Oosthuizen, who moved into the lead with the fourth double- eagle in the event’s 76-year history, was tied when Kuchar made an eagle at the par-5 15th hole at Augusta National Golf Club in Augusta, Georgia.
Bubba Watson is 8-under par, one shot better than Lee Westwood and three-time champion Phil Mickelson, who has five holes remaining. Mickelson has made two birdies since a triple- bogey on the par-3 sixth hole.
Oosthuizen, the 2010 British Open champion, took the lead two holes into the final round when his second shot on the par-5 hole landed on the green and rolled into the cup. It was the first double-eagle on the second hole in Masters history and took Oosthuizen to 10-under par for the tournament.
Jeff Maggert had the last Masters double-eagle, in 1994 on the 13th hole. Bruce Devlin had one on the eighth hole in 1967 and Gene Sarazen was the first to do it, making a two on the par-5 15th hole in winning the 1935 Masters.
Four-time Masters champion Tiger Woods finished at 5-over par for the tournament after a 2-over 74 today.
Bo Van Pelt shot a tournament-best 8-under-par 64 today, matching the Masters record for the lowest final-round score. Van Pelt had two eagles over the final nine holes, including a hole-in-one on the par-3 16th hole. He finished the tournament at 1-under par.
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