| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 15.57 | 197305201_MIN_CHA |
| Jim Palmer | BAL | 9.02 | 197305210_BOS_BAL |
| Gaylord Perry | CLE | 5.84 | 197305210_NYA_CLE |
| Bob Gibson | SLN | 2.38 | 197305201_SLN_WAS |
| Joe Coleman | DET | 2.26 | 197305190_DET_MIL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ken Brett | PHI | -2.62 | 197305191_CHN_PHI |
| Reggie Cleveland | SLN | -2.24 | 197305202_SLN_WAS |
| Johnny Odom | OAK | -1.62 | 197305200_KCA_OAK |
| Mike Corkins | SDN | -1.49 | 197305190_SDN_CIN |
| Mike Kekich | NYA | -1.48 | 197305202_NYA_CLE |
Based on accumulated WAA for this season up to 1973-05-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.28 | Ken Holtzman | 87.7 | OAK |
| +002+ | 4.04 | Wilbur Wood | 109 | CHA |
| +003+ | 3.53 | Bill Singer | 80.7 | ANA |
| +004+ | 3.45 | Tom Seaver | 74.3 | NYN |
| +009+ | 2.63 | Rick Reuschel | 59 | CHN |
| +011+ | 2.4 | Joe Coleman | 77 | DET |
| +013+ | 2.31 | Jim Perry | 68.3 | DET |
| +015+ | 2.23 | Paul Splittorff | 79.3 | KCA |
| +016+ | 2.22 | Ron Bryant | 74.3 | SFN |
| +018+ | 2.1 | Jim Palmer | 69 | BAL |
| +020+ | 2.03 | Jack Billingham | 77.7 | CIN |
| +021+ | 2.03 | Jerry Koosman | 57.3 | NYN |
| +023+ | 1.96 | Nolan Ryan | 82 | ANA |
| +025+ | 1.95 | Dave McNally | 69.7 | BAL |
| +028+ | 1.86 | Doyle Alexander | 53.3 | BAL |
| +029+ | 1.81 | Gaylord Perry | 91.7 | CLE |
| +033+ | 1.72 | Bill Greif | 51.7 | SDN |
| +035+ | 1.7 | Rudy May | 51 | ANA |
| +037+ | 1.67 | Don Sutton | 72 | LAN |
| +038+ | 1.65 | Jerry Reuss | 72.3 | HOU |
| +042+ | 1.58 | Bill Lee | 58 | BOS |
| +044+ | 1.54 | Ross Grimsley | 66.7 | CIN |
| +051+ | 1.34 | Rollie Fingers | 29 | OAK |
| +055+ | 1.28 | Dave Roberts | 57.3 | HOU |
| XXXXX | 1.25 | Jim Colborn | 56.3 | MIL |
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