US golfer Phil Mickelson reacts after missing a putt on the 18th hole during his first round 63 on the opening day of the 2016 British Open Golf Championship at Royal Troon in Scotland on July 14, 2016.
Former champion Phil Mickelson went clear at the top of the leaderboard at the British Open on Thursday after a stunning eight-under-par first round of 63 at Royal Troon.
 / AFP / ANDY BUCHANAN / RESTRICTED TO EDITORIAL USE        (Photo credit should read ANDY BUCHANAN/AFP/Getty Images)