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ST ANDREWS, SCOTLAND - JULY 13: Dustin Johnson of the United States answers questions during a news conference ahead of the 144th Open Championship at The Old Course on July 13, 2015 in St Andrews, Scotland. (Photo by Mike Ehrmann/Getty Images)

ST ANDREWS, SCOTLAND - JULY 13:  Dustin Johnson of the United States answers questions during a news conference ahead of the 144th Open Championship at The Old Course on July 13, 2015 in St Andrews, Scotland.  (Photo by Mike Ehrmann/Getty Images)