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ST ANDREWS, SCOTLAND - JULY 20: Jordan Spieth of the United States and caddie Michael Greller line up a putt on the 7th green during the final round of the 144th Open Championship at The Old Course on July 20, 2015 in St Andrews, Scotland. (Photo by Stuart Franklin/Getty Images)

ST ANDREWS, SCOTLAND - JULY 20:  Jordan Spieth of the United States and caddie Michael Greller line up a putt on the 7th green during the final round of the 144th Open Championship at The Old Course on July 20, 2015 in St Andrews, Scotland.  (Photo by Stuart Franklin/Getty Images)