| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 12.91 | 197308300_NYN_SLN |
| Jim Palmer | BAL | 5.64 | 197308310_BAL_NYA |
| Wayne Twitchell | PHI | 5.57 | 197309010_WAS_PHI |
| Bert Blyleven | MIN | 5.35 | 197308300_MIN_TEX |
| Ken Holtzman | OAK | 5.1 | 197308310_OAK_KCA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Woodie Fryman | DET | -3.23 | 197309010_CLE_DET |
| Jim Lonborg | PHI | -2.87 | 197308310_WAS_PHI |
| Mike Kekich | CLE | -1.93 | 197308310_CLE_DET |
| Marty Pattin | BOS | -1.52 | 197309010_BOS_MIL |
| Bill Parsons | MIL | -1.35 | 197308312_BOS_MIL |
Based on accumulated WAA for this season up to 1973-09-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 11.08 | Tom Seaver | 242 | NYN |
| +003+ | 7.17 | Don Sutton | 224.7 | LAN |
| +004+ | 7.14 | Bert Blyleven | 266.7 | MIN |
| +010+ | 6.13 | Jim Palmer | 242.3 | BAL |
| +012+ | 5.87 | Ken Holtzman | 258 | OAK |
| +013+ | 5.72 | Wayne Twitchell | 206 | PHI |
| +015+ | 5.52 | Bill Lee | 233.3 | BOS |
| +022+ | 4.94 | Nolan Ryan | 270 | ANA |
| +024+ | 4.92 | Steve Rogers | 83 | WAS |
| +025+ | 4.91 | Terry Forster | 129.7 | CHA |
| +026+ | 4.85 | Rick Reuschel | 211.3 | CHN |
| +029+ | 4.81 | Jim Colborn | 255.7 | MIL |
| +030+ | 4.51 | Fred Beene | 89 | NYA |
| +033+ | 4.06 | Nelson Briles | 188.7 | PIT |
| +036+ | 3.94 | Dave Roberts | 197 | HOU |
| +035+ | 3.94 | Andy Messersmith | 223.7 | LAN |
| +039+ | 3.86 | Claude Osteen | 212.7 | LAN |
| +040+ | 3.86 | Bob Gibson | 189 | SLN |
| +044+ | 3.67 | Ron Bryant | 231.7 | SFN |
| +043+ | 3.67 | Bill Singer | 253 | ANA |
| +047+ | 3.58 | Jack Billingham | 242.3 | CIN |
| +049+ | 3.55 | Tommy John | 178.7 | LAN |
| +052+ | 3.46 | Steve Renko | 201.3 | WAS |
| +053+ | 3.33 | Bob Reynolds | 90 | BAL |
| +061+ | 3.19 | Mel Stottlemyre | 228.3 | NYA |
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