Claressa Shields calls for women to box three-minute rounds, as she eyes move to MMA WEBSITES IN the four belt era, boxing has been plagued by undeserving mandatory challengers and bizarre rankings for years. A consequence of this has been a splintering of world championships in each division, making it increasingly hard to point to a single fighter in a weight class and say, “They’re number one.” The truly definitive way of determining this is by crowning an undisputed champion; a fighter who holds all four major belts in their division. 2021 could be defined by such feats. Last week, ...