Stanislas Wawrinka beat Feliciano Lopez 6-3 3-6 6-3 at the Paris Masters to end Nicolas Almagro's World Tour Finals chances.
Roger Federer confirmed his spot at the end of season ATP Tour finals by reaching the third round of the Paris Masters.
Jo-Wilfried Tsonga double-faulted on match point to lose to Kei Nishikori and fail to qualify for the World Tour Finals.
Novak Djokovic started his Paris Masters campaign with a routine second-round 7-6(3) 6-3 win over Pierre-Hugues Herbert.
Roger Federer's unhappy season continued on Sunday when he lost to Juan Martin del Potro in the final of the Basel Open.
Janko Tipsarevic’s Valencia Open campaign was over almost as soon as it began in his first-round tie against Marcel Granollers.
Feliciano Lopez came through a tough clash with Jarkko Nieminen to make it through the opening round of the Shanghai Masters.
John Isner was pushed hard before coming through a tough opening match at the Shanghai Masters.
Roger Federer has no plans to retire despite his struggles to find his form in 2013.
ATP World Tour rankings on Monday (last week's positions in brackets):
Order of play for day five of the US Open, with Andy Murray, Novak Djokovic, Serena Williams and Laura Robson all expected on court.
Order of play for day three of the US Open, with Andy Murray and Serena Williams both in action.
Organisers have announced the seedings for the US Open and Roger Federer is seeded only seventh.
Round-up: Roger Federer got his hardcourt season off to a positive start with straightforward win over Phillip Kohlschreiber.
ATP World Tour Finals
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