Women are not ranked by the ATP, but by the WTA (Women's Tennis Association). The current number one in singles is Victoria Azarenka, and in doubles it is Cara Black.
The current highest ranked player in the WTA is Chris Evert.
As far as WTA rankings go, as of June 23, 2008 the highest ranked Belgian woman is Yanina Wickmeyer at #69. She is the only Belgian woman ranked in the top 100.
Serena Williams is ranked number one, and is the player to have won the most grand slams on the WTA tour at the moment. So, in my opinion, she is the best. But, Steffi Graf (a retired player) has won many more grand slams than Serena.
The MP3 player that is ranked highest in customer satisfaction is the Sandisk Sansa Clip Zip. This no frills player is fun and small and perfectly portable.
Andy Roddick is the highest ranked American. He is #5 overall. The next is Sam Querry and then James Blake.
his name is raffi
Andreas Seppi (18)
Steffi Graf was ranked world number 3 when she retired in August 1999.
There are no ranks in billiards. There are different tournaments that result in a player getting ranked from their play and win:loss ratios, so there is a ranking of players that changes regularly. The top ranked player, a temporary rank, is simply called the top ranked player.
#1 non-retired player is Magnus Carlsen. Rank:GM(Grandmaster)