Roger Federer at this stage of his career has accomplished almost each and everything in tennis. He has won 18 Grand Slam titles and is widely regarded as the greatest tennis player in the history of the game. So at the wise old age of 35, Federer can perhaps afford to loosen up a bit express himself better. In this video, Federer can be seen in an avatar, which tennis fans have never seen. See him take on Alexander Zverev in the Bongo Cam challenge at the Hopman Cup in Perth.