World number one golfer Tiger Woods of the United States has shot a 5-under-par, 67 to take a three-shot lead over Phil Mickelson at the PGA's Grand Slam of Golf in Hawaii.

Woods started slowly but carded four birdies (one shot under par on a hole) in the back nine to take the lead. The world number one has been troubled by a stomach virus, but was able to recover enough to play.

Meanwhile, PGA Champion Phil Mickelson got his day off to a strong start shooting four birdies and a bogey (one shot over par on a hole) on the front nine. He added another birdie on the 15th hole, but then bogied the 16th and 17th holes to finish the day at 2-under-par, 70.

U.S. Open champ Michael Campbell of New Zealand shot a 1-over-par, 73 while world number two Vijay Singh of Fiji had a 3-over-par, 75. Singh was selected as an alternate for the event because of his performances in this year's major tournaments.

The elite, four-man 36-hole event is open to the winners of this year's major tournaments and is being played on the Poipu Gold Course in Kauai.

Some information for this report provided by Reuters.