| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 14.98 | 197305020_BAL_CHA |
| Don Sutton | LAN | 6.44 | 197305020_CHN_LAN |
| Gaylord Perry | CLE | 5.4 | 197305040_OAK_CLE |
| Tom Seaver | NYN | 5.17 | 197305020_CIN_NYN |
| Jim Palmer | BAL | 5.1 | 197305020_BAL_CHA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ron Reed | ATL | -3.63 | 197305040_ATL_PHI |
| Reggie Cleveland | SLN | -3.18 | 197305030_SLN_SDN |
| Pete Broberg | TEX | -1.95 | 197305020_TEX_BOS |
| Ernie McAnally | WAS | -1.14 | 197305020_WAS_ATL |
| Jim Lonborg | PHI | -1.03 | 197305020_HOU_PHI |
Based on accumulated WAA for this season up to 1973-05-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 3.63 | Wilbur Wood | 64.3 | CHA |
| +002+ | 2.49 | Dave McNally | 57.3 | BAL |
| +005+ | 2.19 | Ken Holtzman | 53.7 | OAK |
| +006+ | 2.13 | Don Sutton | 51 | LAN |
| +007+ | 2.09 | Jerry Reuss | 48 | HOU |
| +009+ | 1.98 | Jim Barr | 42.3 | SFN |
| +010+ | 1.96 | Tom Seaver | 47.3 | NYN |
| +011+ | 1.95 | Rick Reuschel | 36 | CHN |
| +012+ | 1.94 | Ron Bryant | 47 | SFN |
| +013+ | 1.8 | Don Gullett | 47.3 | CIN |
| +014+ | 1.76 | Bill Greif | 28 | SDN |
| +016+ | 1.7 | Bill Singer | 41.7 | ANA |
| +019+ | 1.63 | Rudy May | 33 | ANA |
| +025+ | 1.54 | Joe Coleman | 47.7 | DET |
| +026+ | 1.47 | Jerry Koosman | 41.3 | NYN |
| +029+ | 1.42 | Jim Perry | 41 | DET |
| +033+ | 1.33 | Gaylord Perry | 58 | CLE |
| XXXXX | 1.23 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.22 | Ross Grimsley | 45.3 | CIN |
| XXXXX | 1.16 | Steve Carlton | 59 | PHI |
| XXXXX | 1.11 | Nolan Ryan | 55 | ANA |
| XXXXX | 1.07 | Jim Colborn | 25.7 | MIL |
| XXXXX | 1.04 | Harry Parker | 15.3 | NYN |
| XXXXX | 0.97 | Luke Walker | 12.3 | PIT |
| XXXXX | 0.95 | Bob Gibson | 48 | SLN |
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