There were straight sets victories for seven entrants to the Rogers Cup quarterfinals at Montreal on Thursday. Only Frenchman Jeremy Chardy had to struggle against Croatia’s Ivo Karlovic. No.1 seed Novak Djokovic needed just 54 minutes to dispose of USA’s Jack Sock and no.2 seed Andy Murray defeated Gilles Muller of Luxembourg in little over an hour. Japan's Kei Nishikori and Rafael Nadal also had cakewalks of victories, which paved the way for a quarterfinal showdown between them. Others easing