Published: Oct 08, 2011 12:10 PM EDT
Updated: Oct 09, 2011 6:30 AM EDT

CHEONAN, South Korea (AP) - Rickie Fowler shot an 8-under 63 Saturday to take a four-stroke lead after the third round of the Korea Open as Rory McIlroy slipped down the field.

Fowler, the 2010 PGA Tour Rookie of the Year, started the day in a five-way tie for the lead in a group that included McIlroy and defending champion YE Yang, before moving to a 13-under 200 total for the tournament.

Yang, playing in front of his home crowd, was in second after a 67, two strokes ahead of fellow South Korean Kim Meen-whee, who had a 66.

McIlroy struggled around the course to post a 73, leaving the U.S. Open champion 10 shots off the pace.