| Starter | Tm | Tier | Game |
|---|---|---|---|
| Don Sutton | LAN | 7.55 | 197305070_PIT_LAN |
| Gaylord Perry | CLE | 5.35 | 197305080_ANA_CLE |
| Tom Seaver | NYN | 4.29 | 197305070_ATL_NYN |
| Dave McNally | BAL | 3.69 | 197305090_OAK_BAL |
| Bob Gibson | SLN | 2.82 | 197305080_SLN_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ron Reed | ATL | -3.11 | 197305080_ATL_NYN |
| Pete Broberg | TEX | -2.53 | 197305080_TEX_MIL |
| Reggie Cleveland | SLN | -1.98 | 197305090_SLN_SFN |
| Mike Corkins | SDN | -1.77 | 197305090_CHN_SDN |
| Steve Renko | WAS | -1.46 | 197305080_HOU_WAS |
Based on accumulated WAA for this season up to 1973-05-09.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.06 | Wilbur Wood | 73.3 | CHA |
| +002+ | 3.04 | Ken Holtzman | 62.7 | OAK |
| +003+ | 2.75 | Dave McNally | 67.3 | BAL |
| +007+ | 2.57 | Tom Seaver | 56.3 | NYN |
| +008+ | 2.36 | Bill Singer | 50.7 | ANA |
| +009+ | 2.32 | Bill Greif | 37 | SDN |
| +010+ | 2.31 | Ron Bryant | 61.3 | SFN |
| +012+ | 2.24 | Joe Coleman | 55 | DET |
| +013+ | 2.16 | Gaylord Perry | 67 | CLE |
| +017+ | 2.07 | Jerry Koosman | 50.3 | NYN |
| +020+ | 1.95 | Jim Perry | 49 | DET |
| +023+ | 1.71 | Don Sutton | 57.7 | LAN |
| +026+ | 1.64 | Ross Grimsley | 50.3 | CIN |
| +027+ | 1.64 | Rick Reuschel | 42.3 | CHN |
| +028+ | 1.61 | Nolan Ryan | 61.7 | ANA |
| +031+ | 1.56 | Jerry Reuss | 50.7 | HOU |
| +035+ | 1.34 | Rudy May | 36 | ANA |
| +038+ | 1.26 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.2 | Al Downing | 35.7 | LAN |
| XXXXX | 1.2 | Jim Colborn | 39.3 | MIL |
| XXXXX | 1.15 | Jack Billingham | 59.7 | CIN |
| XXXXX | 1.06 | Fritz Peterson | 43.7 | NYA |
| XXXXX | 1.05 | Paul Splittorff | 53 | KCA |
| XXXXX | 1.04 | Dick Ruthven | 31.3 | PHI |
| XXXXX | 1.03 | Reggie Cleveland | 42.3 | SLN |
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