| Starter | Tm | Tier | Game |
|---|---|---|---|
| Don Sutton | LAN | 5.57 | 197307280_SFN_LAN |
| Wilbur Wood | CHA | 4.87 | 197307290_CHA_MIN |
| Bob Gibson | SLN | 3.22 | 197307300_SLN_CHN |
| Nolan Ryan | ANA | 2.68 | 197307292_ANA_KCA |
| Wayne Twitchell | PHI | 2.23 | 197307280_PHI_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Mike Kekich | CLE | -3.03 | 197307280_BOS_CLE |
| Steve Dunning | TEX | -2.83 | 197307280_TEX_OAK |
| Johnny Odom | OAK | -2.55 | 197307280_TEX_OAK |
| Mike Torrez | WAS | -1.21 | 197307280_WAS_NYN |
| Barry Lersch | PHI | -0.82 | 197307292_PHI_PIT |
Based on accumulated WAA for this season up to 1973-07-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 7.27 | Tom Seaver | 178.7 | NYN |
| +003+ | 6.63 | Ken Holtzman | 205.7 | OAK |
| +007+ | 5.42 | Wayne Twitchell | 146.7 | PHI |
| +008+ | 5.32 | Bert Blyleven | 200 | MIN |
| +010+ | 5.06 | Don Sutton | 186 | LAN |
| +015+ | 4.48 | Bill Lee | 175.3 | BOS |
| +016+ | 4.41 | Rick Reuschel | 166.7 | CHN |
| +019+ | 4.04 | Dave McNally | 172.7 | BAL |
| +021+ | 4.01 | Stan Bahnsen | 194.7 | CHA |
| +022+ | 3.94 | Jim Colborn | 192.7 | MIL |
| +023+ | 3.92 | Jim Palmer | 178.7 | BAL |
| +024+ | 3.84 | Nolan Ryan | 211.3 | ANA |
| +025+ | 3.79 | Bob Gibson | 187 | SLN |
| +028+ | 3.69 | Ross Grimsley | 156.7 | CIN |
| +029+ | 3.59 | Wilbur Wood | 260.3 | CHA |
| +030+ | 3.52 | Fred Beene | 75.3 | NYA |
| +031+ | 3.46 | Jack Billingham | 188 | CIN |
| +036+ | 3.25 | Bill Singer | 199.7 | ANA |
| +041+ | 2.99 | Steve Renko | 150 | WAS |
| +043+ | 2.93 | Nelson Briles | 149.7 | PIT |
| +044+ | 2.92 | Lindy McDaniel | 99.3 | NYA |
| +045+ | 2.92 | Dave Roberts | 152.7 | HOU |
| +052+ | 2.78 | Ron Bryant | 181.7 | SFN |
| +056+ | 2.68 | Tommy John | 126.7 | LAN |
| +063+ | 2.52 | Rick Wise | 162.7 | SLN |
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