| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 16.67 | 197305170_CHA_MIN |
| Jim Palmer | BAL | 8.07 | 197305170_BAL_CLE |
| Gaylord Perry | CLE | 7.27 | 197305170_BAL_CLE |
| Tom Seaver | NYN | 7.04 | 197305180_PIT_NYN |
| Don Sutton | LAN | 5.98 | 197305170_LAN_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wayne Simpson | KCA | -4.58 | 197305170_KCA_TEX |
| Ken Brett | PHI | -2.62 | 197305191_CHN_PHI |
| Ron Reed | ATL | -2.58 | 197305180_LAN_ATL |
| Bill Champion | MIL | -2.12 | 197305180_MIL_NYA |
| Rich Gossage | CHA | -1.87 | 197305180_MIN_CHA |
Based on accumulated WAA for this season up to 1973-05-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.27 | Ken Holtzman | 87.7 | OAK |
| +002+ | 3.92 | Wilbur Wood | 100 | CHA |
| +003+ | 3.53 | Bill Singer | 80.7 | ANA |
| +004+ | 3.45 | Tom Seaver | 74.3 | NYN |
| +008+ | 2.63 | Rick Reuschel | 59 | CHN |
| +009+ | 2.58 | Ron Bryant | 68.7 | SFN |
| +013+ | 2.45 | Jim Perry | 62.7 | DET |
| +014+ | 2.38 | Joe Coleman | 77 | DET |
| +015+ | 2.26 | Jim Palmer | 60.7 | BAL |
| +016+ | 2.21 | Jerry Reuss | 66.3 | HOU |
| +018+ | 2.11 | Gaylord Perry | 82.7 | CLE |
| +022+ | 2.03 | Jerry Koosman | 57.3 | NYN |
| +023+ | 2.03 | Jack Billingham | 77.7 | CIN |
| +025+ | 1.96 | Nolan Ryan | 82 | ANA |
| +026+ | 1.95 | Dave McNally | 69.7 | BAL |
| +028+ | 1.88 | Paul Splittorff | 70.3 | KCA |
| +029+ | 1.86 | Doyle Alexander | 53.3 | BAL |
| +032+ | 1.72 | Bill Greif | 51.7 | SDN |
| +033+ | 1.7 | Rudy May | 51 | ANA |
| +035+ | 1.66 | Don Sutton | 72 | LAN |
| +039+ | 1.58 | Bill Lee | 58 | BOS |
| +048+ | 1.34 | Rollie Fingers | 29 | OAK |
| +051+ | 1.27 | Dave Roberts | 57.3 | HOU |
| +053+ | 1.25 | Rogelio Moret | 14.7 | BOS |
| +052+ | 1.25 | Bruce DalCanton | 42.7 | KCA |
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