mo4ch:>'I'm the happiest man on earth!': 20yo Tsitsipas shocks champion Federer at Aus Open (PHOTOS) | Mo4ch News

Australian Open champion Roger Federer has suffered a shock defeat to Stefanos Tsitsipas, who at just 20 years old is 17 years his junior, to become the first Greek player ever to reach the quarter finals of a Grand Slam.There was no Greek tragedy for world number 15 Tsitsipas, who served up a classic performance against the 6-time Australian Open winner and 20-time major winner 6-7, 7-6, 7-5, 7-6, on Sunday in Melbourne to book his place in the last eight. "There's nothing I can describe it to, I'm the happiest man on earth right now, I can't describe it," an overwhelmed Tsitsipas told John McEnroe in his post-match interview.Tsitsipas' reward for squeezing past veteran Federer at Rod Laver Arena is a date with Andy Murray-conquerer Roberto Bautista Agut in the quarter-final on Tuesday. For Swiss legend Federer, he failed to make the final eight of the tournament for only the second time in 16 years of his remarkable tennis career.Tsitsipas had to endure a g…