| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 15.45 | 197309040_PHI_NYN |
| Bert Blyleven | MIN | 6.55 | 197309040_MIN_KCA |
| Jim Palmer | BAL | 5.36 | 197309040_BAL_BOS |
| Ken Holtzman | OAK | 4.43 | 197309040_OAK_ANA |
| Nolan Ryan | ANA | 3.98 | 197309030_OAK_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Milt Wilcox | CLE | -4.49 | 197309032_CLE_MIL |
| Jim Lonborg | PHI | -3.4 | 197309040_PHI_NYN |
| Dave Goltz | MIN | -2.99 | 197309030_MIN_KCA |
| Bill Parsons | MIL | -1.93 | 197309032_CLE_MIL |
| Johnny Odom | OAK | -1.44 | 197309030_OAK_ANA |
Based on accumulated WAA for this season up to 1973-09-05.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 11.76 | Tom Seaver | 251 | NYN |
| +003+ | 8.05 | Bert Blyleven | 275.7 | MIN |
| +007+ | 7.32 | Don Sutton | 224.7 | LAN |
| +008+ | 6.76 | Jim Palmer | 253.3 | BAL |
| +011+ | 6.2 | Ken Holtzman | 265 | OAK |
| +012+ | 6.06 | Wayne Twitchell | 211 | PHI |
| +015+ | 5.63 | Nolan Ryan | 279 | ANA |
| +018+ | 5.38 | Bill Lee | 243.3 | BOS |
| +019+ | 5.3 | Terry Forster | 138.7 | CHA |
| +021+ | 5.28 | Steve Rogers | 91.7 | WAS |
| +025+ | 4.96 | Rick Reuschel | 211.3 | CHN |
| +027+ | 4.75 | Dave Roberts | 206 | HOU |
| +033+ | 4.55 | Fred Beene | 89 | NYA |
| +034+ | 4.28 | Ron Bryant | 240.3 | SFN |
| +035+ | 4.23 | Steve Renko | 209.3 | WAS |
| +037+ | 4.14 | Jack Billingham | 248.3 | CIN |
| +038+ | 4.08 | Andy Messersmith | 223.7 | LAN |
| +039+ | 4.05 | Nelson Briles | 195.7 | PIT |
| +040+ | 4.04 | Dave McNally | 224.3 | BAL |
| +041+ | 3.97 | Bob Reynolds | 97 | BAL |
| +043+ | 3.95 | Jerry Koosman | 221.3 | NYN |
| +044+ | 3.89 | Bob Gibson | 189 | SLN |
| +046+ | 3.79 | Mel Stottlemyre | 236.3 | NYA |
| +050+ | 3.67 | Bill Singer | 261.3 | ANA |
| +055+ | 3.51 | Jim Colborn | 261.3 | MIL |
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