The world number one moved into a two-shot lead after the second round of the $5.6 million Wachovia Championship on Friday.
With Tiger Woods hitting golf balls at a juniors clinic in South Carolina earlier this week, media speculation has been mounting that the former world number one could make his PGA Tour return within the next month.
Tiger Woods ended weeks of speculation on Friday when he announced he will play in next week's Masters golf tournament at Augusta National.
