| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 17.87 | 197306010_CHA_MIL |
| Jim Palmer | BAL | 9 | 197306020_BAL_TEX |
| Don Sutton | LAN | 6.66 | 197306010_WAS_LAN |
| Bert Blyleven | MIN | 3.64 | 197306020_DET_MIN |
| Bob Gibson | SLN | 2.5 | 197305310_CIN_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Kekich | NYA | -1.82 | 197306010_ANA_NYA |
| Brent Strom | CLE | -1.67 | 197305310_CLE_TEX |
| Jerry Reuss | HOU | -1.46 | 197306010_HOU_SLN |
| Reggie Cleveland | SLN | -1.21 | 197306010_HOU_SLN |
| Woodie Fryman | DET | -1.19 | 197306020_DET_MIN |
Based on accumulated WAA for this season up to 1973-06-02.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.11 | Ken Holtzman | 109.7 | OAK |
| +002+ | 4.69 | Wilbur Wood | 136.7 | CHA |
| +005+ | 3.81 | Tom Seaver | 89.3 | NYN |
| +008+ | 3.42 | Rick Reuschel | 81.3 | CHN |
| +009+ | 3.41 | Bill Singer | 105 | ANA |
| +011+ | 2.93 | Bill Lee | 83.7 | BOS |
| +012+ | 2.9 | Ron Bryant | 92.3 | SFN |
| +013+ | 2.9 | Don Sutton | 99 | LAN |
| +014+ | 2.84 | Bill Greif | 74.7 | SDN |
| +015+ | 2.58 | Jim Perry | 79.7 | DET |
| +017+ | 2.54 | Jim Palmer | 87 | BAL |
| +022+ | 2.44 | Nolan Ryan | 106 | ANA |
| +023+ | 2.43 | Paul Splittorff | 101.3 | KCA |
| +024+ | 2.4 | Gaylord Perry | 113 | CLE |
| +027+ | 2.33 | Jim Colborn | 82.3 | MIL |
| +030+ | 2.1 | Joe Coleman | 99.3 | DET |
| +032+ | 2.01 | Bert Blyleven | 100.3 | MIN |
| +033+ | 1.95 | Gene Garber | 50.7 | KCA |
| +036+ | 1.88 | Ross Grimsley | 80 | CIN |
| +037+ | 1.81 | Alan Foster | 46.3 | SLN |
| +040+ | 1.75 | Dave McNally | 85 | BAL |
| +046+ | 1.54 | Rollie Fingers | 36.3 | OAK |
| +049+ | 1.49 | Jim Slaton | 67 | MIL |
| +051+ | 1.48 | Wayne Twitchell | 57.7 | PHI |
| +055+ | 1.4 | Don Gullett | 84.3 | CIN |
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