| Starter | Tm | Tier | Game |
|---|---|---|---|
| Gaylord Perry | CLE | 6.45 | 197305120_CLE_BOS |
| Jim Palmer | BAL | 6.31 | 197305110_BAL_NYA |
| Don Sutton | LAN | 6.27 | 197305120_LAN_SFN |
| Tom Seaver | NYN | 5 | 197305120_NYN_PIT |
| Bert Blyleven | MIN | 3.46 | 197305110_MIN_KCA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ron Reed | ATL | -2.65 | 197305132_SDN_ATL |
| Pete Broberg | TEX | -2.54 | 197305120_OAK_TEX |
| Rich Gossage | CHA | -2.12 | 197305130_CHA_ANA |
| Jerry Reuss | HOU | -1.85 | 197305120_CIN_HOU |
| Johnny Odom | OAK | -1.33 | 197305120_OAK_TEX |
Based on accumulated WAA for this season up to 1973-05-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.36 | Wilbur Wood | 84.3 | CHA |
| +002+ | 3.68 | Ken Holtzman | 69.7 | OAK |
| +003+ | 3.35 | Tom Seaver | 65.3 | NYN |
| +007+ | 2.62 | Bill Singer | 61.7 | ANA |
| +008+ | 2.6 | Gaylord Perry | 76 | CLE |
| +009+ | 2.42 | Rick Reuschel | 51.3 | CHN |
| +010+ | 2.38 | Ron Bryant | 61.7 | SFN |
| +014+ | 2.29 | Bill Greif | 46 | SDN |
| +016+ | 2.1 | Jerry Koosman | 50.3 | NYN |
| +017+ | 2.07 | Rudy May | 45 | ANA |
| +019+ | 2.01 | Jerry Reuss | 58.3 | HOU |
| +020+ | 1.99 | Dave McNally | 69.7 | BAL |
| +021+ | 1.98 | Jack Billingham | 68.7 | CIN |
| +026+ | 1.76 | Jim Palmer | 51.7 | BAL |
| +029+ | 1.74 | Jim Perry | 53.7 | DET |
| +033+ | 1.52 | Ross Grimsley | 55.7 | CIN |
| +036+ | 1.46 | Mel Stottlemyre | 62.7 | NYA |
| +039+ | 1.44 | Al Downing | 43.3 | LAN |
| +038+ | 1.44 | Don Sutton | 64 | LAN |
| +042+ | 1.42 | Paul Splittorff | 62 | KCA |
| +041+ | 1.42 | Bruce DalCanton | 37 | KCA |
| +044+ | 1.34 | Joe Coleman | 59 | DET |
| +046+ | 1.26 | Rogelio Moret | 14.7 | BOS |
| XXXXX | 1.24 | Rollie Fingers | 25 | OAK |
| XXXXX | 1.14 | Roger Nelson | 33.7 | CIN |
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