Roger Federer joins Novak Djokovic and Andy Murray in Shanghai Masters third round amid tight security As the tournament kicked into life with the introduction of the big guns, America's Sam Querrey sent Kei Nishikori tumbling 2-6, 6-1, 6-4 just days after his opponent became the first Japanese player to win the Japan Open. Federer's build-up to the Shanghai tournament was clouded by a death threat from a blogger in China, but the Internet user, in a fresh posting on the popular baidu.com site, later apologised. He remained at large. "Very pleased with my serving in Beijing and obviously the first match today," said the second seed, who lost just five of his service points. So that's something that I've been working on, obviously. The Serbian will next play Spaniard Feliciano Lopez, who beat German 16th seed Philipp Kohlschreiber 6-3, 6-4. US Open champion Murray did not even have to take to the court as Germany's Florian Mayer withdrew with a rib injury, giving the Scot a walkover. Japan's Nishikori, suffering from an ankle problem, was brought down to earth with a bump after his title win despite a strong start against Querrey, who won five straight games from 4-1 down in the decider to seal the match. There were wins for fourth seed Tomas Berdych of the Czech Republic, fifth-seeded Frenchman Jo-Wilfried Tsonga, sixth seed Janko Tipsarevic of Serbia and 13th seed Wawrinka. But among the seeds to fall were Raonic and the French pair of Richard Gasquet and Gilles Simon.