Question: Kelly Robert Pavlik (born April 5, 1982) is an American former professional boxer who competed from 2000 to 2012, he made three successful title defenses before losing them to which Argentine former professional boxer, who competed from 1997 to 2014?
{'answer': 'Sergio Gabriel Martínez', 'supporting_facts': [['Kelly Pavlik', 1], ['Sergio Martínez (boxer)', 0]]}