Young Stefanos Tsitsipas signalled a changing of the guard at the top of world tennis as he shocked defending champion Roger Federer in the Australian Open fourth round Sunday. "I'm the happiest man on earth right now. "Roger is a legend of our sport," said Tsitsipas. "I have so much respect for him. It's a dream come true."

Source: Economic Times January 20, 2019 12:22 UTC