MELBOURNE, Australia -- Two-time defending champion Roger Federer's has been upset in the fourth round of the Australian Open by Stefanos Tsitsipas, who becomes the first player from Greece to reach the quarterfinals at a major.
Tsitsipas converted one of his three breakpoint chances in the match and fended off all 12 he faced to beat the 20-time major winner 6-7 (11), 7-6 (3), 7-5, 7-6 (5)
The 37-year-old Federer had a set point in 10th game of the second for a 2-0 lead but Tsitsipas saved it with a service winner.
Federer has won the last two Australian titles and has six overall at Melbourne Park, a record he shares with top-ranked Novak Djokovic and Roy Emerson.