Currently, Rafael Nadal is number one for men's, and Serena Williams is number one for women's.
Serena Williams (United States)
Novak Djokovic is the number one male player in the world. 49-1 this year!
"Yes, Elena Dementieva is a retired Russian tennis player. The highlight of her career was winning the gold medal at the 2008 Bejing Olympics in women's singles tennis. She retired on October 29, 2010, positioned at number 9 in the world."
Roger Federer ended 2009 as world number 1
Stan Smith, the tennis player, was born on December 14th 1946. Stan is a former World number 1 American tennis player who was born in Pasadena, California.
The England men are ranked at number 38 in the world. The England women are ranked at number 21 in the world.
The WTA world number 1 is currently Caroline Wozniacki.