Rory McIlroy shot a disappointing three-over-par 75 in the third round of the Memorial Tournament in Ohio.
The Holywood player carded a double-bogey at the third to go along with three bogeys and two birdies.
McIlroy, who has struggled in recently tournaments, is joint 64th on six over, 14 shots behind leader Matt Kuchar.
World number one Tiger Wood ran up the highest nine-hole score of his professional career as he posted a 79 to finish eight over.
The world number one, who started on the 10th, leaked double bogeys on the 12th and 15th, dropped another shot on the 17th and triple-bogeyed the 18th.
He picked up three shots after the turn but made further bogeys at the sixth and ninth for a round of 79.
This was defending champion and five-time winner Woods's worst ever round at Jack Nicklaus's Muirfield Village course.
His previous highest nine-hole score was 43 - something he fired on three occasions, most recently at Quail Hollow in 2010 when he also shot a 79.
Woods's most ugly 18-hole score was an 81 he compiled in brutal conditions during the third round of the 2002 Open at Muirfield in Scotland.