| Starter | Tm | Tier | Game |
|---|---|---|---|
| Don Sutton | LAN | 5.77 | 197309060_SDN_LAN |
| Wayne Twitchell | PHI | 3.58 | 197309050_PHI_NYN |
| Rick Reuschel | CHN | 2.91 | 197309060_CHN_WAS |
| Dave McNally | BAL | 2.11 | 197309070_BAL_CLE |
| Dave Roberts | HOU | 2.05 | 197309070_HOU_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Woodie Fryman | DET | -3.17 | 197309060_DET_CLE |
| Steve Arlin | SDN | -3 | 197309070_SDN_LAN |
| Johnny Odom | OAK | -1.14 | 197309070_OAK_TEX |
| Dick Tidrow | CLE | -1.09 | 197309060_DET_CLE |
| Mike Torrez | WAS | -1.04 | 197309072_NYN_WAS |
Based on accumulated WAA for this season up to 1973-09-07.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 11.7 | Tom Seaver | 251 | NYN |
| +003+ | 8.1 | Bert Blyleven | 275.7 | MIN |
| +007+ | 7.33 | Don Sutton | 231.7 | LAN |
| +008+ | 6.81 | Jim Palmer | 253.3 | BAL |
| +010+ | 6.27 | Ken Holtzman | 265 | OAK |
| +012+ | 6.1 | Wayne Twitchell | 211 | PHI |
| +015+ | 5.68 | Nolan Ryan | 279 | ANA |
| +018+ | 5.42 | Bill Lee | 243.3 | BOS |
| +019+ | 5.33 | Terry Forster | 138.7 | CHA |
| +021+ | 5.26 | Steve Rogers | 91.7 | WAS |
| +028+ | 4.57 | Fred Beene | 89 | NYA |
| +032+ | 4.51 | Dave Roberts | 212.3 | HOU |
| +033+ | 4.49 | Steve Renko | 215.3 | WAS |
| +034+ | 4.41 | Rick Reuschel | 214 | CHN |
| +035+ | 4.33 | Ron Bryant | 240.3 | SFN |
| +036+ | 4.24 | Dave McNally | 233.3 | BAL |
| +038+ | 4.21 | Jerry Koosman | 227.3 | NYN |
| +039+ | 4.21 | Jack Billingham | 248.3 | CIN |
| +041+ | 4.13 | Andy Messersmith | 223.7 | LAN |
| +042+ | 4.09 | Nelson Briles | 195.7 | PIT |
| +044+ | 3.99 | Bob Reynolds | 97 | BAL |
| +045+ | 3.94 | Bob Gibson | 189 | SLN |
| +047+ | 3.88 | Stan Bahnsen | 257.3 | CHA |
| +048+ | 3.83 | Mel Stottlemyre | 236.3 | NYA |
| +049+ | 3.72 | Bill Singer | 261.3 | ANA |
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