Switzerland's Stan Wawrinka edged sixth seed Stefanos Tsitsipas of Greece 7-6 (6), 5-7, 6-4, 3-6, 8-6 after five hours and nine minutes at Roland Garros in Paris on Sunday to reach the quarter-finals at a Grand Slam tournament for the first time in two years. The 24th-seeded Wawrinka, who, at 34, is 14 years older than Tsitsipas, will face his friend and compatriot, Roger Federer, in the last eight.