| Starter | Tm | Tier | Game |
|---|---|---|---|
| Orel Hershiser | LAN | 8.7 | 198906190_LAN_SDN |
| Mike Scott | HOU | 6.16 | 198906180_HOU_SDN |
| Dwight Gooden | NYN | 5.59 | 198906190_WAS_NYN |
| Dennis Martinez | WAS | 4.59 | 198906200_WAS_NYN |
| Don Robinson | SFN | 3.03 | 198906190_HOU_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Swift | SEA | -4.09 | 198906190_BAL_SEA |
| Jerry Reuss | CHA | -2.47 | 198906200_CHA_NYA |
| Storm Davis | OAK | -1.83 | 198906200_DET_OAK |
| Bob Knepper | HOU | -1.7 | 198906190_HOU_SFN |
| Mike Boddicker | BOS | -1.64 | 198906200_TEX_BOS |
Based on accumulated WAA for this season up to 1989-06-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 4.09 | Mike Morgan | 87.3 | LAN |
| +004+ | 3.79 | Rick Reuschel | 111.7 | SFN |
| +006+ | 3.53 | Mike Moore | 101 | OAK |
| +012+ | 3.32 | Greg Swindell | 112.3 | CLE |
| +011+ | 3.32 | Scott Garrelts | 103.7 | SFN |
| +010+ | 3.32 | Mark Gubicza | 130.3 | KCA |
| +009+ | 3.32 | John Smoltz | 105.3 | ATL |
| +014+ | 3.26 | Ed Whitson | 104.3 | SDN |
| +015+ | 3.24 | Mike Scott | 114.3 | HOU |
| +019+ | 2.99 | Orel Hershiser | 112 | LAN |
| +020+ | 2.97 | Chuck Finley | 97.3 | ANA |
| +021+ | 2.9 | Bryn Smith | 92.3 | WAS |
| +025+ | 2.72 | Dwight Gooden | 106 | NYN |
| +030+ | 2.68 | Bert Blyleven | 94 | ANA |
| +034+ | 2.57 | Todd Burns | 53.7 | OAK |
| +041+ | 2.4 | Mike Bielecki | 79.3 | CHN |
| +046+ | 2.29 | Doug Drabek | 94.7 | PIT |
| +045+ | 2.29 | Roger Clemens | 111.3 | BOS |
| +048+ | 2.26 | John Cerutti | 89.3 | TOR |
| +053+ | 2.16 | Chris Bosio | 104.3 | MIL |
| +058+ | 2.04 | Don Robinson | 96 | SFN |
| +060+ | 2.03 | Bob Welch | 93.3 | OAK |
| +059+ | 2.03 | Bret Saberhagen | 100.3 | KCA |
| +062+ | 1.99 | Dennis Martinez | 111 | WAS |
| +066+ | 1.88 | Jose Rijo | 93 | CIN |
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