Reigning U.S. Open champion Jordan Spieth was unable to get on track in the final round, shooting a five-over 75 on Sunday at Oakmont Country Club.
Spieth finished 72 holes with a score of nine-over par 289, which tied him for 38th at the time.
Brooks Koepka, meanwhile, had one of the best rounds of the day, a two-under par 68, though in one eight-hole stretch he was eight under par.
Shane Lowry, the 54-hole leader, dropped three strokes to give Dustin Johnson the lead by one. Johnson is two under through his first nine holes.
Sergio Garcia and Scott Piercy are currently tied for third at two under. 2003 U.S. Open champion Jim Furyk, meanwhile, shot four-under 66 for the round, moving up to a tie for fifth at one under.
World No. 1 Jason Day was unable to mount a charge, shooting one over on the front nine. U.S. Open rookie Andrew Landry, playing in the final group with Lowry, is seven over through nine holes to fall from contention.