Mickelson will begin the day at Merion Golf Club with a one-shot lead over playing partner Hunter Mahan, Charl Schwartzel and Steve Stricker.
Tiger Woods, on the other hand, will tee off more than three hours behind the leaders and look to make his first charge of the week for a respectable finish, trying to put Saturday's dismal 76 behind him.
We'll keep you updated on the top developments throughout the final round at Merion Golf Club - and scroll down for our previous coverage of U.S. Open week.
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