French Open: Swiss showdown on the cards as Stan Wawrinka set up Roger Federer clash in quarters

Switzerland's Stan Wawrinka outlasted Greece's Stefanos Tsitsipas 7-6 (8-6), 5-7, 6-4, 3-6, 8-6 in a marathon French Open fourth-round clash that lasted five hours and nine minutes, the longest match at this year's edition of the second Grand Slam event of the season.

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