Stefanos Tsitsipas Knocks Defending Champion Roger Federer Out of Australian Open Unknown 00:49 IFTTT, Top Sports News- News18.com The pair's only previous meeting in the mixed team Hopman Cup earlier this month was a tight affair where Federer had won courtesy of two tiebreaks. from Top Sports News- News18.com http://bit.ly/2ATacnp via IFTTT Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsPV Sindhu vs Carolina Marin, Live Score, Badminton World Championships: Old Foes to Battle for Top PrizeDonald Trump aims tweet at LeBron James, questions his intelligenceSeedorf and Kluivert Take Over Cameroon National SideIndia vs England: Virat Kohli bemoans lack of application from top order batsmenBWF World Championship semi-final: PV Sindhu beats Akane Yamaguchi, sets up summit...Juan Martin Del Potro to face Fabio Fognini in Los Cabos Open final