What is the name of the American mixed martial artist competing in the UFC, born in 1984, and winning the Middleweight Championship against Chris Weidman?
Chris Weidman:  Chris Weidman successfully defended the belt three times before losing it to Luke Rockhold. Luke Rockhold: Luke Skyler Rockhold (born October 17, 1984) is an American mixed martial artist competing in the UFC, where he is the former UFC Middleweight Champion.
i don't know