Mikaela Mayer hit back at Natasha Jonas ... is convinced her strength will stun the American. But Mayer insisted: "I spar heavy guys in the gym all the time. I spar strong women too.
Mikaela Mayer's rematch with Sandy Ryan for the WBO welterweight world championship in Las Vegas will be broadcast live on Sky Sports. Mayer will defend her WBO welterweight world title in a ...
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