| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 18.2 | 197305140_CHA_OAK |
| Gaylord Perry | CLE | 6.45 | 197305120_CLE_BOS |
| Don Sutton | LAN | 6.27 | 197305120_LAN_SFN |
| Tom Seaver | NYN | 5 | 197305120_NYN_PIT |
| Dave McNally | BAL | 4.06 | 197305132_BAL_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ken Brett | PHI | -3.44 | 197305140_PHI_SLN |
| Ron Reed | ATL | -2.65 | 197305132_SDN_ATL |
| Pete Broberg | TEX | -2.54 | 197305120_OAK_TEX |
| Bill Champion | MIL | -2.13 | 197305140_CLE_MIL |
| Rich Gossage | CHA | -2.12 | 197305130_CHA_ANA |
Based on accumulated WAA for this season up to 1973-05-14.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.2 | Ken Holtzman | 78.7 | OAK |
| +002+ | 3.99 | Wilbur Wood | 92.3 | CHA |
| +003+ | 3.34 | Tom Seaver | 65.3 | NYN |
| +005+ | 3 | Bill Singer | 71.7 | ANA |
| +008+ | 2.57 | Gaylord Perry | 76 | CLE |
| +010+ | 2.4 | Rick Reuschel | 51.3 | CHN |
| +011+ | 2.38 | Ron Bryant | 61.7 | SFN |
| +013+ | 2.28 | Bill Greif | 46 | SDN |
| +017+ | 2.09 | Jerry Koosman | 50.3 | NYN |
| +018+ | 2.08 | Joe Coleman | 68 | DET |
| +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 |
| +028+ | 1.73 | Jim Palmer | 51.7 | BAL |
| +029+ | 1.73 | Jim Perry | 53.7 | DET |
| +035+ | 1.52 | Bill Lee | 50 | BOS |
| +036+ | 1.51 | Ross Grimsley | 55.7 | CIN |
| +038+ | 1.44 | Mel Stottlemyre | 62.7 | NYA |
| +041+ | 1.43 | Al Downing | 43.3 | LAN |
| +040+ | 1.43 | Don Sutton | 64 | LAN |
| +042+ | 1.4 | Bruce DalCanton | 37 | KCA |
| +043+ | 1.38 | Paul Splittorff | 62 | KCA |
| +047+ | 1.34 | Doyle Alexander | 44.3 | BAL |
| XXXXX | 1.25 | Rogelio Moret | 14.7 | BOS |
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