Markham, Ontario:Vijay Singh patiently worked his way up the leaderboard, leaving playing partner Mike Weir behind again in the Canadian Open on Friday.
The 2004 winner in a playoff with Weir, Singh shot a 6-under 65 to finish the second round a stroke behind leaders Steve Allan and John Mallinger.
Weir nearly missed the cut for the second straight year and 11th time in 16 starts in his national championship. The Canadian followed his opening 71 with a 70 to qualify for weekend play by a stroke at 1 under.
Allan added a 68 to his opening 64 to match Mallinger (66) at 10-under 132 on Angus Glen's North Course. Tripp Isenhour (68) joined Singh at 9 under.
Allan birdied the par-3 17th, hitting his tee shot within inches on the 206-yard hole, and saved par on the par-4 18th with a 10-foot putt.
Mallinger had five birdies in his bogey-free round.
Singh made a 40-foot putt from just off the green on the par-3 14th to reach 8 under, and briefly tied Allan for the lead with a two-putt birdie on the par-5 15th. The three-time major champion also made a 25-footer for par on 17.
"I'm looking forward to playing a solid weekend," Singh said. "Win or lose, I'll go out there and try to play my game."
The 44-year-old Fijian won the season-opening Mercedes-Benz Championship and the Arnold Palmer Invitational in March to push his US PGA Tour victory total to 31. He has won a tour-record 19 times since turning 40.
Ryan Palmer (67) and Michael Putnam (68) were 8 under, and defending champion Jim Furyk (66) was another stroke back along with Cliff Kresge (65), Doug LaBelle II (68) and Brandt Snedeker (68). Hunter Mahan, the first-round leader after matching the tournament record with a 62, shot a 74 to drop four strokes back at 6 under.