| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 12.39 | 197306190_ANA_CHA |
| Bill Lee | BOS | 3.47 | 197306200_BOS_MIL |
| Jim Hunter | OAK | 3.31 | 197306190_OAK_KCA |
| Nolan Ryan | ANA | 2.88 | 197306200_ANA_CHA |
| Rick Reuschel | CHN | 2.24 | 197306200_CHN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Arlin | SDN | -3.11 | 197306200_HOU_SDN |
| Jim Lonborg | PHI | -2.47 | 197306190_NYN_PHI |
| Pete Broberg | TEX | -1.94 | 197306180_TEX_MIN |
| Brent Strom | CLE | -1.72 | 197306180_DET_CLE |
| Woodie Fryman | DET | -1.37 | 197306190_DET_CLE |
Based on accumulated WAA for this season up to 1973-06-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.77 | Ken Holtzman | 138 | OAK |
| +004+ | 4.65 | Bill Lee | 116.3 | BOS |
| +005+ | 4.62 | Rick Reuschel | 112.7 | CHN |
| +007+ | 4.5 | Wilbur Wood | 176.7 | CHA |
| +008+ | 4.48 | Tom Seaver | 114.3 | NYN |
| +009+ | 4.14 | Jim Colborn | 116.7 | MIL |
| +010+ | 3.91 | Ron Bryant | 123.3 | SFN |
| +011+ | 3.81 | Wayne Twitchell | 93.7 | PHI |
| +014+ | 3.34 | Bill Singer | 134 | ANA |
| +015+ | 3.33 | Bert Blyleven | 124.7 | MIN |
| +016+ | 3.11 | Jim Palmer | 109.3 | BAL |
| +019+ | 2.94 | Don Sutton | 121.7 | LAN |
| +022+ | 2.69 | Dave McNally | 114.3 | BAL |
| +024+ | 2.63 | Rollie Fingers | 51 | OAK |
| +028+ | 2.51 | Bill Greif | 99.3 | SDN |
| +029+ | 2.46 | Paul Splittorff | 124.7 | KCA |
| +030+ | 2.44 | Jerry Koosman | 102.7 | NYN |
| +035+ | 2.33 | Nolan Ryan | 139.3 | ANA |
| +036+ | 2.3 | Jim Perry | 101 | DET |
| +040+ | 2.22 | Rick Wise | 110 | SLN |
| +043+ | 2.15 | Bob Gibson | 114 | SLN |
| +048+ | 2.02 | Sonny Siebert | 59.3 | TOT |
| +050+ | 1.99 | Ross Grimsley | 99.3 | CIN |
| +056+ | 1.91 | Ray Corbin | 56.7 | MIN |
| +064+ | 1.8 | Rudy May | 99 | ANA |
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