| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 15.1 | 197309130_NYN_PHI |
| Bert Blyleven | MIN | 6.46 | 197309140_MIN_CHA |
| Nolan Ryan | ANA | 4.54 | 197309150_KCA_ANA |
| Bill Lee | BOS | 2.57 | 197309130_BOS_NYA |
| Nelson Briles | PIT | 2.05 | 197309140_PIT_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Arlin | SDN | -2.72 | 197309130_SFN_SDN |
| Pete Broberg | TEX | -2.23 | 197309150_TEX_OAK |
| Steve Busby | KCA | -1.83 | 197309140_KCA_ANA |
| Tom Timmermann | CLE | -1.77 | 197309140_CLE_BOS |
| Marty Pattin | BOS | -1.48 | 197309150_CLE_BOS |
Based on accumulated WAA for this season up to 1973-09-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 12.3 | Tom Seaver | 270 | NYN |
| +004+ | 8.42 | Bert Blyleven | 291 | MIN |
| +006+ | 7.97 | Jim Palmer | 271.3 | BAL |
| +008+ | 7.26 | Don Sutton | 237.7 | LAN |
| +010+ | 6.89 | Nolan Ryan | 297 | ANA |
| +011+ | 6.62 | Steve Rogers | 109.7 | WAS |
| +013+ | 6.27 | Wayne Twitchell | 218 | PHI |
| +017+ | 5.72 | Bill Lee | 261.3 | BOS |
| +019+ | 5.65 | Ken Holtzman | 277 | OAK |
| +027+ | 4.95 | Steve Renko | 223 | WAS |
| +029+ | 4.87 | Andy Messersmith | 241.7 | LAN |
| +031+ | 4.77 | Rick Reuschel | 225 | CHN |
| +030+ | 4.77 | Bob Reynolds | 106 | BAL |
| +032+ | 4.56 | Jack Billingham | 264.3 | CIN |
| +034+ | 4.52 | Nelson Briles | 207.3 | PIT |
| +037+ | 4.44 | Dave McNally | 250 | BAL |
| +039+ | 4.29 | Terry Forster | 150.3 | CHA |
| +040+ | 4.27 | Jim Colborn | 285.3 | MIL |
| +043+ | 4.06 | Lindy McDaniel | 145 | NYA |
| +045+ | 4 | Dave Roberts | 218.3 | HOU |
| +047+ | 3.98 | Bob Gibson | 189 | SLN |
| +060+ | 3.56 | Doc Medich | 210.3 | NYA |
| +059+ | 3.56 | Jerry Koosman | 234.3 | NYN |
| +062+ | 3.48 | Stan Bahnsen | 271 | CHA |
| +063+ | 3.46 | Mel Stottlemyre | 247 | NYA |
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