Jon Jones, UFC’s greatest ever fighter, announces retirement from MMA

• Jon Jones announces retirement from UFC at age 37

• Aspinall elevated to undisputed heavyweight champ

• Jones retires with 28-1 record, 16-0 in UFC title fights

Jon Jones, a legend in mixed martial arts, has retired and interim heavyweight champion Tom Aspinall has been elevated to the undisputed title holder, UFC president and CEO Dana White said Saturday.

Jon Jones called us last night and retired," White said during a press conference in Azerbaijan, where UFC Fight Night was held. Jon Jones is officially retired. Tom Aspinall is the heavyweight champion of the UFC."