| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 15.1 | 197309130_NYN_PHI |
| Bert Blyleven | MIN | 6.46 | 197309140_MIN_CHA |
| Jim Palmer | BAL | 6.36 | 197309121_MIL_BAL |
| Wayne Twitchell | PHI | 3.89 | 197309120_NYN_PHI |
| Ken Holtzman | OAK | 3.84 | 197309120_KCA_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Arlin | SDN | -2.72 | 197309130_SFN_SDN |
| Steve Busby | KCA | -1.83 | 197309140_KCA_ANA |
| Tom Timmermann | CLE | -1.77 | 197309140_CLE_BOS |
| David Clyde | TEX | -0.98 | 197309120_TEX_MIN |
| Mike Paul | CHN | -0.64 | 197309120_PIT_CHN |
Based on accumulated WAA for this season up to 1973-09-14.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 12.3 | Tom Seaver | 270 | NYN |
| +004+ | 8.41 | Bert Blyleven | 291 | MIN |
| +006+ | 7.97 | Jim Palmer | 271.3 | BAL |
| +008+ | 7.25 | Don Sutton | 237.7 | LAN |
| +010+ | 6.63 | Steve Rogers | 109.7 | WAS |
| +012+ | 6.31 | Nolan Ryan | 288 | ANA |
| +013+ | 6.28 | Wayne Twitchell | 218 | PHI |
| +018+ | 5.73 | Bill Lee | 261.3 | BOS |
| +019+ | 5.66 | Ken Holtzman | 277 | OAK |
| +028+ | 4.97 | Steve Renko | 223 | WAS |
| +029+ | 4.85 | Andy Messersmith | 241.7 | LAN |
| +030+ | 4.78 | Bob Reynolds | 106 | BAL |
| +031+ | 4.58 | Jack Billingham | 264.3 | CIN |
| +034+ | 4.52 | Nelson Briles | 207.3 | PIT |
| +037+ | 4.3 | Terry Forster | 150.3 | CHA |
| +038+ | 4.29 | Dave McNally | 241 | BAL |
| +040+ | 4.26 | Jim Colborn | 285.3 | MIL |
| +041+ | 4.06 | Lindy McDaniel | 145 | NYA |
| +043+ | 4 | Dave Roberts | 218.3 | HOU |
| +044+ | 3.99 | Bob Gibson | 189 | SLN |
| +046+ | 3.97 | Rick Reuschel | 216 | CHN |
| +057+ | 3.57 | Doc Medich | 210.3 | NYA |
| +058+ | 3.56 | Jerry Koosman | 234.3 | NYN |
| +060+ | 3.48 | Stan Bahnsen | 271 | CHA |
| +064+ | 3.34 | Bill Singer | 275.7 | ANA |
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