| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 11.92 | 197306150_MIL_CHA |
| Jim Palmer | BAL | 7.73 | 197306160_TEX_BAL |
| Bert Blyleven | MIN | 4.66 | 197306160_MIN_DET |
| Bill Lee | BOS | 3.75 | 197306160_BOS_OAK |
| Jim Hunter | OAK | 3.17 | 197306150_BOS_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Arlin | SDN | -2.85 | 197306150_SDN_NYN |
| Steve Busby | KCA | -1.41 | 197306160_KCA_CLE |
| Dick Bosman | CLE | -1.22 | 197306160_KCA_CLE |
| Steve Dunning | TEX | -1.11 | 197306160_TEX_BAL |
| Bill Parsons | MIL | -0.74 | 197306160_MIL_CHA |
Based on accumulated WAA for this season up to 1973-06-16.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.93 | Ken Holtzman | 130 | OAK |
| +004+ | 4.61 | Rick Reuschel | 106 | CHN |
| +005+ | 4.53 | Wilbur Wood | 170.3 | CHA |
| +006+ | 4.39 | Tom Seaver | 114.3 | NYN |
| +007+ | 4.28 | Bill Lee | 107.3 | BOS |
| +009+ | 4 | Ron Bryant | 117.7 | SFN |
| +010+ | 4 | Jim Colborn | 107.7 | MIL |
| +012+ | 3.64 | Wayne Twitchell | 84.7 | PHI |
| +014+ | 3.27 | Bert Blyleven | 124.7 | MIN |
| +015+ | 3.2 | Nolan Ryan | 133 | ANA |
| +016+ | 3.16 | Jim Palmer | 109.3 | BAL |
| +018+ | 3.07 | Paul Splittorff | 119.3 | KCA |
| +019+ | 2.93 | Dave McNally | 106.7 | BAL |
| +022+ | 2.72 | Bill Singer | 125 | ANA |
| +025+ | 2.44 | Don Sutton | 112.7 | LAN |
| +029+ | 2.36 | Jim Hunter | 125 | OAK |
| +031+ | 2.35 | Jerry Koosman | 102.7 | NYN |
| +033+ | 2.34 | Dave Roberts | 90.3 | HOU |
| +034+ | 2.33 | Bill Greif | 93 | SDN |
| +042+ | 2.13 | Alan Foster | 68.7 | SLN |
| +044+ | 2.04 | Bob Gibson | 114 | SLN |
| +050+ | 1.96 | Gaylord Perry | 137.7 | CLE |
| +051+ | 1.92 | Rollie Fingers | 42.7 | OAK |
| +055+ | 1.81 | Phil Niekro | 77.7 | ATL |
| +060+ | 1.7 | Jim Perry | 92 | DET |
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