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Fans gathered en masse around the 18th green during second-round action on Friday.
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Defending champion Rory McIlroy blasted out of a bunker on the 10th hole during the second round.
Andrew Redington/Getty Images
Charlie Wi launched his tee shot on the 11th hole on Friday.
World No. 1 player Luke Donald had to hit his third shot on the 11th hole Friday from the bunker.
Harry How/Getty Images
Matt Kuchar closely followed the track of his putt on the seventh hole on Friday.
Fans on the 18th hole watched from the grandstands as Rory McIlroy played his shot on Friday.
Ian Poulter sprayed some sand as he played a bunker shot on Friday.
Graeme McDowell, US Open champion in 2010, tried to land his shot on the ninth hole inside the myriad bunkers around the green on Friday.
Michael Thompson was the surprise leader after round one. His score of 4-under par bested the field by three shots and he was one of four players under par.
The first day of the US Open opened with the power pairing of Tiger Woods, left, and Phil Mickelson, two of the first players to tee off.
Ezra Shaw/Getty Images
Hundreds of people crowded around the tee boxes to watch Woods, in pursuit of his major since 2008.
This year's US Open is being held the Olympic Club in San Francisco. The course has no water, but treacherous bunkers.
Scenic views of San Francisco can be scene from the course, which is hosting its fifth US Open.
Fans packed the course for the opening round, some with interesting devices to get them different views of the action.
As if the Tiger Woods-Phil Mickelson pairing weren't enough, the duo was playing with Masters champion Bubba Watson.
Amateur Andy Zhang, shown teeing off on the fourth hole, was the youngest player in the field at 14.
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