You haven't heard a lot about Nick O'Hern in the last year or so. The man perhaps best known for beating Tiger Woods in the 2007 World Golf Championships-Accenture Match Play Championship has been battling knee issues for years, and it finally came to a head last summer.

O'Hern played in the 2010 THE PLAYERS Championship and was done for the year after injuring his knee during the event.

O'Hern

The Aussie, a left-hander who has used a long putter for years, is 6 under after 15 holes on Thursday at Redstone. He has the lead outright; Steve Stricker briefly reached 6 under before a bogey on the 16th.

O'Hern needs a big week. He has to earn $312,690 to retain full status on TOUR after being forced to take a medical extension.

NICK O'HERN: Scorecard | Shot Tracker