Federer started off to a slow start against the countryman and Swiss No. 1 Stan Wawrinka .
Federer had an uneasy ride before losing the first set to Wawrinka 6 - 3 .
Starting off to a slow start against the countryman and Swiss No. 1 Stan Wawrinka , Federer had an uneasy ride before losing the first set to Wawrinka 6 - 3 .