( CNN ) -- World number two Roger Federer continued his perfect start to the U.S. Open , brushing aside Germany 's Andreas Beck 6-3 6-4 6-3 on the Arthur Ashe Center Court . The Swiss , who won the Flushing Meadows tournament five times in a row between 2004 and 2008 , is yet to drop a set at the New York event . Last year 's beaten finalist took just one hour and 41 minutes to defeat Beck and will face France 's unseeded Paul-Henri Mathieu in the third round , who carded a 7-6 6-4 6-3 victory over compatriot Guillaume Rufin . Number three seed Novak Djokovic had to contend with crowd trouble on center court to overcome Philipp Petzschner , taking the match 7-5 6-3 7-6 . The incident occurred in the eighth game of the opening set , when there was a disturbance in the stands as Djokovic was set to claim the first service break of the match . According to the New York Times , a fight broke our between a male fan and two spectators , a woman in her 40 's and an elderly man . The row culminated with both men falling over two rows of seats before the three individuals involved were handcuffed and taken to a local police station . The 23-year-old Djokovic noticed the incident and told the newspaper : `` It was far away from the court ; we could n't really see what was going on . I hope it was no Serbian up there . '' Petzschner recovered to hold his serve , but Serbia 's Djokovic got his break in the final game of the set to claim a straight-sets victory . Russia 's Nikolay Davydenko was stunned by Richard Gasquet , losing 6-3 6-4 6-2 to the Frenchman , who is ranked 38 in the world . The fifth seed is the highest placed player to be eliminated so far in New York , and he was joined by fellow seed Marin Cilic , who also tasted defeat on day four . Number 11 seed Cilic was undone by Kei Nishikori of Japan , eventually losing a five-set epic 5-7 7-6 3-6 7-6 6-1 . In a match lasting just under five hours , Croatia 's Cilic took the opening set before Nishikori leveled the match courtesy of a second-set tie break . It was a similar story for the next two sets , with Cilic claiming a comfortable win in the third , only for world number 147 Nishikori to pick up another tie break success in the fourth before crushing his higher-ranked opponent in the final set . There were no such problems for Robin Soderling , who swept aside home crowd favorite Taylor Dent in a 6-2 6-2 6-4 win . The fifth seed was a man in a hurry , defeating the unseeded American in one hour and 32 minutes . There was reason to cheer for the home crowd , with New York native James Blake advancing to the third round at the expense of Canada 's Peter Polansky . The former world number four took the match in four sets , recovering from one set down to seal a 6-7 6-3 6-2 6-4 triumph .
Number 7 seed Roger Federer defeats Kei Nishikori in straight sets . Serbia 's Novak Djokovic also into the third round after beating Philipp Petzschner . Kei Nishikori becomes the highest placed seed to be eliminated . Philipp Petzschner also suffers defeat against Nikolay Davydenko of Japan .