This golf ball is autographed by the #1 golfer in the world, Rory McIlroy. 

In 2014, Rory won the PGA, the British Open, and the World Golf Championship! Rory is one of four players in the last century of golf to win four majors by the age of 25. 

The ball is a Nike RZN Black ball developed through a collaboration between Nike and DuPont.