Tennis player Roger Federer has released a music video with his 'boyband', the #BackhandBoys, singing American rock group Chicago's song 'Hard To Say I'm Sorry'. The video features tennis players Tommy Haas and Grigor Dimitrov, besides musician David Foster and a cameo by Novak Djokovic. Federer captioned the video, "No seriously, we're actually starting a boyband: The one handed #BackhandBoys."