| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 17.87 | 197306010_CHA_MIL |
| Jim Palmer | BAL | 9 | 197306020_BAL_TEX |
| Tom Seaver | NYN | 7.55 | 197306030_NYN_SDN |
| Don Sutton | LAN | 6.66 | 197306010_WAS_LAN |
| Gaylord Perry | CLE | 5.7 | 197306030_CLE_KCA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Pete Broberg | TEX | -2.24 | 197306030_BAL_TEX |
| Mike Kekich | NYA | -1.82 | 197306010_ANA_NYA |
| Ron Reed | ATL | -1.75 | 197306030_ATL_CHN |
| Jerry Reuss | HOU | -1.46 | 197306010_HOU_SLN |
| Steve Busby | KCA | -1.37 | 197306030_CLE_KCA |
Based on accumulated WAA for this season up to 1973-06-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.09 | Ken Holtzman | 109.7 | OAK |
| +002+ | 4.7 | Wilbur Wood | 136.7 | CHA |
| +004+ | 4.12 | Tom Seaver | 98.3 | NYN |
| +007+ | 3.41 | Rick Reuschel | 81.3 | CHN |
| +008+ | 3.41 | Bill Singer | 105 | ANA |
| +010+ | 2.91 | Bill Lee | 83.7 | BOS |
| +011+ | 2.89 | Don Sutton | 99 | LAN |
| +012+ | 2.88 | Ron Bryant | 92.3 | SFN |
| +014+ | 2.82 | Bill Greif | 74.7 | SDN |
| +015+ | 2.6 | Jim Palmer | 87 | BAL |
| +017+ | 2.57 | Jim Perry | 79.7 | DET |
| +019+ | 2.52 | Gaylord Perry | 119.7 | CLE |
| +022+ | 2.44 | Nolan Ryan | 106 | ANA |
| +023+ | 2.41 | Paul Splittorff | 101.3 | KCA |
| +025+ | 2.31 | Jim Colborn | 82.3 | MIL |
| +028+ | 2.22 | Dave McNally | 90 | BAL |
| +031+ | 2.09 | Joe Coleman | 99.3 | DET |
| +032+ | 1.99 | Bert Blyleven | 100.3 | MIN |
| +034+ | 1.94 | Gene Garber | 50.7 | KCA |
| +035+ | 1.86 | Ross Grimsley | 80 | CIN |
| +038+ | 1.79 | Alan Foster | 46.3 | SLN |
| +046+ | 1.54 | Rollie Fingers | 36.3 | OAK |
| +050+ | 1.48 | Jim Slaton | 67 | MIL |
| +051+ | 1.47 | Wayne Twitchell | 57.7 | PHI |
| +057+ | 1.39 | Don Gullett | 84.3 | CIN |
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