Mason Troy Cox is an American-born Australian professional Australian rules footballer who plays for the Fremantle Football Club in the Australian Football League (AFL). Playing as a ruckman and key forward, he first played Australian rules football in April 2014 before making his AFL debut for Collingwood two years later in April 2016. Cox previously played basketball for Oklahoma State University in the Big 12 Conference and, standing at 211 cm, is the tallest player to ever be measured at an AFL Draft Combine.