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He was originally scheduled to face Antonio "Bigfoot" Silva, but the Brazilian was pulled from that fight to face former UFC heavyweight titleholder Cain Velasquez in the co-main event.Velasquez was slated to face fellow ex-champion Frank Mir. But that fight was scrapped when Mir got tabbed to meet current champion Junior dos Santos. Mir replaces top contender Alistair Overeem, who was pulled from the card after failing a random prefight drug test. Nelson, the former International Fight League heavyweight champion, has a professional record of 16-7. Since winning The Ultimate Fighter series in 2009, Nelson has struggled to find his footing in the Octagon. He has won just two of his five most recent UFC fights. Gonzaga, a one-time UFC heavyweight contender, returned to the promotion on Jan. 14 and registered a first-round submission victory over Edinaldo Oliveira. He was released by UFC following an October 2010 loss to Brendan Schaub. Gonzaga will carry a 13-6 record into his fight with Nelson.