Roger Federer vs Stefanos Tsitsipas result: Defending champion knocked out of 2019 Australian Open Jan 20, 2019 The 20-year-old Greek beat Federer 6-7 (11) 7-6 (3) 7-5 7-6 (5) to move through to a first grand slam quarter-final Share 0 Share on Facebook Tweet Tweet on Twitter +1 +1 on Google Plus