Sabine Lisicki exits U.S . to Ekaterina Makarova . Wimbledon finalist loses in straight sets in last 32 clash . Li Na of China avenges 2012 defeat to Laura Robson . Top seed Novak Djokovic eases into men 's third round .
Sabine Lisicki exits U.S .Open to Ekaterina Makarova . Wimbledon finalist beaten in straight sets in last 32 clash . Li Na of China avenges 2012 defeat to Laura Robson . Top seed Novak Djokovic eases into men 's third round .