| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 18.2 | 197305140_CHA_OAK |
| Dave McNally | BAL | 4.06 | 197305132_BAL_NYA |
| Don Wilson | HOU | 2.07 | 197305150_ATL_HOU |
| Bert Blyleven | MIN | 1.95 | 197305150_MIN_TEX |
| Bob Gibson | SLN | 1.85 | 197305130_WAS_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ken Brett | PHI | -3.44 | 197305140_PHI_SLN |
| Ron Reed | ATL | -2.65 | 197305132_SDN_ATL |
| Bill Champion | MIL | -2.13 | 197305140_CLE_MIL |
| Rich Gossage | CHA | -2.12 | 197305130_CHA_ANA |
| Mike Corkins | SDN | -2.11 | 197305140_SFN_SDN |
Based on accumulated WAA for this season up to 1973-05-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.14 | Ken Holtzman | 78.7 | OAK |
| +002+ | 3.89 | Wilbur Wood | 92.3 | CHA |
| +003+ | 3.35 | Tom Seaver | 65.3 | NYN |
| +005+ | 3 | Bill Singer | 71.7 | ANA |
| +008+ | 2.54 | Ron Bryant | 68.7 | SFN |
| +010+ | 2.4 | Gaylord Perry | 76 | CLE |
| +011+ | 2.4 | Rick Reuschel | 51.3 | CHN |
| +012+ | 2.27 | Bill Greif | 46 | SDN |
| +017+ | 2.07 | Joe Coleman | 68 | DET |
| +018+ | 2.06 | Jerry Koosman | 57.3 | NYN |
| +019+ | 2.05 | Rudy May | 45 | ANA |
| +020+ | 2 | Jerry Reuss | 58.3 | HOU |
| +021+ | 1.96 | Jack Billingham | 68.7 | CIN |
| +022+ | 1.95 | Dave McNally | 69.7 | BAL |
| +029+ | 1.73 | Jim Palmer | 51.7 | BAL |
| +030+ | 1.72 | Jim Perry | 53.7 | DET |
| +036+ | 1.51 | Bill Lee | 50 | BOS |
| +037+ | 1.5 | Ross Grimsley | 55.7 | CIN |
| +040+ | 1.44 | Al Downing | 43.3 | LAN |
| +039+ | 1.44 | Don Sutton | 64 | LAN |
| +041+ | 1.44 | Mel Stottlemyre | 62.7 | NYA |
| +042+ | 1.43 | Nolan Ryan | 73 | ANA |
| +043+ | 1.38 | Paul Splittorff | 62 | KCA |
| +045+ | 1.33 | Doyle Alexander | 44.3 | BAL |
| XXXXX | 1.24 | Rogelio Moret | 14.7 | BOS |
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