ReutersFederer wears down Wawrinka to maintain mastery over compatriotReuters(Reuters) - Roger Federer continued his mastery over Stan Wawrinka, but not before getting a fright en route to a 6-7(2) 7-6(6) 6-2 quarter-final victory at the Cincinnati Masters on Friday. Aug 17, 2018; Mason, OH, USA; Roger Federer (SUI) serves ...and more »