Shields defeats Marshall to become undisputed champion;  Baumgardner edges Mayer

Shields defeats Marshall to become undisputed champion; Baumgardner edges Mayer

Claressa Shields is once again the undisputed middleweight champion of the world. Shields defeated Savannah Marshall by unanimous decision, 96-94, 97-93, 97-93 at the O2 Arena in London on Saturday night to retain the WBC, IBF and WBA belts and win the WBO belt in a high-action, close fight . For Shields, it avenges her …

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