ATL |
| +009+ | 3.81 | Orel Hershiser | 121 | LAN |
| +013+ | 3.36 | Greg Swindell | 119.3 | CLE |
| +015+ | 3.35 | Bryn Smith | 99.3 | WAS |
| +017+ | 3.29 | Chuck Finley | 106.3 | ANA |
| +018+ | 3.21 | Bert Blyleven | 103 | ANA |
| +021+ | 3.07 | Doug Drabek | 103.7 | PIT |
| +022+ | 3.05 | Mike Scott | 121.3 | HOU |
| +025+ | 2.83 | Bret Saberhagen | 109.3 | KCA |
| +028+ | 2.76 | Dwight Gooden | 106 | NYN |
| +031+ | 2.69 | Todd Burns | 55.3 | OAK |
| +033+ | 2.68 | Ed Whitson | 109.3 | SDN |
| +036+ | 2.62 | Don Robinson | 104.7 | SFN |
| +038+ | 2.56 | Dennis Martinez | 117 | WAS |
| +046+ | 2.39 | John Cerutti | 96.3 | TOR |
| +048+ | 2.34 | Scott Garrelts | 106.3 | SFN |
| +049+ | 2.33 | Chris Bosio | 113.3 | MIL |
| +054+ | 2.2 | Mike Bielecki | 86.7 | CHN |
| +055+ | 2.16 | Jose Rijo | 98 | CIN |
| +059+ | 2.06 | Nolan Ryan | 112.7 | TEX |
| +060+ | 2 | Bob Welch | 93.3 | OAK |
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