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An ace for Bo Van Pelt on the 16th _ the second straight year he has made two eagles on the back nine _ for a tournament-best 64. An ace for Adam Scott on the same hole, sending him to a 66.

The loudest cheer was for Oosthuizen’s albatross.

Hanson was sizing up a difficult chip from right of the first green when Augusta erupted in cheers from down below. No one was sure what it meant until Hanson and Mickelson hit their tee shots on the par-5 second, glanced over at the white leaderboard behind the eighth green and saw that Oosthuizen had gone from 7 under to 10 under ahead of them.

Hanson made two quick bogeys and never caught back up. Mickelson’s tournament might have ended on the fourth hole with one swing, one bad bounce off the bleachers, and two straight right-handed shots that led to triple bogey.

“Oh, no,” Mickelson said as his tee shot struck the grandstand and caromed into the woods. He could have gone back to the tee and played his third shot. Instead, he tried to chop out of the trees from the right side and barely moved it a yard. He tried the same shot again and slapped it to a muddy patch of grass. From there he went into the bunker, and triple bogey was the best he could do.

Kuchar made a late run, but this back nine _ plus two extra holes _ ultimately belonged to Watson and Oosthuizen. And when it was over, austere Augusta National had a guy named “Bubba” in a green jacket.