| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bert Blyleven | MIN | 7.93 | 197309090_CHA_MIN |
| Don Sutton | LAN | 5.54 | 197309110_LAN_CIN |
| Nolan Ryan | ANA | 4.14 | 197309110_CHA_ANA |
| Rick Reuschel | CHN | 2.39 | 197309100_PIT_CHN |
| Steve Renko | WAS | 2.21 | 197309110_WAS_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Blass | PIT | -16.49 | 197309110_PIT_CHN |
| Woodie Fryman | DET | -3.66 | 197309110_DET_MIL |
| Jim Lonborg | PHI | -2.6 | 197309110_NYN_PHI |
| Steve Busby | KCA | -1.26 | 197309100_KCA_OAK |
| Dick Tidrow | CLE | -1.19 | 197309100_CLE_NYA |
Based on accumulated WAA for this season up to 1973-09-11.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 11.85 | Tom Seaver | 259 | NYN |
| +005+ | 7.66 | Bert Blyleven | 282 | MIN |
| +007+ | 7.45 | Jim Palmer | 262.3 | BAL |
| +008+ | 7.25 | Don Sutton | 237.7 | LAN |
| +010+ | 6.35 | Nolan Ryan | 288 | ANA |
| +013+ | 6.14 | Wayne Twitchell | 211 | PHI |
| +014+ | 6.07 | Steve Rogers | 100.7 | WAS |
| +015+ | 6.06 | Ken Holtzman | 269 | OAK |
| +021+ | 5.2 | Bill Lee | 252 | BOS |
| +026+ | 5 | Steve Renko | 223 | WAS |
| +027+ | 4.87 | Terry Forster | 142.3 | CHA |
| +032+ | 4.58 | Fred Beene | 89 | NYA |
| +033+ | 4.56 | Dave Roberts | 212.3 | HOU |
| +035+ | 4.48 | Bob Reynolds | 102.3 | BAL |
| +036+ | 4.47 | Jack Billingham | 255.3 | CIN |
| +037+ | 4.34 | Dave McNally | 241 | BAL |
| +038+ | 4.31 | Andy Messersmith | 232.7 | LAN |
| +041+ | 4.23 | Nelson Briles | 201.3 | PIT |
| +042+ | 4.01 | Bob Gibson | 189 | SLN |
| +043+ | 4 | Rick Reuschel | 216 | CHN |
| +047+ | 3.76 | Jim Colborn | 277.3 | MIL |
| +049+ | 3.73 | Stan Bahnsen | 264 | CHA |
| +053+ | 3.64 | Bill Singer | 266.7 | ANA |
| +054+ | 3.64 | Jerry Koosman | 234.3 | NYN |
| +059+ | 3.49 | Ron Bryant | 244.7 | SFN |
_