| Starter | Tm | Tier | Game |
|---|---|---|---|
| Gaylord Perry | CLE | 5.73 | 197306090_CHA_CLE |
| Don Sutton | LAN | 5.15 | 197306110_LAN_PHI |
| Ken Holtzman | OAK | 3.32 | 197306090_DET_OAK |
| Bill Lee | BOS | 2.59 | 197306100_BOS_TEX |
| Bob Gibson | SLN | 2.44 | 197306110_SLN_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Blass | PIT | -1.4 | 197306110_PIT_ATL |
| Jerry Reuss | HOU | -1.31 | 197306100_PIT_HOU |
| Steve Dunning | TEX | -0.88 | 197306090_BOS_TEX |
| Ken Brett | PHI | -0.84 | 197306090_SDN_PHI |
| Bill Parsons | MIL | -0.77 | 197306110_MIL_MIN |
Based on accumulated WAA for this season up to 1973-06-11.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.22 | Ken Holtzman | 126 | OAK |
| +003+ | 4.51 | Wilbur Wood | 153.3 | CHA |
| +005+ | 4.24 | Bill Lee | 102.7 | BOS |
| +007+ | 3.84 | Jim Colborn | 98.7 | MIL |
| +008+ | 3.84 | Tom Seaver | 105.3 | NYN |
| +009+ | 3.78 | Ron Bryant | 108 | SFN |
| +012+ | 3.55 | Rick Reuschel | 89 | CHN |
| +013+ | 3.37 | Nolan Ryan | 115 | ANA |
| +015+ | 3.1 | Wayne Twitchell | 75.7 | PHI |
| +016+ | 2.81 | Bert Blyleven | 109.3 | MIN |
| +017+ | 2.73 | Paul Splittorff | 110.3 | KCA |
| +018+ | 2.73 | Jim Palmer | 94.3 | BAL |
| +019+ | 2.71 | Dave McNally | 99 | BAL |
| +023+ | 2.57 | Bill Singer | 118 | ANA |
| +024+ | 2.54 | Jim Perry | 92 | DET |
| +027+ | 2.39 | Bill Greif | 87 | SDN |
| +029+ | 2.33 | Don Sutton | 112.7 | LAN |
| +030+ | 2.26 | Ross Grimsley | 88 | CIN |
| +039+ | 2.08 | Dave Roberts | 82.3 | HOU |
| +038+ | 2.08 | Gaylord Perry | 128.7 | CLE |
| +041+ | 2.07 | Alan Foster | 60.7 | SLN |
| +043+ | 2.02 | Jim Hunter | 116 | OAK |
| +044+ | 2.01 | Jerry Koosman | 93.7 | NYN |
| +045+ | 1.99 | Jack Billingham | 107 | CIN |
| +056+ | 1.69 | Jerry Reuss | 102.7 | HOU |
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