| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 17.02 | 197305060_NYA_CHA |
| Don Sutton | LAN | 7.55 | 197305070_PIT_LAN |
| Gaylord Perry | CLE | 5.35 | 197305080_ANA_CLE |
| Jim Palmer | BAL | 4.76 | 197305060_ANA_BAL |
| Tom Seaver | NYN | 4.29 | 197305070_ATL_NYN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ron Reed | ATL | -3.11 | 197305080_ATL_NYN |
| Pete Broberg | TEX | -2.53 | 197305080_TEX_MIL |
| Jerry Reuss | HOU | -1.49 | 197305060_HOU_NYN |
| Steve Renko | WAS | -1.46 | 197305080_HOU_WAS |
| Alan Foster | SLN | -1.16 | 197305060_SLN_LAN |
Based on accumulated WAA for this season up to 1973-05-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.04 | Wilbur Wood | 73.3 | CHA |
| +002+ | 3.04 | Ken Holtzman | 62.7 | OAK |
| +005+ | 2.57 | Dave McNally | 57.3 | BAL |
| +006+ | 2.55 | Tom Seaver | 56.3 | NYN |
| +008+ | 2.33 | Bill Singer | 50.7 | ANA |
| +009+ | 2.31 | Bill Greif | 37 | SDN |
| +011+ | 2.22 | Joe Coleman | 55 | DET |
| +013+ | 2.14 | Gaylord Perry | 67 | CLE |
| +014+ | 2.14 | Ron Bryant | 54.3 | SFN |
| +022+ | 1.7 | Rudy May | 33 | ANA |
| +023+ | 1.69 | Don Sutton | 57.7 | LAN |
| +024+ | 1.63 | Ross Grimsley | 50.3 | CIN |
| +025+ | 1.63 | Rick Reuschel | 42.3 | CHN |
| +026+ | 1.56 | Nolan Ryan | 61.7 | ANA |
| +027+ | 1.54 | Jerry Reuss | 50.7 | HOU |
| +028+ | 1.52 | Jerry Koosman | 41.3 | NYN |
| +030+ | 1.49 | Jim Perry | 41 | DET |
| +031+ | 1.38 | Carl Morton | 46 | ATL |
| +037+ | 1.25 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.18 | Al Downing | 35.7 | LAN |
| XXXXX | 1.14 | Jack Billingham | 59.7 | CIN |
| XXXXX | 1.06 | Don Gullett | 53.7 | CIN |
| XXXXX | 1.04 | Paul Splittorff | 53 | KCA |
| XXXXX | 1.03 | Dick Ruthven | 31.3 | PHI |
| XXXXX | 0.97 | Roger Nelson | 29.7 | CIN |
_