| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 15.57 | 197305201_MIN_CHA |
| Jim Palmer | BAL | 9.02 | 197305210_BOS_BAL |
| Don Sutton | LAN | 6.11 | 197305220_SDN_LAN |
| Gaylord Perry | CLE | 5.84 | 197305210_NYA_CLE |
| Bob Gibson | SLN | 2.38 | 197305201_SLN_WAS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wayne Simpson | KCA | -3.92 | 197305220_KCA_MIN |
| Reggie Cleveland | SLN | -2.24 | 197305202_SLN_WAS |
| Johnny Odom | OAK | -1.62 | 197305200_KCA_OAK |
| Mike Kekich | NYA | -1.48 | 197305202_NYA_CLE |
| Jerry Reuss | HOU | -1.09 | 197305200_SFN_HOU |
Based on accumulated WAA for this season up to 1973-05-22.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.03 | Ken Holtzman | 96.7 | OAK |
| +003+ | 4.06 | Wilbur Wood | 109 | CHA |
| +004+ | 3.56 | Bill Singer | 80.7 | ANA |
| +005+ | 3.45 | Tom Seaver | 74.3 | NYN |
| +009+ | 2.62 | Rick Reuschel | 59 | CHN |
| +012+ | 2.41 | Joe Coleman | 77 | DET |
| +014+ | 2.32 | Jim Perry | 68.3 | DET |
| +015+ | 2.25 | Paul Splittorff | 79.3 | KCA |
| +016+ | 2.23 | Ron Bryant | 74.3 | SFN |
| +017+ | 2.19 | Don Sutton | 81 | LAN |
| +019+ | 2.11 | Jim Palmer | 69 | BAL |
| +021+ | 2.04 | Jack Billingham | 77.7 | CIN |
| +023+ | 1.99 | Nolan Ryan | 82 | ANA |
| +025+ | 1.87 | Doyle Alexander | 53.3 | BAL |
| +028+ | 1.82 | Gaylord Perry | 91.7 | CLE |
| +029+ | 1.79 | Mel Stottlemyre | 77 | NYA |
| +037+ | 1.68 | Jerry Reuss | 72.3 | HOU |
| +040+ | 1.63 | Bill Greif | 57.7 | SDN |
| +041+ | 1.62 | Dave McNally | 78.3 | BAL |
| +042+ | 1.58 | Bill Lee | 58 | BOS |
| +044+ | 1.55 | Ross Grimsley | 66.7 | CIN |
| +045+ | 1.55 | Rudy May | 59 | ANA |
| +046+ | 1.52 | Jerry Koosman | 63.7 | NYN |
| +047+ | 1.49 | Jim Colborn | 64.3 | MIL |
| +052+ | 1.34 | Rollie Fingers | 29 | OAK |
_