| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 13.03 | 197308250_SFN_NYN |
| Wayne Twitchell | PHI | 4 | 197308240_LAN_PHI |
| Bill Lee | BOS | 3.29 | 197308240_BOS_ANA |
| Rick Reuschel | CHN | 2.64 | 197308250_CHN_HOU |
| Jim Colborn | MIL | 2.61 | 197308250_MIL_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Lonborg | PHI | -3.18 | 197308230_SDN_PHI |
| Mike Torrez | WAS | -1.51 | 197308250_SDN_WAS |
| Dick Tidrow | CLE | -1.4 | 197308250_TEX_CLE |
| Dave Goltz | MIN | -1.28 | 197308250_MIL_MIN |
| Steve Busby | KCA | -0.89 | 197308250_KCA_BAL |
Based on accumulated WAA for this season up to 1973-08-25.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.5 | Tom Seaver | 232.7 | NYN |
| +004+ | 6.91 | Don Sutton | 219.7 | LAN |
| +006+ | 6.69 | Bert Blyleven | 249 | MIN |
| +009+ | 6.25 | Wayne Twitchell | 192.7 | PHI |
| +010+ | 6.12 | Ken Holtzman | 246.3 | OAK |
| +013+ | 6.05 | Jim Palmer | 227 | BAL |
| +014+ | 5.7 | Bill Lee | 225.7 | BOS |
| +019+ | 5.09 | Rick Reuschel | 207.3 | CHN |
| +024+ | 4.64 | Ron Bryant | 221.3 | SFN |
| +025+ | 4.61 | Terry Forster | 123.7 | CHA |
| +026+ | 4.59 | Nelson Briles | 185.3 | PIT |
| +029+ | 4.5 | Fred Beene | 89 | NYA |
| +031+ | 4.4 | Steve Renko | 188 | WAS |
| +032+ | 4.12 | Nolan Ryan | 261 | ANA |
| +033+ | 4.07 | Jim Colborn | 246.7 | MIL |
| +035+ | 3.93 | Bob Gibson | 189 | SLN |
| +039+ | 3.65 | Steve Rogers | 66 | WAS |
| +038+ | 3.65 | Tommy John | 170.3 | LAN |
| +041+ | 3.64 | Andy Messersmith | 210.7 | LAN |
| +042+ | 3.63 | Dave McNally | 211 | BAL |
| +046+ | 3.54 | Dock Ellis | 175.7 | PIT |
| +050+ | 3.43 | Dave Roberts | 188 | HOU |
| +051+ | 3.38 | Ross Grimsley | 196 | CIN |
| +052+ | 3.37 | Stan Bahnsen | 235.7 | CHA |
| +053+ | 3.33 | Bill Singer | 237.3 | ANA |
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