100.United States National Championships - Colorado Springs - February 26 - March 3 1990
Quarterfinals
| 1990-02-28 | 48kg | Bradley Martinez | Mark Burse | 5:0 |
| 1990-02-28 | 48kg | Jeffrey Chavez | David Sellers | RSC 1 |
| 1990-02-28 | 48kg | Orlando Malone | Russell Roberts | 4:1 |
| 1990-02-28 | 48kg | John Herrera | James Davis | 5:0 |
| 1990-02-28 | 51kg | Rudolph Bradley | Tim Austin | 4:1 |
| 1990-02-28 | 51kg | Ronald Dunlap | Sean Goliday | 4:1 |
| 1990-02-28 | 51kg | Marcel Brown | Anthony Burton | 3:2 |
| 1990-02-28 | 51kg | Juan Delgado | Andrew Ireland | 5:0 |
| 1990-02-28 | 54kg | Sergio Reyes | Sean Fletcher | 5:0 |
| 1990-02-28 | 54kg | Guillermo Jorrin | Aristead Clayton | 3:2 |
| 1990-02-28 | 54kg | Adrian Mitchell | Drahcir Parson | RSC 2 |
| 1990-02-28 | 54kg | Lionel Odom | Chris Gomez | 3:2 |
| 1990-02-28 | 57kg | Oscar de la Hoya | Julian Wheeler | 5:0 |
| 1990-02-28 | 57kg | Sandtanner Lewis | Kenneth Friday | 3:2 |
| 1990-02-28 | 57kg | Ivan Robinson | Teddy Randolph | 5:0 |
| 1990-02-28 | 57kg | Mike Rafferty | Eddie Croft | 5:0 |
| 1990-02-28 | 60kg | Patrice Brooks | Mario Navarez | RSC 2 |
| 1990-02-28 | 60kg | Daniel Lujan | Derrick Frances | 5:0 |
| 1990-02-28 | 60kg | Shane Mosley | Lamar Murphy | 5:0 |
| 1990-02-28 | 60kg | Martin Johnson | Sean Eigenberger | 5:0 |
| 1990-02-28 | 63,5kg | Terron Millett | Kenny Ellis | RSCH 2 |
| 1990-02-28 | 63,5kg | Hector Colon | Vernon Forrest | 3:2 |
| 1990-02-28 | 63,5kg | Ronald Wright | Jason Tintes | 5:0 |
| 1990-02-28 | 63,5kg | Steve Johnston | Narciso Aleman | 5:0 |
| 1990-02-28 | 67kg | Dailyn Hutchinson | Ron Walstrans | 5:0 |
| 1990-02-28 | 67kg | Curtis Byrd | Jim Byrd | RSC 1 |
| 1990-02-28 | 67kg | Emmett Linton | Jaime Lerma | 4:1 |
| 1990-02-28 | 67kg | Patrick Byrd | Curtis Peoples | 5:0 |
| 1990-02-28 | 71kg | Mario Munoz | Robert Allen | AB 2 |
| 1990-02-28 | 71kg | Paul Vaden | DeWayne Downs | 4:1 |
| 1990-02-28 | 71kg | Mark Lanton | Roderick Knox | 3:2 |
| 1990-02-28 | 71kg | Chris Byrd | Alfredo Layton | 5:0 |
| 1990-02-28 | 75kg | Michael DeMoss | Jerry Lee Williams | 5:0 |
| 1990-02-28 | 75kg | Frank Vassar | Robert Meek | 5:0 |
| 1990-02-28 | 75kg | Ronald Simms | Melvin Doug Moore | RSC 1 |
| 1990-02-28 | 75kg | Robert Fisher | Derrick James | 5:0 |
| 1990-02-28 | 81kg | Cecil Pannell | Harold Brooks | 4:1 |
| 1990-02-28 | 81kg | Terry McGroom | Denard Trapp | 5:0 |
| 1990-02-28 | 81kg | Jeremy Williams | Richard Bonds | 5:0 |
| 1990-02-28 | 81kg | Kenny Keene | Mark Carlson | 5:0 |
| 1990-02-28 | 91kg | Randal Crippen | Obed Sullivan | AB 2 |
| 1990-02-28 | 91kg | Gary Butler | Stanley Allen | 4:1 |
| 1990-02-28 | 91kg | James Johnson | Ronald DeBerry | RSC 2 |
| 1990-02-28 | 91kg | Javier Alvarez | Raymond Carger | 5:0 |
| 1990-02-28 | +91kg | Edward Escobedo | Kalolo Kelemete | RSC 1 |
| 1990-02-28 | +91kg | Gregory Richardson | Gary Garner | RSC 3 |
| 1990-02-28 | +91kg | Alex Johnson | Archie Perry | 4:1 |
| 1990-02-28 | +91kg | Isaac Brown | Anthony Wade | 4:1 |
Semifinals
| 1990-03-01 | 48kg | John Herrera | Orlando Malone | RSC 3 |
| 1990-03-01 | 48kg | Bradley Martinez | Jeffrey Chavez | 5:0 |
| 1990-03-01 | 51kg | Ronald Dunlap | Marcel Brown | 3:2 |
| 1990-03-01 | 51kg | Rudolph Bradley | Juan Delgado | DQ |
| 1990-03-01 | 54kg | Sergio Reyes | Guillermo Jorrin | 5:0 |
| 1990-03-01 | 54kg | Lionel Odom | Adrian Mitchell | 5:0 |
| 1990-03-01 | 57kg | Ivan Robinson | Mike Rafferty | 5:0 |
| 1990-03-01 | 57kg | Oscar de la Hoya | Sandtanner Lewis | AB 1 |
| 1990-03-01 | 60kg | Shane Mosley | Daniel Lujan | 5:0 |
| 1990-03-01 | 60kg | Patrice Brooks | Martin Johnson | 5:0 |
| 1990-03-01 | 63,5kg | Steve Johnston | Ronald Wright | 4:1 |
| 1990-03-01 | 63,5kg | Terron Millett | Hector Colon | 3:2 |
| 1990-03-01 | 67kg | Patrick Byrd | Dailyn Hutchinson | 3:2 |
| 1990-03-01 | 67kg | Emmett Linton | Curtis Byrd | 4:1 |
| 1990-03-01 | 71kg | Paul Vaden | Mark Lanton | 4:1 |
| 1990-03-01 | 71kg | Chris Byrd | Mario Munoz | 5:0 |
| 1990-03-01 | 75kg | Ronald Simms | Robert Fisher | 5:0 |
| 1990-03-01 | 75kg | Michael DeMoss | Frank Vassar | 5:0 |
| 1990-03-01 | 81kg | Terry McGroom | Kenny Keene | 5:0 |
| 1990-03-01 | 81kg | Jeremy Williams | Cecil Pannell | AB 2 |
| 1990-03-01 | 91kg | James Johnson | Gary Butler | 5:0 |
| 1990-03-01 | 91kg | Javier Alvarez | Randal Crippen | 3:2 |
| 1990-03-01 | +91kg | Gregory Richardson | Isaac Brown | AB 2 |
| 1990-03-01 | +91kg | Edward Escobedo | Alex Johnson | RSC 3 |
Finals
| 1990-03-03 | 48kg | John Herrera | Bradley Martinez | 5:0 |
| 1990-03-03 | 51kg | Rudolph Bradley | Ronald Dunlap | 5:0 |
| 1990-03-03 | 54kg | Sergio Reyes | Lionel Odom | 4:1 |
| 1990-03-03 | 57kg | Oscar de la Hoya | Ivan Robinson | 4:1 |
| 1990-03-03 | 60kg | Shane Mosley | Patrice Brooks | 5:0 |
| 1990-03-03 | 63,5kg | Steve Johnston | Terron Millett | 4:1 |
| 1990-03-03 | 67kg | Emmett Linton | Patrick Byrd | 3:2 |
| 1990-03-03 | 71kg | Paul Vaden | Chris Byrd | 3:2 |
| 1990-03-03 | 75kg | Michael DeMoss | Ronald Simms | 5:0 |
| 1990-03-03 | 81kg | Jeremy Williams | Terry McGroom | WO. |
| 1990-03-03 | 91kg | Javier Alvarez | James Johnson | 4:1 |
| 1990-03-03 | +91kg | Edward Escobedo | Gregory Richardson | RSC 1 |