| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 15.1 | 197309130_NYN_PHI |
| 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 |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Blass | PIT | -16.49 | 197309110_PIT_CHN |
| Woodie Fryman | DET | -3.66 | 197309110_DET_MIL |
| Steve Arlin | SDN | -2.72 | 197309130_SFN_SDN |
| Jim Lonborg | PHI | -2.6 | 197309110_NYN_PHI |
| Pat Dobson | NYA | -1.05 | 197309110_CLE_NYA |
Based on accumulated WAA for this season up to 1973-09-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 12.32 | Tom Seaver | 270 | NYN |
| +005+ | 7.99 | Jim Palmer | 271.3 | BAL |
| +006+ | 7.64 | Bert Blyleven | 282 | MIN |
| +008+ | 7.26 | Don Sutton | 237.7 | LAN |
| +010+ | 6.64 | Steve Rogers | 109.7 | WAS |
| +011+ | 6.34 | Nolan Ryan | 288 | ANA |
| +012+ | 6.28 | Wayne Twitchell | 218 | PHI |
| +017+ | 5.75 | Bill Lee | 261.3 | BOS |
| +020+ | 5.7 | Ken Holtzman | 277 | OAK |
| +026+ | 4.98 | Steve Renko | 223 | WAS |
| +029+ | 4.78 | Bob Reynolds | 106 | BAL |
| +030+ | 4.6 | Jack Billingham | 264.3 | CIN |
| +034+ | 4.32 | Andy Messersmith | 232.7 | LAN |
| +036+ | 4.31 | Terry Forster | 150.3 | CHA |
| +035+ | 4.31 | Dave McNally | 241 | BAL |
| +039+ | 4.22 | Nelson Briles | 201.3 | PIT |
| +040+ | 4.07 | Lindy McDaniel | 145 | NYA |
| +041+ | 4.02 | Dave Roberts | 218.3 | HOU |
| +042+ | 4 | Bob Gibson | 189 | SLN |
| +043+ | 3.99 | Rick Reuschel | 216 | CHN |
| +046+ | 3.77 | Jim Colborn | 277.3 | MIL |
| +048+ | 3.73 | Stan Bahnsen | 264 | CHA |
| +054+ | 3.58 | Jerry Koosman | 234.3 | NYN |
| +053+ | 3.58 | Doc Medich | 210.3 | NYA |
| +065+ | 3.37 | Bill Singer | 275.7 | ANA |
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