sentences:  Ultimately, "The Ghost" lost by unanimous decision but Guerrero's determination and strong will to win had the crowd of the MGM Grand chanting his name for the majority of the final round.On June 6, 2015 Guerrero fought again on NBC as part of the "Premier Boxing Champions" series at StubHub Center, California, against the gritty Aron Martinez (19-4-1, 4 KOs).Martinez proved himself to be an underdog with bite.