| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 17.87 | 197306010_CHA_MIL |
| Don Sutton | LAN | 6.66 | 197306010_WAS_LAN |
| Gaylord Perry | CLE | 5.58 | 197305300_CLE_TEX |
| Dave McNally | BAL | 2.84 | 197305300_BAL_KCA |
| Mickey Lolich | DET | 2.5 | 197305300_DET_CHA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wayne Simpson | KCA | -4.13 | 197305300_BAL_KCA |
| Pete Broberg | TEX | -2.63 | 197305300_CLE_TEX |
| Mike Kekich | NYA | -1.82 | 197306010_ANA_NYA |
| Ron Reed | ATL | -1.78 | 197305300_ATL_PIT |
| Brent Strom | CLE | -1.67 | 197305310_CLE_TEX |
Based on accumulated WAA for this season up to 1973-06-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.14 | Ken Holtzman | 109.7 | OAK |
| +002+ | 4.83 | Wilbur Wood | 136.7 | CHA |
| +005+ | 3.82 | Tom Seaver | 89.3 | NYN |
| +007+ | 3.42 | Bill Singer | 105 | ANA |
| +008+ | 3.38 | Rick Reuschel | 73 | CHN |
| +011+ | 2.93 | Ron Bryant | 92.3 | SFN |
| +012+ | 2.92 | Don Sutton | 99 | LAN |
| +013+ | 2.87 | Bill Greif | 74.7 | SDN |
| +015+ | 2.61 | Jim Perry | 79.7 | DET |
| +016+ | 2.61 | Bill Lee | 74.7 | BOS |
| +020+ | 2.46 | Jim Palmer | 78 | BAL |
| +021+ | 2.42 | Jim Colborn | 82.3 | MIL |
| +022+ | 2.41 | Gaylord Perry | 113 | CLE |
| +025+ | 2.25 | Paul Splittorff | 96.3 | KCA |
| +027+ | 2.2 | Nolan Ryan | 98 | ANA |
| +029+ | 2.14 | Joe Coleman | 99.3 | DET |
| +033+ | 1.97 | Gene Garber | 50.7 | KCA |
| +034+ | 1.89 | Ross Grimsley | 80 | CIN |
| +036+ | 1.83 | Alan Foster | 46.3 | SLN |
| +038+ | 1.78 | Dave McNally | 85 | BAL |
| +043+ | 1.58 | Jack Billingham | 91.3 | CIN |
| +047+ | 1.56 | Rollie Fingers | 36.3 | OAK |
| +049+ | 1.51 | Bert Blyleven | 91.3 | MIN |
| +052+ | 1.49 | Wayne Twitchell | 57.7 | PHI |
| +058+ | 1.38 | Jerry Koosman | 77.7 | NYN |
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