Robert Joseph Guerrero is an American professional boxer. Nicknamed The Ghost, he is the current interim WBC welterweight champion. He is also a former IBF Super Featherweight world champion, a former interim WBA and WBO lightweight champion and a former two-time IBF featherweight champion. He vacated the IBF Super Featherweight belt due to his wife's battle with leukemia. Guerrero's coach is Ruben Guerrero.