Rory McIlroy tumbled down the leaderboard after a disappointing one-over 73 in his third round at the Memorial, as Billy Horschel steamed into a commanding lead.
McIlroy was three off the lead going into today's action in Dublin, Ohio, but he failed to mount a charge in a frustrating round in which he coughed up three bogeys.
Meanwhile Horchels was on fire. He shot a seven-under 65 to blitz the field and put himself firmly in the driving seat to wrap up the tournament on Sunday. The American is 13-under-par overall.
Aaron Wise and Cameron Smith are next best on eight-under, one ahead of Daniel Berger, Francesco Molinari and Jhonattan Vegas.
Shane Lowry's even-par 72 left him on three-under.
