| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 18.2 | 197305140_CHA_OAK |
| Mickey Lolich | DET | 2.31 | 197305160_BOS_DET |
| Don Wilson | HOU | 2.07 | 197305150_ATL_HOU |
| Bert Blyleven | MIN | 1.95 | 197305150_MIN_TEX |
| Al Downing | LAN | 1.93 | 197305160_LAN_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ken Brett | PHI | -3.44 | 197305140_PHI_SLN |
| Pete Broberg | TEX | -2.75 | 197305160_KCA_TEX |
| Bill Champion | MIL | -2.13 | 197305140_CLE_MIL |
| Mike Corkins | SDN | -2.11 | 197305140_SFN_SDN |
| Carl Morton | ATL | -1.59 | 197305140_ATL_HOU |
Based on accumulated WAA for this season up to 1973-05-16.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.18 | Ken Holtzman | 78.7 | OAK |
| +002+ | 3.94 | Wilbur Wood | 92.3 | CHA |
| +003+ | 3.37 | Tom Seaver | 65.3 | NYN |
| +004+ | 3.01 | Bill Singer | 71.7 | ANA |
| +006+ | 2.63 | Rick Reuschel | 59 | CHN |
| +010+ | 2.57 | Ron Bryant | 68.7 | SFN |
| +012+ | 2.42 | Gaylord Perry | 76 | CLE |
| +013+ | 2.28 | Bill Greif | 46 | SDN |
| +014+ | 2.22 | Jerry Reuss | 66.3 | HOU |
| +017+ | 2.07 | Joe Coleman | 68 | DET |
| +018+ | 2.07 | Jerry Koosman | 57.3 | NYN |
| +019+ | 2.06 | Rudy May | 45 | ANA |
| +023+ | 1.96 | Dave McNally | 69.7 | BAL |
| +024+ | 1.94 | Jack Billingham | 68.7 | CIN |
| +025+ | 1.89 | Paul Splittorff | 70.3 | KCA |
| +032+ | 1.74 | Jim Palmer | 51.7 | BAL |
| +033+ | 1.72 | Jim Perry | 53.7 | DET |
| +039+ | 1.51 | Bill Lee | 50 | BOS |
| +040+ | 1.45 | Nolan Ryan | 73 | ANA |
| +041+ | 1.44 | Mel Stottlemyre | 62.7 | NYA |
| +042+ | 1.43 | Don Sutton | 64 | LAN |
| +044+ | 1.34 | Doyle Alexander | 44.3 | BAL |
| +047+ | 1.25 | Bruce DalCanton | 42.7 | KCA |
| XXXXX | 1.24 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.23 | Rollie Fingers | 27.7 | OAK |
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