AUGUSTA, Ga. (AP) — Louis Oosthuizen grabbed the lead with a double-eagle on the second hole and was clinging to a one-shot advantage with four holes left at the Masters.Oosthuizen, the 2010 British Open champion, holed out from 253 yards with a 4-iron on No. 2 Sunday, the first time that hole has surrendered an albatross in the 76-year history of the tournament.With four holes to play, Oosthuizen was 9-under par, one in front of Bubba Watson.Lee Westwood, Matt Kuchar and Phil Mickelson were another shot back.Mickelson came into the day trailing by one but made triple bogey on No. 4 to fall four off the lead. He hung in there and barely missed an eagle putt on No. 13 that would have given him a share of the lead.