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ST ANDREWS, SCOTLAND - JULY 17: Jordan Spieth of the United States and Dustin Johnson of the United States look on from the 6th tee during the second round of the 144th Open Championship at The Old Course on July 17, 2015 in St Andrews, Scotland. (Photo by Streeter Lecka/Getty Images)

ST ANDREWS, SCOTLAND - JULY 17:  Jordan Spieth of the United States and Dustin Johnson of the United States look on from the 6th tee during the second round of the 144th Open Championship at The Old Course on July 17, 2015 in St Andrews, Scotland.  (Photo by Streeter Lecka/Getty Images)