MEXICO CITY – Kelvin Gastelum is “100 percent sure” that middleweight will be the only division he competes in for the remainder of his UFC career. After winning Season 17 of “The Ultimate Fighter” reality series at 185 pounds, Gastelum (18-9 MMA, 13-9 UFC) went down to welterweight. Issues around his weight cut ultimately forced him back up a weight class and led to a window of his most success
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