Undefeated boxer Floyd Mayweather Jr. of the U.S. attends a news conference at the MGM Grand Hotel and Casino in Las Vegas, Nevada, in this file picture taken May 2, 2012. Mayweather Jr. was booked into a Las Vegas jail on June 1, 2012, to serve a 90-day sentence for domestic violence against an ex-girlfriend, a term that was previously postponed so the welterweight fighter could compete in a bout. REUTERS/Las Vegas Sun/Steve Marcus/Files (UNITED STATES - Tags: SPORT BOXING)

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