| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 15.45 | 197309040_PHI_NYN |
| Bert Blyleven | MIN | 6.55 | 197309040_MIN_KCA |
| Jim Palmer | BAL | 5.36 | 197309040_BAL_BOS |
| Ken Holtzman | OAK | 4.43 | 197309040_OAK_ANA |
| Nolan Ryan | ANA | 3.98 | 197309030_OAK_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Milt Wilcox | CLE | -4.49 | 197309032_CLE_MIL |
| Jim Lonborg | PHI | -3.4 | 197309040_PHI_NYN |
| Dave Goltz | MIN | -2.99 | 197309030_MIN_KCA |
| Steve Arlin | SDN | -2.31 | 197309020_CIN_SDN |
| Bill Parsons | MIL | -1.93 | 197309032_CLE_MIL |
Based on accumulated WAA for this season up to 1973-09-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 11.73 | Tom Seaver | 251 | NYN |
| +003+ | 8.02 | Bert Blyleven | 275.7 | MIN |
| +006+ | 7.28 | Don Sutton | 224.7 | LAN |
| +008+ | 6.72 | Jim Palmer | 253.3 | BAL |
| +011+ | 6.17 | Ken Holtzman | 265 | OAK |
| +014+ | 5.8 | Wayne Twitchell | 206 | PHI |
| +015+ | 5.61 | Nolan Ryan | 279 | ANA |
| +016+ | 5.48 | Bill Lee | 242.3 | BOS |
| +021+ | 5.29 | Terry Forster | 138.7 | CHA |
| +022+ | 5.28 | Steve Rogers | 91.7 | WAS |
| +025+ | 4.95 | Rick Reuschel | 211.3 | CHN |
| +027+ | 4.76 | Dave Roberts | 206 | HOU |
| +032+ | 4.54 | Fred Beene | 89 | NYA |
| +034+ | 4.26 | Ron Bryant | 240.3 | SFN |
| +035+ | 4.21 | Steve Renko | 209.3 | WAS |
| +036+ | 4.16 | Jack Billingham | 248.3 | CIN |
| +038+ | 4.05 | Andy Messersmith | 223.7 | LAN |
| +039+ | 4.04 | Nelson Briles | 195.7 | PIT |
| +040+ | 4.01 | Dave McNally | 224.3 | BAL |
| +042+ | 3.93 | Jerry Koosman | 221.3 | NYN |
| +044+ | 3.88 | Bob Gibson | 189 | SLN |
| +045+ | 3.77 | Mel Stottlemyre | 236.3 | NYA |
| +049+ | 3.65 | Bill Singer | 261.3 | ANA |
| +056+ | 3.49 | Jim Colborn | 261.3 | MIL |
| +058+ | 3.43 | Ross Grimsley | 210.7 | CIN |
_