Australian Open champion dispatched Cypriot in straight sets . Andy Murray beat Vasek Pospisil in second round of the U.S. Open . Kei Nishikori was forced to work harder in his defeat of Ryan Harrison .
Australian Open champion dispatched Cypriot in straight sets . Andy Murray beat Vasek Pospisil in second round of BNP Paribas Open . Kei Nishikori was forced to work harder in his defeat of Ryan Harrison .