Vijay Singh carded a five-under-par 67 to move into a share of the lead after three rounds of the Pebble Beach National Pro-Am.

The Fijian joined Dudley Hart at the top of the leaderboard on nine-under-par in the $1.08 million event with four birdies and a bogey to go along with an eagle at the par five 11th at Spyglass Hills.

Singh and Hart hold a two-shot lead over Dustin Johnson and Michael Allen, who are at seven under.

The 44-year-old Singh, who has 31 career PGA Tour victories, is seeking his first win since the Arnold Palmer Invitational in March 2007.

Hart used a strong finished to claim a share of the lead with Singh. He birdied three of the final four holes, including the 17th and 18th, for a bogey-free 68.

That put Hart in position for his third career victory. He has not won since the 2000 Honda Classic and has just one top-three finish since 2004.

Johnson overcame bogeys at the second and the 10th with an eagle at the par four 13th before finishing his round with a birdie at the 18th hole. Allen, who started the day one shot off the lead, signed for a one-under-par 71.

Defending champion Phil Mickelson, a three-time winner of this event, was struggling to stay in contention before he unravelled with an 11 on the par five 14th and skied to a 78, falling 14 shots and missing the cut.

A cluster of six players are three shots back at six under, including Steve Lowery, who had one of the more bizarre rounds of the day.

After opening with seven straight pars, Lowery had a bogey, two double-bogeys and seven birdies in his final 11 holes to finish with a 70.

Tim Herron, the overnight leader, stumbled on the back nine and is in a pack of eight players at five under.

Reigning British Open champion Padraig Harrington started fast and finished fast but was staggered by a triple-bogey on the par five 11th. His 70 left him in a group of seven players five shots off the lead.