Roger Federer's bid for 3rd consecutive Australian Open title ends in surprising 6-7 (11), 7-6 (3), 7-5, 7-6 (5) loss to 20-year-old Stefanos Tsitsipas, the 1st player from Greece to reach Grand Slam quarterfinal
Federer, 37, shocked by Tsitsipas, 20, at Australian Open
