| Starter | Tm | Tier | Game |
|---|---|---|---|
| Don Sutton | LAN | 6.06 | 197305270_NYN_LAN |
| Gaylord Perry | CLE | 5.14 | 197305260_CLE_CHA |
| Ken Holtzman | OAK | 2.61 | 197305260_OAK_DET |
| Bob Gibson | SLN | 2.03 | 197305260_ATL_SLN |
| Mel Stottlemyre | NYA | 1.34 | 197305260_TEX_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rich Gossage | CHA | -2.18 | 197305250_CLE_CHA |
| Ron Reed | ATL | -2.1 | 197305250_ATL_SLN |
| Steve Arlin | SDN | -1.79 | 197305272_PHI_SDN |
| Reggie Cleveland | SLN | -1.49 | 197305270_ATL_SLN |
| Ken Brett | PHI | -1.43 | 197305250_PHI_SDN |
Based on accumulated WAA for this season up to 1973-05-27.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.68 | Wilbur Wood | 122.7 | CHA |
| +003+ | 4.44 | Ken Holtzman | 102.3 | OAK |
| +004+ | 3.43 | Tom Seaver | 80.3 | NYN |
| +007+ | 3.19 | Jim Perry | 79.3 | DET |
| +008+ | 3.18 | Bill Singer | 87.7 | ANA |
| +010+ | 2.83 | Rick Reuschel | 64 | CHN |
| +011+ | 2.6 | Don Sutton | 90 | LAN |
| +017+ | 2.39 | Ron Bryant | 83.3 | SFN |
| +020+ | 2.29 | Jim Colborn | 73.3 | MIL |
| +021+ | 2.26 | Gaylord Perry | 104.7 | CLE |
| +022+ | 2.24 | Joe Coleman | 85.7 | DET |
| +024+ | 2.17 | Bill Lee | 67 | BOS |
| +023+ | 2.17 | Jim Palmer | 69 | BAL |
| +025+ | 2.16 | Jack Billingham | 86.3 | CIN |
| +027+ | 2.13 | Paul Splittorff | 87.3 | KCA |
| +028+ | 2.11 | Bill Greif | 65.7 | SDN |
| +030+ | 2.05 | Jerry Reuss | 81.3 | HOU |
| +031+ | 1.91 | Doyle Alexander | 53.3 | BAL |
| +032+ | 1.91 | Nolan Ryan | 90 | ANA |
| +034+ | 1.84 | Mel Stottlemyre | 82.3 | NYA |
| +040+ | 1.68 | Dave McNally | 78.3 | BAL |
| +041+ | 1.66 | Alan Foster | 39.3 | SLN |
| +042+ | 1.62 | Stan Bahnsen | 90 | CHA |
| +044+ | 1.59 | Jerry Koosman | 70.7 | NYN |
| +049+ | 1.54 | Rollie Fingers | 34 | OAK |
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