Eight top tennis stars including Roger Federer and Rafael Nadal will participate in the ATP World Tour Finals beginning today.
Success in this event may get Nadal number one rank back while Federer after his recent failures may remain on topfor further some time if he wins the tournament.
There is a difference of 945 points between Nadal and Federer and if Nadal does not lose any match in this tournament then he will become world number one gaining 1500 points.
All players have been divided into two groups in the tournament.
Federer will contest Andy Murray of Britain in Group A while US Open champion Juan Martin Del Potro and Fernando Verdasco of Spain are also included in this group.
In Group B, Nadal, Novak Djokovic, Nikolay Davydenko and Robin Soderling will face each other.
