Mikaela Mayer (22-2, 5 KOs) defeated Mary Spencer (10-3, 6 KOs) on Thursday night in Montreal, Canada and became three-division world champion. Mayer won clear via unanimous decision (100-90, 98:92, 98:92) and became unified champion in super-welterweight division winning WBA, WBC and WBO World titles. Mayer was world champion also in welterweight division and super-featherweight […]