Woods unsure about comeback date

Former world number one Tiger Woods says he is unsure when he will return to competitive golf after undergoing back surgery.

After spending 14 months back at the top of the rankings Woods was recently usurped as number one by 2012 Masters champion Adam Scott.

With no timetable set for his return, the 14-time major winner is now almost certain to miss next month's US Open in North Carolina.

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