Wawrinka To Play Federer In Semis, Finishes Group A With 2-1 Record Stan Wawrinka will play his Swiss compatriot Roger Federer, the six-time former champion, in the semi-finals of the Barclays ATP World Tour Finals on Saturday. [[More Tennis News on ATPWorldTour.com]] Author: sportallinfo Published: 14 novembre 2014 Categories: Tennis