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SAN FRANCISCO, CA - APRIL 28: Rory McIlroy of Northern Ireland in action during the pro-am as a preview for the World Golf Championships - Cadillac Match Play held at Harding Park on April 28, 2015 in San Francisco, California. (Photo by David Cannon/Getty Images)

SAN FRANCISCO, CA - APRIL 28:  Rory McIlroy of Northern Ireland in action during the pro-am as a preview for the World Golf Championships - Cadillac Match Play held at Harding Park on April 28, 2015 in San Francisco, California.  (Photo by David Cannon/Getty Images)