McIlroy's girlfriend calls him onto tennis court Defending U.S. Open golf champion Rory McIlroy "serves" to Maria Sharapova ...

McIlroy's girlfriend calls him onto tennis court

Defending U.S. Open golf champion Rory McIlroy "serves" to Maria Sharapova of Russia after his girlfriend Caroline Wozniacki (R) of Denmark invited him to play for her in the BNP Paribas Showdown at Madison Square Garden in New York, March 5, 2012.(Photo/Reuters)

Defending U.S. Open golf champion Rory McIlroy gets a racket and tennis balls from his girlfriend Caroline Wozniacki (L) of Denmark after she invited him to play for her against Maria Sharapova of Russia in the BNP Paribas Showdown at Madison Square Garden in New York, March 5, 2012. (Photo/Reuters)

Defending U.S. Open golf champion Rory McIlroy hugs his girlfriend Caroline Wozniacki of Denmark after she invited him to play for her against Maria Sharapova of Russia in the BNP Paribas Showdown at Madison Square Garden in New York, March 5, 2012. (Photo/Reuters)

Defending U.S. Open Champion Rory McIlroy (L) is called out of the stands by his girlfriend Caroline Wozniacki (front C) of Denmark after she invited him to play for her against Maria Sharapova in the 2012 BNP Paribas Showdown at Madison Square Garden in New York, March 5, 2012. (Photo/Reuters)

Golf's new world number one Rory McIlroy tried his hand at a different sport March 5, winning a rally against Maria Sharapova during his girlfriend Caroline Wozniacki's tennis exhibition in New York.