| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 18.28 | 197305100_CHA_ANA |
| Gaylord Perry | CLE | 5.35 | 197305080_ANA_CLE |
| Dave McNally | BAL | 3.69 | 197305090_OAK_BAL |
| Bob Gibson | SLN | 2.82 | 197305080_SLN_SFN |
| Joe Coleman | DET | 2.53 | 197305100_DET_KCA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ron Reed | ATL | -3.11 | 197305080_ATL_NYN |
| Pete Broberg | TEX | -2.53 | 197305080_TEX_MIL |
| Sam McDowell | SFN | -2.21 | 197305100_SLN_SFN |
| Reggie Cleveland | SLN | -1.98 | 197305090_SLN_SFN |
| Mike Corkins | SDN | -1.77 | 197305090_CHN_SDN |
Based on accumulated WAA for this season up to 1973-05-10.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.29 | Wilbur Wood | 84.3 | CHA |
| +002+ | 3.65 | Ken Holtzman | 69.7 | OAK |
| +003+ | 2.79 | Dave McNally | 67.3 | BAL |
| +006+ | 2.62 | Bill Singer | 61.7 | ANA |
| +007+ | 2.6 | Tom Seaver | 56.3 | NYN |
| +010+ | 2.34 | Bill Greif | 37 | SDN |
| +009+ | 2.34 | Ron Bryant | 61.3 | SFN |
| +012+ | 2.21 | Gaylord Perry | 67 | CLE |
| +016+ | 2.1 | Jerry Koosman | 50.3 | NYN |
| +018+ | 1.99 | Jim Perry | 49 | DET |
| +022+ | 1.74 | Don Sutton | 57.7 | LAN |
| +026+ | 1.67 | Ross Grimsley | 50.3 | CIN |
| +027+ | 1.66 | Rick Reuschel | 42.3 | CHN |
| +028+ | 1.58 | Jerry Reuss | 50.7 | HOU |
| +030+ | 1.57 | Nolan Ryan | 61.7 | ANA |
| +033+ | 1.36 | Joe Coleman | 59 | DET |
| +036+ | 1.32 | Rudy May | 36 | ANA |
| +040+ | 1.26 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.22 | Jim Colborn | 39.3 | MIL |
| XXXXX | 1.21 | Al Downing | 35.7 | LAN |
| XXXXX | 1.18 | Jack Billingham | 59.7 | CIN |
| XXXXX | 1.09 | Fritz Peterson | 43.7 | NYA |
| XXXXX | 1.08 | Paul Splittorff | 53 | KCA |
| XXXXX | 1.06 | Dick Ruthven | 31.3 | PHI |
| XXXXX | 1.06 | Reggie Cleveland | 42.3 | SLN |
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