| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 13.02 | 197306120_CHA_DET |
| Jim Palmer | BAL | 8.45 | 197306120_KCA_BAL |
| Bert Blyleven | MIN | 5.17 | 197306120_MIL_MIN |
| Don Sutton | LAN | 5.15 | 197306110_LAN_PHI |
| Nolan Ryan | ANA | 3.53 | 197306120_BOS_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Blass | PIT | -1.4 | 197306110_PIT_ATL |
| Steve Busby | KCA | -1.4 | 197306120_KCA_BAL |
| Jerry Reuss | HOU | -1.31 | 197306100_PIT_HOU |
| Milt Wilcox | CLE | -1.14 | 197306120_TEX_CLE |
| Reggie Cleveland | SLN | -0.9 | 197306120_SLN_CIN |
Based on accumulated WAA for this season up to 1973-06-12.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.25 | Ken Holtzman | 126 | OAK |
| +004+ | 4.34 | Rick Reuschel | 98 | CHN |
| +005+ | 4.27 | Bill Lee | 102.7 | BOS |
| +006+ | 3.99 | Wilbur Wood | 161.3 | CHA |
| +007+ | 3.86 | Tom Seaver | 105.3 | NYN |
| +008+ | 3.86 | Jim Colborn | 98.7 | MIL |
| +009+ | 3.82 | Ron Bryant | 108 | SFN |
| +014+ | 3.12 | Wayne Twitchell | 75.7 | PHI |
| +015+ | 2.91 | Nolan Ryan | 124 | ANA |
| +016+ | 2.77 | Paul Splittorff | 110.3 | KCA |
| +017+ | 2.73 | Dave McNally | 99 | BAL |
| +020+ | 2.63 | Jim Palmer | 100.3 | BAL |
| +021+ | 2.6 | Bill Singer | 118 | ANA |
| +023+ | 2.56 | Jim Perry | 92 | DET |
| +024+ | 2.54 | Bert Blyleven | 115.7 | MIN |
| +026+ | 2.42 | Bill Greif | 87 | SDN |
| +028+ | 2.37 | Don Sutton | 112.7 | LAN |
| +034+ | 2.12 | Gaylord Perry | 128.7 | CLE |
| +035+ | 2.1 | Dave Roberts | 82.3 | HOU |
| +037+ | 2.08 | Alan Foster | 60.7 | SLN |
| +038+ | 2.05 | Jim Hunter | 116 | OAK |
| +039+ | 2.04 | Jerry Koosman | 93.7 | NYN |
| +042+ | 2.02 | Jack Billingham | 107 | CIN |
| +054+ | 1.72 | Jerry Reuss | 102.7 | HOU |
| +055+ | 1.7 | Bob Gibson | 105 | SLN |
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