| 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 |
| Tom Seaver | NYN | 6.36 | 197304270_NYN_ATL |
| Jim Palmer | BAL | 5.56 | 197304280_BAL_OAK |
| 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 |
| Steve Arlin | SDN | -2.09 | 197304290_SDN_CHN |
Based on accumulated WAA for this season up to 1973-04-29.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 2.8 | Wilbur Wood | 55.3 | CHA |
| +002+ | 2.25 | Tom Seaver | 40.3 | NYN |
| +004+ | 1.94 | Jerry Koosman | 34 | NYN |
| +006+ | 1.84 | Dave McNally | 48.3 | BAL |
| +007+ | 1.8 | Ron Bryant | 41 | SFN |
| +008+ | 1.72 | Ken Holtzman | 43.7 | OAK |
| +009+ | 1.71 | Don Gullett | 47.3 | CIN |
| +011+ | 1.55 | Jim Barr | 35.3 | SFN |
| +012+ | 1.51 | Joe Coleman | 47.7 | DET |
| +018+ | 1.37 | Jerry Reuss | 39 | HOU |
| +019+ | 1.35 | Bill Greif | 21 | SDN |
| +020+ | 1.34 | Don Sutton | 42 | LAN |
| +023+ | 1.33 | Steve Carlton | 51 | PHI |
| +025+ | 1.31 | Gaylord Perry | 51 | CLE |
| +026+ | 1.29 | Rick Reuschel | 29 | CHN |
| XXXXX | 1.2 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.18 | Jim Slaton | 27.3 | MIL |
| XXXXX | 1.17 | Bill Singer | 32.7 | ANA |
| XXXXX | 1.02 | Jim Perry | 33.7 | DET |
| XXXXX | 0.99 | Harry Parker | 14.7 | NYN |
| XXXXX | 0.92 | Ray Burris | 11.3 | CHN |
| XXXXX | 0.91 | Jack Billingham | 45.3 | CIN |
| XXXXX | 0.89 | Rudy May | 24 | ANA |
| XXXXX | 0.85 | Ross Grimsley | 39.3 | CIN |
| XXXXX | 0.83 | Rollie Fingers | 18.7 | OAK |
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