| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wayne Twitchell | PHI | 4.05 | 197308280_SFN_PHI |
| Bill Lee | BOS | 3.71 | 197308290_BOS_OAK |
| Nelson Briles | PIT | 2.75 | 197308290_PIT_CIN |
| Nolan Ryan | ANA | 2.47 | 197308290_NYA_ANA |
| Jim Colborn | MIL | 1.96 | 197308290_MIL_CHA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Lonborg | PHI | -2.99 | 197308270_SFN_PHI |
| Dave Goltz | MIN | -1.9 | 197308290_MIN_DET |
| Steve Arlin | SDN | -1.76 | 197308270_SDN_NYN |
| Dick Tidrow | CLE | -1.67 | 197308290_KCA_CLE |
| Johnny Odom | OAK | -1.55 | 197308270_BOS_OAK |
Based on accumulated WAA for this season up to 1973-08-29.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.47 | Tom Seaver | 232.7 | NYN |
| +004+ | 7.13 | Don Sutton | 224.7 | LAN |
| +005+ | 7 | Wayne Twitchell | 201.7 | PHI |
| +007+ | 6.86 | Ken Holtzman | 255.3 | OAK |
| +009+ | 6.7 | Bert Blyleven | 256.7 | MIN |
| +011+ | 6.5 | Jim Palmer | 235 | BAL |
| +014+ | 5.53 | Bill Lee | 233.3 | BOS |
| +020+ | 5.07 | Rick Reuschel | 207.3 | CHN |
| +021+ | 4.9 | Terry Forster | 129.7 | CHA |
| +022+ | 4.86 | Nolan Ryan | 270 | ANA |
| +024+ | 4.85 | Jim Colborn | 255.7 | MIL |
| +031+ | 4.52 | Ron Bryant | 229.7 | SFN |
| +032+ | 4.5 | Fred Beene | 89 | NYA |
| +033+ | 4.42 | Steve Rogers | 75 | WAS |
| +034+ | 4.28 | Steve Renko | 196.7 | WAS |
| +035+ | 4.07 | Bill Singer | 246.3 | ANA |
| +036+ | 4.04 | Nelson Briles | 188.7 | PIT |
| +039+ | 3.89 | Dave Roberts | 197 | HOU |
| +040+ | 3.86 | Bob Gibson | 189 | SLN |
| +041+ | 3.82 | Claude Osteen | 212.7 | LAN |
| +042+ | 3.82 | Andy Messersmith | 217.7 | LAN |
| +046+ | 3.55 | Jack Billingham | 242.3 | CIN |
| +047+ | 3.51 | Tommy John | 178.7 | LAN |
| +048+ | 3.49 | Bob Reynolds | 89.7 | BAL |
| +056+ | 3.14 | Dave McNally | 215.3 | BAL |
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