| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 15.1 | 197306050_CHA_BAL |
| Tom Seaver | NYN | 7.55 | 197306030_NYN_SDN |
| Gaylord Perry | CLE | 5.7 | 197306030_CLE_KCA |
| Ken Holtzman | OAK | 2.9 | 197306040_MIL_OAK |
| Dave McNally | BAL | 2.9 | 197306030_BAL_TEX |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Pete Broberg | TEX | -2.24 | 197306030_BAL_TEX |
| Ron Reed | ATL | -1.75 | 197306030_ATL_CHN |
| Rich Hand | ANA | -1.7 | 197306050_DET_ANA |
| Jerry Reuss | HOU | -1.64 | 197306050_PHI_HOU |
| Steve Busby | KCA | -1.37 | 197306030_CLE_KCA |
Based on accumulated WAA for this season up to 1973-06-05.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.3 | Ken Holtzman | 117 | OAK |
| +003+ | 4.16 | Tom Seaver | 98.3 | NYN |
| +004+ | 3.92 | Wilbur Wood | 144.3 | CHA |
| +007+ | 3.42 | Bill Singer | 105 | ANA |
| +008+ | 3.42 | Rick Reuschel | 81.3 | CHN |
| +011+ | 3.07 | Ron Bryant | 99.3 | SFN |
| +010+ | 3.07 | Jim Colborn | 91.3 | MIL |
| +012+ | 2.92 | Don Sutton | 99 | LAN |
| +013+ | 2.92 | Bill Lee | 83.7 | BOS |
| +016+ | 2.69 | Bill Greif | 82.7 | SDN |
| +017+ | 2.63 | Jim Perry | 85.3 | DET |
| +018+ | 2.62 | Jim Palmer | 87 | BAL |
| +020+ | 2.54 | Gaylord Perry | 119.7 | CLE |
| +022+ | 2.46 | Paul Splittorff | 101.3 | KCA |
| +023+ | 2.46 | Nolan Ryan | 106 | ANA |
| +027+ | 2.25 | Wayne Twitchell | 66.7 | PHI |
| +028+ | 2.24 | Dave McNally | 90 | BAL |
| +031+ | 2.11 | Joe Coleman | 99.3 | DET |
| +033+ | 2.03 | Ross Grimsley | 87 | CIN |
| +034+ | 2.02 | Alan Foster | 54 | SLN |
| +035+ | 2.01 | Bert Blyleven | 100.3 | MIN |
| +042+ | 1.79 | Dave Roberts | 80 | HOU |
| +045+ | 1.73 | Jack Billingham | 101 | CIN |
| +049+ | 1.64 | Jerry Koosman | 85.7 | NYN |
| +051+ | 1.56 | Rollie Fingers | 39 | OAK |
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