Sep 13, 2014; Las Vegas, NV, USA; Boxing referee Kenny Bayless separates Floyd Mayweather (green gloves) after he was bitten on the hand by Marcos Maidana (blue gloves) during their WBC & WBA Welterweight and WBC Superwelter Weight title fight at the MGM Grand Garden Arena. Mandatory Credit: Jayne Kamin-Oncea-USA TODAY Sports