| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 12.39 | 197306190_ANA_CHA |
| Don Sutton | LAN | 4.93 | 197306170_LAN_WAS |
| Gaylord Perry | CLE | 4.16 | 197306171_KCA_CLE |
| Ken Holtzman | OAK | 4.11 | 197306170_BOS_OAK |
| Dave McNally | BAL | 4.1 | 197306170_TEX_BAL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Lonborg | PHI | -2.47 | 197306190_NYN_PHI |
| Pete Broberg | TEX | -1.94 | 197306180_TEX_MIN |
| Mike Kekich | CLE | -1.73 | 197306172_KCA_CLE |
| Rich Hand | ANA | -1.42 | 197306172_NYA_ANA |
| Woodie Fryman | DET | -1.37 | 197306190_DET_CLE |
Based on accumulated WAA for this season up to 1973-06-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.81 | Ken Holtzman | 138 | OAK |
| +004+ | 4.68 | Rick Reuschel | 106 | CHN |
| +005+ | 4.49 | Wilbur Wood | 176.7 | CHA |
| +007+ | 4.46 | Tom Seaver | 114.3 | NYN |
| +008+ | 4.29 | Bill Lee | 107.3 | BOS |
| +009+ | 4.13 | Jim Colborn | 116.7 | MIL |
| +010+ | 3.91 | Ron Bryant | 123.3 | SFN |
| +012+ | 3.67 | Wayne Twitchell | 84.7 | PHI |
| +014+ | 3.32 | Bert Blyleven | 124.7 | MIN |
| +015+ | 3.32 | Bill Singer | 134 | ANA |
| +016+ | 3.23 | Nolan Ryan | 133 | ANA |
| +018+ | 3.09 | Jim Palmer | 109.3 | BAL |
| +020+ | 2.97 | Don Sutton | 121.7 | LAN |
| +021+ | 2.67 | Dave McNally | 114.3 | BAL |
| +027+ | 2.51 | Bill Greif | 99.3 | SDN |
| +028+ | 2.51 | Paul Splittorff | 124.7 | KCA |
| +033+ | 2.42 | Jerry Koosman | 102.7 | NYN |
| +034+ | 2.37 | Dave Roberts | 90.3 | HOU |
| +035+ | 2.36 | Rollie Fingers | 47.7 | OAK |
| +037+ | 2.29 | Jim Perry | 101 | DET |
| +039+ | 2.22 | Rick Wise | 110 | SLN |
| +040+ | 2.2 | Alan Foster | 68.7 | SLN |
| +044+ | 2.15 | Bob Gibson | 114 | SLN |
| +051+ | 1.99 | Ross Grimsley | 99.3 | CIN |
| +056+ | 1.91 | Ray Corbin | 56.7 | MIN |
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