In November 2015, McDowell won his third PGA Tour title at the OHL Classic at Mayakoba. He prevailed in a sudden death playoff over Jason Bohn and Russell Knox during a Monday finish to the tournament. He won with a birdie on the first extra hole after his five iron approach grazed the edge of the cup and left him with three-foot birdie putt. Knox then could only up and down for par, whilst Bohn missed an 18-foot birdie putt to extend the playoff. McDowell said afterwards that the win came at the end of a real grind in what was one of his worst calendar years as a professional.