Diamond Belt Tournament - Seattle, USA - August 1-4 1957
results incomplete
US elimination bouts
| 1957-08-01 | 51kg | Clyde Williams | USA | Tony Adams | USA | PTS |
| 1957-08-01 | 51kg | Don Adamson | USA | Clyde Williams | USA | PTS |
| 1957-08-01 | 57kg | Quincey Daniels | USA | Rubin Pizarro | USA | PTS |
| 1957-08-01 | 60kg | Don Johnson | USA | John Howell | USA | PTS |
| 1957-08-01 | 63,5kg | Jerry Wright | USA | Bob Beglau | USA | TKO 2 |
| 1957-08-01 | 67kg | Don Hullinger | USA | Bill Maddox | USA | PTS |
| 1957-08-01 | 67kg | Fred Ward | USA | Herb Leseur | USA | TKO 3 |
| 1957-08-01 | 71kg | Terry Smith | USA | Dean Harrison | USA | TKO 2 |
| 1957-08-01 | 75kg | Alex Ford | USA | Rufus Mitchell | USA | TKO 2 |
| 1957-08-01 | 81kg | Phil Johnson | USA | Frank Farr | USA | TKO 1 |
| 1957-08-01 | 81kg | Jim Robertson | USA | Gil Dowling | USA | PTS |
| 1957-08-01 | +81kg | John Stewart | USA | Charles Johnson | USA | PTS |
| 1957-08-02 | 60kg | Frank Talaga | USA | Don Johnson | USA | PTS |
| 1957-08-02 | 67kg | Don Hullinger | USA | Fred Ward | USA | PTS |
| 1957-08-02 | 75kg | Alex Ford | USA | Wilbur Young | USA | PTS |
| 1957-08-02 | 81kg | Willie Richardson | USA | Jim Robertson | USA | PTS |
Quarter-finals
| 1957-08-02 | 51kg | Ray Perez | USA | Carlos Gomez | MEX | PTS |
| 1957-08-02 | 57kg | Douglas Vaillant | CUB | Quincey Daniels | USA | PTS |
| 1957-08-02 | 57kg | Koei Okada | JPN | Floyd Patium | USA | PTS |
| 1957-08-02 | 60kg | Jorge Garcia | MEX | Henry Wong | CHN | PTS |
| 1957-08-02 | 63,5kg | Al Smith | USA | Hsing Chen Liao | CHN | PTS |
| 1957-08-02 | 63,5kg | Jerry Wright | USA | Osamu Seiyama | JPN | PTS |
| 1957-08-02 | 67kg | Jose Gomez | MEX | Chi Yu Lew | CHN | PTS |
| 1957-08-02 | 67kg | Paul Fujii | USA | Al Noel | CAN | PTS |
| 1957-08-02 | 67kg | Don Hullinger | USA | Osumo Takahashi | JPN | PTS |
| 1957-08-02 | 75kg | Alex Ford | USA | Lo Pu Chang | CHN | TKO 3 |
Semifinals
| 1957-08-03 | 51kg | Jose Rigores | CUB | Don Adamson | USA | PTS |
| 1957-08-03 | 51kg | Ray Perez | USA | So Hu Yuam | CHN | PTS |
| 1957-08-03 | 54kg | John Cereghin | USA | Ultiminio Ramos | CUB | DQ 3 |
| 1957-08-03 | 54kg | Heiji Shimabukuro | USA | Sergio Mendegahal | MEX | PTS |
| 1957-08-03 | 57kg | Roberto Cornejo | MEX | Chen Sung Rung | CHN | PTS |
| 1957-08-03 | 57kg | Douglas Vaillant | CUB | Koei Okada | JPN | PTS |
| 1957-08-03 | 60kg | Frank Talaga | USA | Tommie Chessen | CAN | PTS |
| 1957-08-03 | 60kg | Jorge Garcia | MEX | Luis Molina | USA | PTS |
| 1957-08-03 | 63,5kg | Antonio Zaldivar | CUB | Les Mason | CAN | TKO 2 |
| 1957-08-03 | 63,5kg | Jerry Wright | USA | Al Smith | USA | PTS |
| 1957-08-03 | 67kg | Jose Gomez | MEX | Don Hullinger | USA | PTS |
| 1957-08-03 | 67kg | Servilio Fuentes | CUB | Paul Fujii | USA | PTS |
| 1957-08-03 | 81kg | Willie Richardson | USA | Oliver Henry | USA | PTS |
| 1957-08-02 | +81kg | John Stewart | USA | Percy Price | USA | KO 1 |
Finals
| 1957-08-03 | 51kg | Ray Perez | USA | Jose Rigores | CUB | PTS |
| 1957-08-03 | 54kg | Heiji Shimabukuro | USA | John Cereghin | USA | TKO 1 |
| 1957-08-03 | 57kg | Douglas Vaillant | CUB | Roberto Cornejo | MEX | PTS |
| 1957-08-04 | 60kg | Jorge Garcia | MEX | Frank Talaga | USA | PTS |
| 1957-08-04 | 63,5kg | Antonio Zaldivar | CUB | Jerry Wright | USA | TKO 2 |
| 1957-08-04 | 67kg | Servilio Fuentes | CUB | Jose Gomez | MEX | PTS |
| 1957-08-04 | 71kg | Terry Smith | USA | Ralph Harris | USA | PTS |
| 1957-08-04 | 75kg | Tony Pascua | USA | Alex Ford | USA | PTS |
| 1957-08-04 | 81kg | Willie Richardson | USA | Lindy Lindimoser | CAN | PTS |
| 1957-08-04 | +81kg | John Stewart | USA | Mike Mercredi | CAN | KO 2 |
Hawaiian boxers participated as a separate team (51kg - Ray Perez, 54kg - Heiji Shimabukuro, 57kg - Floyd Patium, 60kg - Luis Molina, 63,5kg - Al Smith, 67kg - Paul Fujii, 71kg - Ralph Harris, 75kg - Tony Pascua, 81kg - Oliver Henry, +81kg - Percy Price)