World number one Roger Federer was stunned by a 3-6, 7-6, 6-4 second-round defeat at the hands of unseeded Frenchman Julien Benneteau in the ATP Paris Masters.The Swiss ace was looking good right from the word go but tumbled in the second set. Benneteau, the world number 49, took full advantage of FedEx's unforced errors and took the game away from the master.On the other hand, Spaniard second-seed Rafael Nadal won a thriller against compatriot Nicolas Almagro 3-6, 7-6, 7-5 in three hours and 14 minutes to cruise into the third round.