| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wayne Twitchell | PHI | 5.57 | 197309010_WAS_PHI |
| Nolan Ryan | ANA | 3.98 | 197309030_OAK_ANA |
| Bill Lee | BOS | 3.46 | 197309020_BOS_MIL |
| Terry Forster | CHA | 2.77 | 197309032_TEX_CHA |
| Jim Colborn | MIL | 2.7 | 197309020_BOS_MIL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Milt Wilcox | CLE | -4.49 | 197309032_CLE_MIL |
| Woodie Fryman | DET | -3.23 | 197309010_CLE_DET |
| Dave Goltz | MIN | -2.99 | 197309030_MIN_KCA |
| Steve Arlin | SDN | -2.31 | 197309020_CIN_SDN |
| Bill Parsons | MIL | -1.93 | 197309032_CLE_MIL |
Based on accumulated WAA for this season up to 1973-09-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 11.19 | Tom Seaver | 242 | NYN |
| +005+ | 7.28 | Don Sutton | 224.7 | LAN |
| +006+ | 7.27 | Bert Blyleven | 266.7 | MIN |
| +010+ | 6.25 | Jim Palmer | 242.3 | BAL |
| +011+ | 6.01 | Ken Holtzman | 258 | OAK |
| +014+ | 5.81 | Wayne Twitchell | 206 | PHI |
| +015+ | 5.64 | Nolan Ryan | 279 | ANA |
| +016+ | 5.56 | Bill Lee | 242.3 | BOS |
| +019+ | 5.31 | Terry Forster | 138.7 | CHA |
| +024+ | 4.95 | Rick Reuschel | 211.3 | CHN |
| +025+ | 4.95 | Steve Rogers | 83 | WAS |
| +027+ | 4.79 | Dave Roberts | 206 | HOU |
| +031+ | 4.55 | Fred Beene | 89 | NYA |
| +034+ | 4.23 | Steve Renko | 209.3 | WAS |
| +035+ | 4.2 | Jack Billingham | 248.3 | CIN |
| +036+ | 4.06 | Dave McNally | 224.3 | BAL |
| +037+ | 4.06 | Nelson Briles | 195.7 | PIT |
| +038+ | 4.05 | Andy Messersmith | 223.7 | LAN |
| +041+ | 3.95 | Jerry Koosman | 221.3 | NYN |
| +042+ | 3.9 | Bob Gibson | 189 | SLN |
| +044+ | 3.79 | Bill Singer | 253 | ANA |
| +046+ | 3.74 | Ron Bryant | 231.7 | SFN |
| +053+ | 3.51 | Jim Colborn | 261.3 | MIL |
| +054+ | 3.47 | Ross Grimsley | 210.7 | CIN |
| +055+ | 3.43 | Bob Reynolds | 90.7 | BAL |
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