Federer books Wawrinka clash in Cincy
Roger Federer set up an intriguing all-Swiss quarter-final encounter against Stan Wawrinka with a dominant victory over Leonardo Mayer at the Cincinnati Masters.
Source: http://www.skysports.com/tennis/news/12040/11475270/roger-federer-books-stan-wawrinka-meeting-at-cincinnati-masters