Thats his only real fight to date, and that guy was Tim Sylvia, the former UFC HW champ, although Mercer lost to Kimbo Slice in an exhibition bout that Mercer claimed that he and Kimbo had agreed to stick to boxing, but Kimbo took him down when Ray said "he wasn't expecting it" and submitted him. I don't know about that but the fight with Sylvia showed Ray still has a punch that if landed can KO anyone in MMA.
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