Final Round from British Open at St. Andrews

1 of 20 Fred Vuich/SI

won his first major championship Sunday, shooting a 1-under 71 to win by seven shots at St. Andrews.

2 of 20 Richard Heathcote/Getty Images

switched back to his Scotty Cameron putter for his final round. But he made two front-nine double-bogeys while continuing to struggle on St. Andrews' greens.

3 of 20 Warren Little/Getty Images

continued his poor play at the British Open, finishing tied for 48th.

4 of 20 Fred Vuich/SI

made one birdie and 17 pars to tie for third.

5 of 20 Robert Beck/SI

was poised for a second-place finish, but he bogeyed the last three holes to tie for seventh.

6 of 20 Harry How/Getty Images

rebounded from an 80 on Friday to tie for third.

7 of 20 Robert Beck/SI

Nick Watney, center, and Sean O'Hair, not pictured, were the low Americans at St. Andrews. They tied for seventh.

8 of 20 Ross Kinnaird/Getty Images

made the cut on the number and shot 71-67 on the weekend to tie for 14th.

9 of 20 Stuart Franklin/Getty Images

shot a Sunday 73 to finish one over for the tournament.

10 of 20 Harry How/Getty Images

fought through a leg injury this week to finish second. He also finished second at the Masters.

11 of 20 Ross Kinnaird/Getty Images

Oosthuizen stopped by the Jigger Inn, near the Old Course, for a little celebration.

12 of 20 Angus Murray

Oosthuizen and Paul Casey were paired in the final group. Oosthuizen led Casey by four strokes at the start of the day.

13 of 20 Fred Vuich/SI

Oosthuizen made a bogey on No. 8, but he followed his mistake with an eagle on the par-4 ninth.

14 of 20 Robert Beck/SI

was unable to put pressure on Oosthuizen Sunday. Casey tied for third. "Nobody was going to stop him," said Casey. "He didn't miss a shot today. I don't know if he missed one all week. That was four days of tremendous golf. He didn't flinch today."

15 of 20 Fred Vuich/SI

Casey's hopes for a first major title were dashed when he drove into a gorse bush on No. 12 and walked off with a triple bogey.

16 of 20 Fred Vuich/SI

"That eagle on nine, that got me started," Oosthuizen said. "It was a big change on 12 when Paul made triple and I made birdie. All of a sudden, it was mine to throw away."