VIDEO PLAYLIST

• Tsitsipas: 'I'm the happiest man on Earth right now'

  Tsitsipas: 'I'm the happiest man on Earth right now'

  Stefanos Tsitsipas reacts to defeating Roger Federer in the fourth round of the Australian Open.

  Tags: Tennis, Stefanos Tsitsipas, ATP
• Federer upset by Tsitsipas at Australian Open

  Federer upset by Tsitsipas at Australian Open

  Defending champion Roger Federer loses in four sets to Stefanos Tsitsipas in the fourth round of the Australian Open.

  Tags: Tennis, Roger Federer, ATP, Stefanos Tsitsipas