| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Lonborg | PHI | -3.18 | 197308230_SDN_PHI |
| Steve Arlin | SDN | -2.03 | 197308220_SDN_PHI |
| Johnny Odom | OAK | -1.91 | 197308220_DET_OAK |
| Tom Timmermann | CLE | -1.15 | 197308240_TEX_CLE |
| Tom Griffin | HOU | -0.67 | 197308220_PIT_HOU |
Based on accumulated WAA for this season up to 1973-08-24.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.02 | Tom Seaver | 224.7 | NYN |
| +004+ | 6.94 | Don Sutton | 219.7 | LAN |
| +006+ | 6.69 | Bert Blyleven | 249 | MIN |
| +009+ | 6.29 | Wayne Twitchell | 192.7 | PHI |
| +011+ | 6.12 | Ken Holtzman | 246.3 | OAK |
| +012+ | 6.05 | Jim Palmer | 227 | BAL |
| +014+ | 5.7 | Bill Lee | 225.7 | BOS |
| +022+ | 4.91 | Rick Reuschel | 200.3 | CHN |
| +024+ | 4.63 | Ron Bryant | 221.3 | SFN |
| +025+ | 4.62 | Nelson Briles | 185.3 | PIT |
| +027+ | 4.6 | Jim Colborn | 240.7 | MIL |
| +026+ | 4.6 | Terry Forster | 123.7 | CHA |
| +029+ | 4.49 | Fred Beene | 89 | NYA |
| +030+ | 4.4 | Steve Renko | 188 | WAS |
| +033+ | 4 | Nolan Ryan | 252.3 | ANA |
| +034+ | 3.91 | Bob Gibson | 189 | SLN |
| +038+ | 3.68 | Tommy John | 170.3 | LAN |
| +039+ | 3.67 | Andy Messersmith | 210.7 | LAN |
| +041+ | 3.65 | Steve Rogers | 66 | WAS |
| +044+ | 3.63 | Dave McNally | 211 | BAL |
| +046+ | 3.56 | Dock Ellis | 175.7 | PIT |
| +048+ | 3.46 | Dave Roberts | 181 | HOU |
| +051+ | 3.42 | Stan Bahnsen | 229 | CHA |
| +052+ | 3.38 | Ross Grimsley | 196 | CIN |
| +053+ | 3.33 | Bill Singer | 237.3 | ANA |
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