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SAN FRANCISCO, CA - MAY 02: The match referee (2nd R) moves in to talk to Rory McIlroy of Northern Ireland and Paul Casey of England on the 16th green the third extra hole of their match where the decision was made to halt play for the day because of fading light during the quarter final match in the World Golf Championships Cadillac Match Play at TPC Harding Park on May 2, 2015 in San Francisco, California. (Photo by Christian Petersen/Getty Images)

SAN FRANCISCO, CA - MAY 02:  The match referee (2nd R) moves in to talk to Rory McIlroy of Northern Ireland and Paul Casey of England on the 16th green the third extra hole of their match where the decision was made to halt play for the day because of fading light during the quarter final match in the World Golf Championships Cadillac Match Play at TPC Harding Park on May 2, 2015 in San Francisco, California.  (Photo by Christian Petersen/Getty Images)