SHANGHAI - Masters winner Bubba Watson roared back to beat Tim Clark in a playoff Sunday after seemingly blowing his chances down the back nine of the WGC-HSBC Champions. Watson punched the air after holing an outrageous 20-yard bunker shot for eagle at the 18th to get into a playoff with South Africa's Clark at 11-under. The left-hander then rolled in a lightning quick 25-foot putt down a slope on the same hole for the winning birdie, sparking wild celebrations for his first World Golf Championships event win. Leading at 12-under par with three holes to play, Watson had seemingly imploded with a bogey followed by a double-bogey at the 16th and 17th to fall to nine under. At that point five players were a shot ahead of him, until his magic from the sand saw him finish 11-under.