Grand Blanc:Vijay Singh held off a late charge by Tiger Woods to retain his Buick Open title by four shots at Grand Blanc, Michigan. The Fijian, five strokes clear overnight, fired a two-under-par 70 to finish on 24-under 264 at the Warwick Hills Golf and Country Club and secure his fourth PGA Tour victory of the year. World number one Woods, back in action for the first time since winning the British Open two weeks ago, vaulted into a tie for second place with a 66 that included six birdies and an eagle-two at the 14th. Woods, eight off the pace at the start of the day, picked up seven shots in seven holes from the par-three 11th on his way to a scorching back nine of six-under 30. Indian-born Swede Daniel Chopra finished tied for 12th at 14 under par.