| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 12.39 | 197306190_ANA_CHA |
| Jim Palmer | BAL | 8.84 | 197306210_BAL_BOS |
| Bert Blyleven | MIN | 5.97 | 197306210_ANA_MIN |
| Ken Holtzman | OAK | 4.09 | 197306210_OAK_CHA |
| Mickey Lolich | DET | 3.79 | 197306210_DET_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Arlin | SDN | -3.11 | 197306200_HOU_SDN |
| Jim Lonborg | PHI | -2.47 | 197306190_NYN_PHI |
| Woodie Fryman | DET | -1.37 | 197306190_DET_CLE |
| Steve Busby | KCA | -1.17 | 197306200_OAK_KCA |
| Carl Morton | ATL | -1.11 | 197306210_ATL_LAN |
Based on accumulated WAA for this season up to 1973-06-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.02 | Ken Holtzman | 146 | OAK |
| +003+ | 4.62 | Bill Lee | 116.3 | BOS |
| +005+ | 4.6 | Rick Reuschel | 112.7 | CHN |
| +007+ | 4.47 | Wilbur Wood | 176.7 | CHA |
| +008+ | 4.46 | Tom Seaver | 114.3 | NYN |
| +009+ | 4.12 | Jim Colborn | 116.7 | MIL |
| +010+ | 4.07 | Bert Blyleven | 133.7 | MIN |
| +011+ | 3.88 | Ron Bryant | 123.3 | SFN |
| +012+ | 3.79 | Wayne Twitchell | 93.7 | PHI |
| +015+ | 3.32 | Bill Singer | 134 | ANA |
| +019+ | 2.93 | Don Sutton | 121.7 | LAN |
| +020+ | 2.81 | Jerry Koosman | 109.7 | NYN |
| +022+ | 2.71 | Jim Palmer | 112.3 | BAL |
| +025+ | 2.67 | Dave McNally | 114.3 | BAL |
| +026+ | 2.62 | Rollie Fingers | 51 | OAK |
| +029+ | 2.48 | Bob Gibson | 123 | SLN |
| +030+ | 2.43 | Paul Splittorff | 124.7 | KCA |
| +033+ | 2.33 | Jim Perry | 101 | DET |
| +035+ | 2.3 | Nolan Ryan | 139.3 | ANA |
| +039+ | 2.2 | Rick Wise | 110 | SLN |
| +047+ | 2.03 | Gaylord Perry | 155.7 | CLE |
| +050+ | 2.01 | Sonny Siebert | 59.3 | TOT |
| +051+ | 1.99 | Ross Grimsley | 99.3 | CIN |
| +059+ | 1.9 | Ray Corbin | 56.7 | MIN |
| +064+ | 1.78 | Rudy May | 99 | ANA |
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