Question: Who was an American boxer who was dubbed the "Uncrowned Champion of the Lightweights" who was never given the chance to fight for a large, extravagantly designed belt used primarily in combat sports such as boxing, mixed martial arts, and professional wrestling to signify the champions of the promotion or company ?
Sentence (from "Ground fighting"): Ground fighting (also called ground work or ground game) is hand-to-hand combat or wrestling which takes place while the combatants are on the ground, generally involving grappling.
Relevant evidence: No