| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Palmer | BAL | 6.36 | 197309121_MIL_BAL |
| Don Sutton | LAN | 5.54 | 197309110_LAN_CIN |
| Nolan Ryan | ANA | 4.14 | 197309110_CHA_ANA |
| Wayne Twitchell | PHI | 3.89 | 197309120_NYN_PHI |
| Steve Rogers | WAS | 3.84 | 197309120_WAS_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Blass | PIT | -16.49 | 197309110_PIT_CHN |
| Woodie Fryman | DET | -3.66 | 197309110_DET_MIL |
| Jim Lonborg | PHI | -2.6 | 197309110_NYN_PHI |
| Steve Busby | KCA | -1.26 | 197309100_KCA_OAK |
| Dick Tidrow | CLE | -1.19 | 197309100_CLE_NYA |
Based on accumulated WAA for this season up to 1973-09-12.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 11.84 | Tom Seaver | 259 | NYN |
| +005+ | 8.01 | Jim Palmer | 271.3 | BAL |
| +006+ | 7.64 | Bert Blyleven | 282 | MIN |
| +008+ | 7.25 | Don Sutton | 237.7 | LAN |
| +010+ | 6.64 | Steve Rogers | 109.7 | WAS |
| +011+ | 6.34 | Nolan Ryan | 288 | ANA |
| +012+ | 6.33 | Wayne Twitchell | 218 | PHI |
| +018+ | 5.7 | Ken Holtzman | 277 | OAK |
| +021+ | 5.18 | Bill Lee | 252 | BOS |
| +027+ | 4.98 | Steve Renko | 223 | WAS |
| +030+ | 4.6 | Jack Billingham | 264.3 | CIN |
| +032+ | 4.55 | Dave Roberts | 212.3 | HOU |
| +033+ | 4.47 | Bob Reynolds | 102.3 | BAL |
| +035+ | 4.33 | Dave McNally | 241 | BAL |
| +037+ | 4.31 | Terry Forster | 150.3 | CHA |
| +036+ | 4.31 | Andy Messersmith | 232.7 | LAN |
| +040+ | 4.22 | Nelson Briles | 201.3 | PIT |
| +041+ | 4.11 | Lindy McDaniel | 145 | NYA |
| +042+ | 4 | Bob Gibson | 189 | SLN |
| +043+ | 3.99 | Rick Reuschel | 216 | CHN |
| +048+ | 3.79 | Jim Colborn | 277.3 | MIL |
| +049+ | 3.73 | Stan Bahnsen | 264 | CHA |
| +052+ | 3.62 | Jerry Koosman | 234.3 | NYN |
| +063+ | 3.37 | Bill Singer | 275.7 | ANA |
| +064+ | 3.35 | Wilbur Wood | 341.3 | CHA |
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