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 "Championship belt"): A championship belt is 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, much like a cup or trophy in other sports.
Relevant evidence: Yes