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 .
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 .