United States National Championships - Boston - April 10-12 1921
Semifinals
| 1921-04-12 | 49kg | Willie O'Connell | Al Pettingill | PTS |
| 1921-04-12 | 49kg | John Hamm | Marty Summers | PTS |
| 1921-04-12 | 52kg | George Daly | Chick Weasey | TKOI 1 |
| 1921-04-12 | 52kg | Pascal Colletti | Terry McManus | PTS |
| 1921-04-12 | 56,7kg | Ray Rodgers | Eddie Phillips | PTS |
| 1921-04-12 | 56,7kg | Dan Gartin | Jack Stark | PTS |
| 1921-04-12 | 61,2kg | Ben Ponteau | Vic Cragg | PTS |
| 1921-04-12 | 61,2kg | Ed Crozier | Walter Newton | PTS |
| 1921-04-12 | 65,8kg | Henry Bohlin | Milton Weiss | PTS |
| 1921-04-12 | 65,8kg | Charles Jenkissen | Arthur Rooney | PTS |
| 1921-04-12 | 71,7kg | Sam Lagonia | Jack Rowe | PTS |
| 1921-04-12 | 71,7kg | Bernard Feeney | Joseph Ferry | PTS |
| 1921-04-12 | 79,4kg | Reggo Miane | Dan Rooney | PTS |
| 1921-04-12 | 79,4kg | Magnus Larsen | Ernest Perrin | TKO 1 |
| 1921-04-12 | +79,4kg | Gordon Munce | Bob Tucker | TKO 2 |
Finals
| 1921-04-12 | 49kg | John Hamm | Willie O'Connell | PTS |
| 1921-04-12 | 52kg | George Daly | Pascal Colletti | PTS |
| 1921-04-12 | 56,7kg | Dan Gartin | Ray Rodgers | TKO 3 |
| 1921-04-12 | 61,2kg | Ben Ponteau | Ed Crozier | PTS |
| 1921-04-12 | 65,8kg | Charles Jenkissen | Henry Bohlin | TKO 2 |
| 1921-04-12 | 71,7kg | Sam Lagonia | Bernard Feeney | PTS |
| 1921-04-12 | 79,4kg | Magnus Larsen | Reggo Miane | WO. |
| 1921-04-12 | +79,4kg | Gordon Munce | James Flavin | TKO 2 |