He recalled scoffing at a proposal, only to learn that the team putting it forward already had started testing the idea with an experiment.

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The 2010 U.S. Open champion Graeme McDowell started the final round in second but endured a testing afternoon, dropping back to 14-under as he finished in third alongside Phil Mickelson, Spaniard Sergio Garcia and Australian Adam Scott.

CNN: Tiger tames the Blue Monster to take 17th WGC title