The two-time major champion, who has already wrapped up the European and PGA Tour money titles, struggled early when he bogeyed the first hole and missed several makeable birdie putts. But he stepped up his game on the back nine, carding three birdies and an eagle for a 6-under 66 that put him 17 under for the tournament.
Donald, tied for the lead with McIlroy and Marc Warren after the second round, sank several clutch putts on his way to a 66.








