Roger Federer to appear on 'Running wild with Bear Grylls'
Swiss tennis star Roger Federer is set to appear on the show 'Running wild with Bear Grylls'. Grylls, widely known for television series 'Man vs Wild', posted their picture on Instagram with the caption, "A humble, fun, determined, family centred man. Just slightly upset that he beat me at mini ping-pong on the top of the cliff face! So annoying...."