| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 13.02 | 197306120_CHA_DET |
| Jim Palmer | BAL | 8.45 | 197306120_KCA_BAL |
| Tom Seaver | NYN | 7.22 | 197306130_SFN_NYN |
| Bert Blyleven | MIN | 5.17 | 197306120_MIL_MIN |
| Don Sutton | LAN | 5.15 | 197306110_LAN_PHI |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Pete Broberg | TEX | -2.49 | 197306130_TEX_CLE |
| Ron Reed | ATL | -1.52 | 197306130_PIT_ATL |
| Steve Busby | KCA | -1.4 | 197306120_KCA_BAL |
| Steve Blass | PIT | -1.4 | 197306110_PIT_ATL |
| Milt Wilcox | CLE | -1.14 | 197306120_TEX_CLE |
Based on accumulated WAA for this season up to 1973-06-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.98 | Ken Holtzman | 130 | OAK |
| +004+ | 4.43 | Tom Seaver | 114.3 | NYN |
| +005+ | 4.37 | Rick Reuschel | 98 | CHN |
| +006+ | 4.29 | Bill Lee | 102.7 | BOS |
| +007+ | 4.01 | Wilbur Wood | 161.3 | CHA |
| +008+ | 4 | Jim Colborn | 107.7 | MIL |
| +009+ | 3.85 | Ron Bryant | 108 | SFN |
| +013+ | 3.13 | Wayne Twitchell | 75.7 | PHI |
| +016+ | 2.97 | Dave McNally | 106.7 | BAL |
| +017+ | 2.92 | Nolan Ryan | 124 | ANA |
| +019+ | 2.78 | Paul Splittorff | 110.3 | KCA |
| +020+ | 2.65 | Jim Palmer | 100.3 | BAL |
| +021+ | 2.61 | Bill Singer | 118 | ANA |
| +023+ | 2.57 | Jim Perry | 92 | DET |
| +024+ | 2.55 | Bert Blyleven | 115.7 | MIN |
| +025+ | 2.4 | Don Sutton | 112.7 | LAN |
| +028+ | 2.34 | Bill Greif | 93 | SDN |
| +035+ | 2.11 | Dave Roberts | 82.3 | HOU |
| +038+ | 2.09 | Alan Foster | 60.7 | SLN |
| +040+ | 2.06 | Jim Hunter | 116 | OAK |
| +042+ | 2.05 | Jerry Koosman | 93.7 | NYN |
| +041+ | 2.05 | Gaylord Perry | 137.7 | CLE |
| +047+ | 1.91 | Rollie Fingers | 42.3 | OAK |
| +055+ | 1.73 | Jerry Reuss | 102.7 | HOU |
| +057+ | 1.71 | Bob Gibson | 105 | SLN |
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