| 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 |
| Pete Broberg | TEX | -2.75 | 197305160_KCA_TEX |
| 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 1973-05-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.24 | Ken Holtzman | 87.7 | OAK |
| +002+ | 3.89 | Wilbur Wood | 100 | CHA |
| +003+ | 3.5 | Bill Singer | 80.7 | ANA |
| +004+ | 3.44 | Tom Seaver | 74.3 | NYN |
| +008+ | 2.59 | Rick Reuschel | 59 | CHN |
| +010+ | 2.54 | Ron Bryant | 68.7 | SFN |
| +012+ | 2.43 | Jim Perry | 62.7 | DET |
| +013+ | 2.23 | Jim Palmer | 60.7 | BAL |
| +015+ | 2.18 | Jerry Reuss | 66.3 | HOU |
| +017+ | 2.08 | Gaylord Perry | 82.7 | CLE |
| +019+ | 2.03 | Jerry Koosman | 57.3 | NYN |
| +020+ | 2.03 | Joe Coleman | 68 | DET |
| +021+ | 2.01 | Jack Billingham | 77.7 | CIN |
| +022+ | 1.92 | Dave McNally | 69.7 | BAL |
| +025+ | 1.86 | Paul Splittorff | 70.3 | KCA |
| +028+ | 1.83 | Don Sutton | 72 | LAN |
| +031+ | 1.69 | Bill Greif | 51.7 | SDN |
| +032+ | 1.68 | Rudy May | 51 | ANA |
| +039+ | 1.5 | Bill Lee | 50 | BOS |
| +043+ | 1.4 | Nolan Ryan | 73 | ANA |
| +046+ | 1.32 | Doyle Alexander | 44.3 | BAL |
| XXXXX | 1.25 | Dave Roberts | 57.3 | HOU |
| XXXXX | 1.24 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.24 | Bruce DalCanton | 42.7 | KCA |
| XXXXX | 1.22 | Rollie Fingers | 27.7 | OAK |
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