Federer wears down Wawrinka to maintain mastery over compatriot

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. Federer upped his career record against his Swiss compatriot to 21-3.

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