| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 13.2 | 197308200_CIN_NYN |
| Wayne Twitchell | PHI | 3.84 | 197308190_PHI_HOU |
| Bill Lee | BOS | 3.3 | 197308190_KCA_BOS |
| Rick Reuschel | CHN | 2.39 | 197308190_LAN_CHN |
| Dock Ellis | PIT | 2.22 | 197308200_PIT_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Lonborg | PHI | -3.2 | 197308180_PHI_HOU |
| Johnny Odom | OAK | -2.02 | 197308180_MIL_OAK |
| Mike Torrez | WAS | -1.65 | 197308200_SFN_WAS |
| Tom Timmermann | CLE | -1.19 | 197308191_MIN_CLE |
| Steve Busby | KCA | -1.12 | 197308200_NYA_KCA |
Based on accumulated WAA for this season up to 1973-08-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.04 | Tom Seaver | 224.7 | NYN |
| +005+ | 6.62 | Don Sutton | 211 | LAN |
| +006+ | 6.41 | Ken Holtzman | 242.3 | OAK |
| +008+ | 6.36 | Bert Blyleven | 240.7 | MIN |
| +011+ | 6.02 | Wayne Twitchell | 184.7 | PHI |
| +013+ | 5.66 | Jim Palmer | 220 | BAL |
| +017+ | 5.13 | Bill Lee | 216.7 | BOS |
| +020+ | 4.92 | Rick Reuschel | 200.3 | CHN |
| +022+ | 4.79 | Nolan Ryan | 246.7 | ANA |
| +024+ | 4.49 | Fred Beene | 89 | NYA |
| +027+ | 4.19 | Steve Renko | 180.7 | WAS |
| +029+ | 4.09 | Nelson Briles | 179.3 | PIT |
| +030+ | 4.08 | Ron Bryant | 212.3 | SFN |
| +031+ | 3.93 | Bob Gibson | 189 | SLN |
| +035+ | 3.85 | Terry Forster | 114.7 | CHA |
| +036+ | 3.8 | Jim Colborn | 231.7 | MIL |
| +039+ | 3.56 | Dock Ellis | 175.7 | PIT |
| +041+ | 3.52 | Steve Rogers | 59.7 | WAS |
| +042+ | 3.47 | Dave Roberts | 181 | HOU |
| +048+ | 3.37 | Claude Osteen | 194.7 | LAN |
| +052+ | 3.23 | Jack Billingham | 228.3 | CIN |
| +053+ | 3.21 | Ross Grimsley | 189 | CIN |
| +059+ | 3.07 | Andy Messersmith | 203.7 | LAN |
| +058+ | 3.07 | Rick Wise | 196 | SLN |
| +061+ | 3.05 | Bill Singer | 229 | ANA |
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