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SAN FRANCISCO, CA - MAY 01: Rory McIlroy of Northern Ireland shakes hands with his opponent Billy Horschel of the USA after McIlroy had won on the second extra hole of their match during round three of the World Golf Championships Cadillac Match Play at TPC Harding Park on May 1, 2015 in San Francisco, California. (Photo by David Cannon/Getty Images)

SAN FRANCISCO, CA - MAY 01:  Rory McIlroy of Northern Ireland shakes hands with his opponent Billy Horschel of the USA after McIlroy had won on the second extra hole of their match during round three of the World Golf Championships Cadillac Match Play at TPC Harding Park on May 1, 2015 in San Francisco, California.  (Photo by David Cannon/Getty Images)