| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 16.5 | 197304290_CHA_BOS |
| Gaylord Perry | CLE | 8.06 | 197304280_CLE_ANA |
| Don Sutton | LAN | 7.79 | 197304280_LAN_PIT |
| Jim Palmer | BAL | 5.56 | 197304280_BAL_OAK |
| Mickey Lolich | DET | 4.88 | 197304280_KCA_DET |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Reggie Cleveland | SLN | -5.3 | 197304280_SFN_SLN |
| Ron Reed | ATL | -4.86 | 197304280_NYN_ATL |
| Wayne Simpson | KCA | -4.76 | 197304290_KCA_DET |
| Steve Renko | WAS | -3.05 | 197304280_WAS_HOU |
| Jerry Reuss | HOU | -2.52 | 197305010_HOU_PHI |
Based on accumulated WAA for this season up to 1973-05-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.87 | Wilbur Wood | 55.3 | CHA |
| +003+ | 2.3 | Tom Seaver | 40.3 | NYN |
| +004+ | 2.13 | Jerry Reuss | 48 | HOU |
| +005+ | 1.98 | Jerry Koosman | 34 | NYN |
| +006+ | 1.93 | Dave McNally | 48.3 | BAL |
| +007+ | 1.91 | Ron Bryant | 47 | SFN |
| +009+ | 1.8 | Ken Holtzman | 43.7 | OAK |
| +010+ | 1.77 | Don Gullett | 47.3 | CIN |
| +011+ | 1.74 | Bill Singer | 41.7 | ANA |
| +014+ | 1.6 | Jim Barr | 35.3 | SFN |
| +016+ | 1.57 | Joe Coleman | 47.7 | DET |
| +021+ | 1.43 | Steve Carlton | 59 | PHI |
| +022+ | 1.4 | Don Sutton | 42 | LAN |
| +023+ | 1.38 | Gaylord Perry | 51 | CLE |
| +024+ | 1.37 | Bill Greif | 21 | SDN |
| +026+ | 1.33 | Rick Reuschel | 29 | CHN |
| XXXXX | 1.22 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.21 | Jim Slaton | 27.3 | MIL |
| XXXXX | 1.07 | Jim Colborn | 25.7 | MIL |
| XXXXX | 1.06 | Jim Perry | 33.7 | DET |
| XXXXX | 1.01 | Harry Parker | 14.7 | NYN |
| XXXXX | 0.97 | Jack Billingham | 45.3 | CIN |
| XXXXX | 0.93 | Ray Burris | 11.3 | CHN |
| XXXXX | 0.92 | Rudy May | 24 | ANA |
| XXXXX | 0.9 | Ross Grimsley | 39.3 | CIN |
_