| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rick Reuschel | SFN | 6.61 | 198907240_SFN_ATL |
| Bryn Smith | WAS | 5.25 | 198907240_PHI_WAS |
| Mike Scott | HOU | 4.92 | 198907260_LAN_HOU |
| Mike Moore | OAK | 4.17 | 198907260_ANA_OAK |
| John Smoltz | ATL | 3.97 | 198907240_SFN_ATL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Swift | SEA | -2.99 | 198907260_SEA_CHA |
| Jerry Reuss | CHA | -2.49 | 198907240_SEA_CHA |
| Dave Schmidt | BAL | -1.99 | 198907250_BAL_MIN |
| Don Carman | PHI | -1.79 | 198907250_PHI_WAS |
| Kevin Gross | WAS | -1.58 | 198907260_PHI_WAS |
Based on accumulated WAA for this season up to 1989-07-26.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.83 | John Smoltz | 158 | ATL |
| +003+ | 5.37 | Bryn Smith | 141.7 | WAS |
| +004+ | 5.15 | Mike Moore | 151.3 | OAK |
| +007+ | 4.88 | Rick Reuschel | 150 | SFN |
| +009+ | 4.74 | Bert Blyleven | 147.7 | ANA |
| +010+ | 4.7 | Orel Hershiser | 160 | LAN |
| +011+ | 4.68 | Chuck Finley | 147 | ANA |
| +016+ | 4.18 | Mike Scott | 155.3 | HOU |
| +017+ | 4.13 | Ed Whitson | 153.3 | SDN |
| +019+ | 4 | Mark Langston | 168.3 | TOT |
| +020+ | 3.92 | Scott Garrelts | 129 | SFN |
| +021+ | 3.9 | Chris Bosio | 159 | MIL |
| +022+ | 3.71 | Greg Swindell | 153.3 | CLE |
| +027+ | 3.4 | John Cerutti | 129.3 | TOR |
| +031+ | 3.35 | Bret Saberhagen | 150.7 | KCA |
| +037+ | 3.19 | Mike Bielecki | 126.7 | CHN |
| +038+ | 3.16 | Mark Gubicza | 180 | KCA |
| +039+ | 3.11 | Doug Drabek | 148 | PIT |
| +041+ | 2.99 | Mike Morgan | 127.3 | LAN |
| +042+ | 2.92 | Sid Fernandez | 121.7 | NYN |
| +044+ | 2.9 | Kevin Brown | 146.3 | TEX |
| +045+ | 2.89 | John Smiley | 150.3 | PIT |
| +059+ | 2.51 | Jim Deshaies | 140.3 | HOU |
| +060+ | 2.5 | Todd Burns | 70 | OAK |
| +065+ | 2.3 | Jose Rijo | 111.3 | CIN |
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