| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 10.46 | 197306260_MIN_CHA |
| Jim Palmer | BAL | 7.23 | 197306260_BAL_MIL |
| Don Sutton | LAN | 5.47 | 197306260_LAN_SDN |
| Bob Gibson | SLN | 3.17 | 197306261_SLN_PHI |
| Mickey Lolich | DET | 2.99 | 197306280_MIL_DET |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Woodie Fryman | DET | -2.32 | 197306272_MIL_DET |
| Jim Lonborg | PHI | -2.32 | 197306280_PHI_NYN |
| Brent Strom | CLE | -2.1 | 197306260_NYA_CLE |
| Pete Broberg | TEX | -1.95 | 197306280_MIN_TEX |
| Steve Busby | KCA | -1.46 | 197306280_KCA_OAK |
Based on accumulated WAA for this season up to 1973-06-28.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.63 | Ken Holtzman | 149 | OAK |
| +003+ | 5.1 | Bill Lee | 125.3 | BOS |
| +006+ | 4.75 | Tom Seaver | 123.3 | NYN |
| +007+ | 4.58 | Rick Reuschel | 119.7 | CHN |
| +009+ | 4.32 | Wilbur Wood | 192.7 | CHA |
| +010+ | 4.32 | Bill Singer | 151.7 | ANA |
| +011+ | 4.06 | Bert Blyleven | 141.7 | MIN |
| +013+ | 3.94 | Don Sutton | 139.3 | LAN |
| +015+ | 3.49 | Jim Colborn | 129.7 | MIL |
| +016+ | 3.42 | Wayne Twitchell | 99.7 | PHI |
| +017+ | 3.4 | Jim Palmer | 121.3 | BAL |
| +018+ | 3.27 | Ron Bryant | 136.7 | SFN |
| +020+ | 2.92 | Dave McNally | 125.7 | BAL |
| +021+ | 2.83 | Rollie Fingers | 56 | OAK |
| +023+ | 2.78 | Paul Splittorff | 141 | KCA |
| +024+ | 2.78 | Nolan Ryan | 148.3 | ANA |
| +027+ | 2.61 | Phil Niekro | 101.7 | ATL |
| +028+ | 2.59 | Ross Grimsley | 111.3 | CIN |
| +032+ | 2.52 | Sonny Siebert | 65.3 | TOT |
| +035+ | 2.49 | Jim Perry | 115 | DET |
| +037+ | 2.41 | Gaylord Perry | 164.7 | CLE |
| +041+ | 2.34 | Jerry Koosman | 114.7 | NYN |
| +045+ | 2.31 | Clyde Wright | 125.7 | ANA |
| +056+ | 2.1 | Ray Corbin | 59.3 | MIN |
| +063+ | 1.96 | Fred Beene | 44 | NYA |
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