( CNN ) -- Novak Djokovic walked on to the court in a Darth Vader mask -- but it was the world No . 1 elect who was spooked after crashing out of the Paris Masters in his opening match . The Serbian tennis star , who is known for his pre-match antics , suffered a Halloween horror show as he lost 0-6 7-6 ( 7-5 ) 6-4 to Sam Querrey in the second-round clash . Federer to surrender world No . 1 ranking . The U.S. player , ranked 23rd , hit 18 aces on his way to grinding out victory in two hours , meaning Andy Murray is the highest-ranked player left in a field weakened by the absence of current No . 1 Roger Federer and Rafael Nadal . Murray secured his place in the next round following a comfortable 7-5 6-3 win over Paul-Henri Mathieu of France and will now face Poland 's Jerzy Janowicz . At least Djokovic will now have a sufficient recovery period ahead of the World Tour Finals , which begin in London on Monday -- when he officially returns to the top of the rankings due to Federer 's decision not to defend his Paris title . `` I knew the main problems would be my energy , it was n't there during the second set . I really felt my level drop , '' Djokovic said . `` I struggled every game , but on the brighter side I have time to rest . I 've been through a really difficult period this last few weeks . There have been a lot of things on my mind , some things happened . `` I have a couple of days now to rest . I 've had to face some things a bit unusual for me , but when you lose a match you move on and go to the last tournament of the year . '' Djokovic beats Murray in classic Shanghai final . Querrey , who will next play either Canadian 14th seed Milos Raonic or Frenchman Jeremy Chardy , was relieved to recover after losing the first eight games of the match . `` It was a little embarrassing . I walked over to my girlfriend and my chiropractor and I said , ' I hope I can get two games in this set . ' `` Once I got the two games I kind of settled down . I was like , 'Okay , that 's all I want . ' But then I got rolling and got more confidence and started serving better and being a little more aggressive . '' While Djokovic is assured of his place in the eight-man London line-up , his compatriot Janko Tipsarevic is still fighting to earn one of the remaining two berths at the season finale . Tipsarevic defeated Dutchman Igor Sijsling 6-4 7-6 ( 7-0 ) to ensure his passage to the third round , where he will face Argentine ninth seed Juan Monaco -- who can potentially qualify if he reaches the final , depending on other players ' results . However , Richard Gasquet 's hopes of making it to London ended when the the French 12th seed lost to big-serving South African Kevin Anderson in three sets . Elsewhere , Juan Martin Del Potro eased past Colombia 's Alejandro Falla 6-2 6-2 to set up a third round clash with France 's Michael Llodra . Llodra ovecame 10th seed John Isner 6-4 7-6 ( 7-5 ) to end the American 's hopes of making it through to London . Nicolas Almagro will take on Jo-Wilfried Tsonga in the third round after he overcame fellow Spaniard Albert Ramos 7-6 ( 7-1 ) 6-7 ( 4-7 ) 6-3 . France 's Gilles Simon will face Japan 's Kei Nishikori following a straight forward 7-5 6-3 win over Victor Hanescu .
Novak Djokovic loses to Sam Querrey in his opening match at Paris Masters . Serbian star will still become new world No.1 despite defeat . Score: 7 Richard Gasquet 's hopes of reaching London finals end with defeat .