Harman held the 54-hole lead at the 2017 U.S. Open played at Erin Hills in Erin, Wisconsin. He entered the final round one stroke clear of three players, at 12 under par, and was the first time he had played in the final group of a major during the final round. He finished in a tie for second place with Hideki Matsuyama, four strokes behind winner Brooks Koepka, following a final round 72.