Rookie Jason Day remains in contention for his maiden PGA Tour title, sitting just three shots behind leaders Dudley Hart and Vijay Singh after the third round of the Pebble Beach Pro-Am. Day followed his opening rounds of 69 and 70 with a one-under-par 71 to move to six-under for the tournament. It could have been so much better, though, for the 20-year-old Queenslander, who hit a double-bogey six on the first hole and then three further bogeys to go along with six birdies in a mixed third round. Australian veteran Greg Norman, playing in his first PGA Tour event in 18 months, shot 79 to miss the cut by 10 strokes. Hart, who missed half of last year to care for his sick wife, birdied three of the last four holes to card a four-under 68 and surge into a share of the lead at nine-under with 2004 champion Singh. The Fijian holed an eagle on the 12th in his way to a round of 67. The pair is two shots ahead of PGA Tour rookie Dustin Johnson (68) and fellow American Michael Allen (71). Day is one of six players on six-under, alongside Americans Steve Lowery, Jeff Quinney and Ryan Armour, Swede Fredrik Jacobson and Korean Y.E. Yang. Day&aposs compatriots Mathew Goggin (72) and Andrew Buckle (71) are at three-under.