Demian Maia (born 6 November 1977) is a Brazilian professional submission grappler and mixed martial artist. He competed in both the Welterweight and Middleweight divisions of the Ultimate Fighting Championship (UFC). Maia is regarded as one of the greatest grapplers in MMA history. He has competed in two UFC title fights, losing against Anderson Silva for the UFC Middleweight Championship in 2010 and Tyron Woodley for the UFC Welterweight Championship in 2017.