| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 12.69 | 197309210_PIT_NYN |
| Jim Palmer | BAL | 7.62 | 197309200_BAL_DET |
| Nolan Ryan | ANA | 5.1 | 197309191_ANA_TEX |
| Steve Rogers | WAS | 4.14 | 197309210_WAS_CHN |
| Ken Holtzman | OAK | 3.62 | 197309210_OAK_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Blass | PIT | -14.34 | 197309210_PIT_NYN |
| Steve Dunning | TEX | -3.32 | 197309202_ANA_TEX |
| Woodie Fryman | DET | -3.08 | 197309200_BAL_DET |
| Jim Lonborg | PHI | -1.81 | 197309210_SLN_PHI |
| Clay Kirby | SDN | -1.22 | 197309191_SDN_HOU |
Based on accumulated WAA for this season up to 1973-09-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 11.85 | Tom Seaver | 282 | NYN |
| +002+ | 9.59 | Jim Palmer | 289.7 | BAL |
| +006+ | 8.33 | Bert Blyleven | 299 | MIN |
| +007+ | 7.61 | Don Sutton | 246.7 | LAN |
| +008+ | 7.42 | Nolan Ryan | 306 | ANA |
| +010+ | 6.93 | Steve Rogers | 122.7 | WAS |
| +012+ | 6.58 | Wayne Twitchell | 223.3 | PHI |
| +015+ | 6.14 | Bill Lee | 270.3 | BOS |
| +020+ | 5.44 | Steve Renko | 238 | WAS |
| +024+ | 5.34 | Andy Messersmith | 249.7 | LAN |
| +023+ | 5.34 | Ken Holtzman | 290.3 | OAK |
| +030+ | 4.63 | Bob Reynolds | 109 | BAL |
| +031+ | 4.62 | Jack Billingham | 277.3 | CIN |
| +036+ | 4.4 | Dave Roberts | 227.3 | HOU |
| +040+ | 4.19 | Rick Reuschel | 230 | CHN |
| +041+ | 4.13 | Nelson Briles | 212.3 | PIT |
| +043+ | 4.06 | Lindy McDaniel | 154 | NYA |
| +044+ | 4 | Bob Gibson | 189 | SLN |
| +045+ | 3.97 | Jim Colborn | 293.3 | MIL |
| +050+ | 3.83 | Jerry Koosman | 247.3 | NYN |
| +056+ | 3.6 | Mel Stottlemyre | 255 | NYA |
| +058+ | 3.49 | Doc Medich | 218.3 | NYA |
| +057+ | 3.49 | Bill Singer | 294.7 | ANA |
| +060+ | 3.43 | Wilbur Wood | 355 | CHA |
| +061+ | 3.37 | Dave McNally | 254.3 | BAL |
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