Hideki Matsuyama suffered a second-round meltdown and carded his worst score on the U.S. PGA Tour at the Cadillac Championship on Friday.
Matsuyama started the day four strokes off the pace in a tie for 11th place, but made two birdies, three bogeys and four double bogeys for an 9-over-par 81 to plunge into a tie for 60th at 7-over 151.
"If you don't play solidly on a (difficult) course like this, then this is what happens," Matsuyama said.
Australian Adam Scott fired a 66 and took a two-shot lead over Northern Ireland's Rory McIlroy and American Dustin Johnson at 10-under 134.