U.S. Open 2013 (51 images)

Golf fans watch from a balcony during the second round 113th U.S. Open Championship at Merion Golf Club in Ardmore, Pennsylvania on June 14, 2013. UPI/Kevin Dietsch

Phil Mickelson watches his drive off of the 1st tee box during the second round 113th U.S. Open Championship at Merion Golf Club in Ardmore, Pennsylvania on June 14, 2013. UPI/Kevin Dietsch

Hideki Matsuyama hits a tee shot on the 16th hole in the second round at the 113th U.S. Open at Merion Golf Club in Ardmore, Pennsylvania on June 14, 2013. UPI/John Angelillo

Billy Horschel talks to a USGA official on the 15th green in the second round at the 113th U.S. Open at Merion Golf Club in Ardmore, Pennsylvania on June 14, 2013. UPI/John Angelillo