| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 15.1 | 197306050_CHA_BAL |
| Don Sutton | LAN | 7.14 | 197306060_LAN_CHN |
| Ken Holtzman | OAK | 2.9 | 197306040_MIL_OAK |
| Bob Gibson | SLN | 2.61 | 197306060_SDN_SLN |
| Joe Coleman | DET | 2.1 | 197306060_DET_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Hand | ANA | -1.7 | 197306050_DET_ANA |
| Jerry Reuss | HOU | -1.64 | 197306050_PHI_HOU |
| Steve Blass | PIT | -0.85 | 197306060_SFN_PIT |
| Larry Christenson | PHI | -0.72 | 197306040_PHI_HOU |
| Joe Decker | MIN | -0.56 | 197306062_MIN_CLE |
Based on accumulated WAA for this season up to 1973-06-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.37 | Ken Holtzman | 117 | OAK |
| +004+ | 4.22 | Tom Seaver | 98.3 | NYN |
| +005+ | 4.04 | Wilbur Wood | 144.3 | CHA |
| +007+ | 3.47 | Rick Reuschel | 81.3 | CHN |
| +008+ | 3.4 | Bill Singer | 111.3 | ANA |
| +009+ | 3.39 | Bill Lee | 93.7 | BOS |
| +011+ | 3.15 | Jim Colborn | 91.3 | MIL |
| +012+ | 3.13 | Ron Bryant | 99.3 | SFN |
| +014+ | 2.76 | Bill Greif | 82.7 | SDN |
| +015+ | 2.7 | Jim Perry | 85.3 | DET |
| +017+ | 2.68 | Jim Palmer | 87 | BAL |
| +021+ | 2.52 | Paul Splittorff | 101.3 | KCA |
| +020+ | 2.52 | Nolan Ryan | 106 | ANA |
| +022+ | 2.49 | Gaylord Perry | 119.7 | CLE |
| +026+ | 2.3 | Dave McNally | 90 | BAL |
| +027+ | 2.29 | Wayne Twitchell | 66.7 | PHI |
| +031+ | 2.14 | Don Sutton | 104 | LAN |
| +032+ | 2.09 | Ross Grimsley | 87 | CIN |
| +033+ | 2.06 | Alan Foster | 54 | SLN |
| +034+ | 1.95 | Bert Blyleven | 100.3 | MIN |
| +040+ | 1.82 | Dave Roberts | 80 | HOU |
| +042+ | 1.8 | Jack Billingham | 101 | CIN |
| +047+ | 1.69 | Jerry Koosman | 85.7 | NYN |
| +051+ | 1.58 | Rollie Fingers | 39 | OAK |
| +053+ | 1.56 | Gene Garber | 53 | KCA |
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