| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 12.25 | 197306220_OAK_CHA |
| Tom Seaver | NYN | 8.06 | 197306240_NYN_PIT |
| Don Sutton | LAN | 5.53 | 197306220_CIN_LAN |
| Dave McNally | BAL | 4.09 | 197306231_BAL_BOS |
| Mickey Lolich | DET | 2.97 | 197306242_DET_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Blass | PIT | -4.45 | 197306220_NYN_PIT |
| Steve Arlin | SDN | -2.83 | 197306240_ATL_SDN |
| Lloyd Allen | TEX | -2.44 | 197306242_TEX_KCA |
| Johnny Odom | OAK | -2.16 | 197306242_OAK_CHA |
| Jim Lonborg | PHI | -1.98 | 197306240_PHI_WAS |
Based on accumulated WAA for this season up to 1973-06-24.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.98 | Ken Holtzman | 146 | OAK |
| +005+ | 4.74 | Tom Seaver | 123.3 | NYN |
| +006+ | 4.54 | Bill Lee | 116.3 | BOS |
| +007+ | 4.53 | Rick Reuschel | 112.7 | CHN |
| +008+ | 4.4 | Jim Colborn | 125.7 | MIL |
| +009+ | 4.15 | Wilbur Wood | 183.7 | CHA |
| +010+ | 3.97 | Bert Blyleven | 133.7 | MIN |
| +012+ | 3.76 | Bill Singer | 142.7 | ANA |
| +013+ | 3.76 | Wayne Twitchell | 93.7 | PHI |
| +015+ | 3.44 | Ron Bryant | 128.7 | SFN |
| +017+ | 3.17 | Don Sutton | 130.3 | LAN |
| +020+ | 2.75 | Jerry Koosman | 109.7 | NYN |
| +021+ | 2.69 | Jim Palmer | 112.3 | BAL |
| +023+ | 2.61 | Rollie Fingers | 51 | OAK |
| +027+ | 2.55 | Rick Wise | 120 | SLN |
| +035+ | 2.43 | Paul Splittorff | 132.7 | KCA |
| +036+ | 2.42 | Phil Niekro | 94.7 | ATL |
| +037+ | 2.38 | Bob Gibson | 123 | SLN |
| +041+ | 2.22 | Jim Perry | 107 | DET |
| +040+ | 2.22 | Nolan Ryan | 139.3 | ANA |
| +044+ | 2.21 | Dave McNally | 116.7 | BAL |
| +046+ | 2.14 | Ross Grimsley | 106.3 | CIN |
| +050+ | 2.08 | Ray Corbin | 59.3 | MIN |
| +053+ | 2.05 | Rudy May | 105.3 | ANA |
| +054+ | 2.04 | Gaylord Perry | 155.7 | CLE |
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