This depends on whether searching for single or double players. The top single female tennis player of 2012 is Victoria Azerenka and for doubles the top player is Roberta Vinci.
Venus or Serena Williams.
netball and tennis
Martina Hingis 1# 1977 , 16 years old
Billie Jean King
As of December 2010, Rafael Nadal is the number 1 ranked male tennis player. As of January 2011, Caroline Wozniacki is the number 1 ranked female tennis player.
The worlds top men's tennis players are 1. ROGER FEDERER and 2. RAFAEL NADAL! Serena Williams remains World No. 1 female player. She is also becoming a top doubles player as well ... so this makes her unique on today circuit, as an all-around accomplished top player.
Former top-seeded tennis player was Roger Federer, Now it is Novak Djokovic
Billy Jean King
Novak Djokovic is the top male tennis player on the ATP rankings.
Sharapova is a great tennis player even though Azarenka is #1 top tennis player