Padraig Harrington is three shots off the lead after an opening round of 66 at the Sony Open in Hawaii.
The three-time major did bogey the first hole, but went on to card four birdies to lie on four under alongside the likes of Lucas Glover and Davis Love III. Graeme McDowell is on level par after a round of 70,
Five players share the lead on seven under after rounds of 63, including veteran Vijay Singh, who if he emerges victorious on Sunday will become the oldest winner in the history on the PGA Tour.
The 53-year-old came close to sinking an eight-foot eagle putt on the 18th that cost him the outright lead at Waialae Country Club.
Singh holds the lead alongside Brandt Snedeker, Kevin Kisner, Ricky Barnes and Morgan Hoffmann, one clear of Si Woo Kim, Zach Johnson and Charles Howell III.
Singh, starting on the back nine, opened with a birdie on the 10th and picked up further shots on the 12th and 17th to turn in 32.
He followed that up with further birdies on the first and second before closing out his round with birdies on the final two holes - narrowly missing with that eagle attempt on the ninth.
But it wasn't such a good day for defending champion Jimmy Walker.
Walker, who is seeking a third straight Sony Open title this week, is down the field tied for 68th after a one-under 69.
He bogeyed the eighth hole but immediately picked that shot back up at the ninth with an eagle before dropping a further shot at the 14th and birdieing the 18th to finish under par.