Roger Federer leading a boy band featuring Grigor Dimitrov and Tommy Haas may have sounded like a good idea.
Or not. At least it's been tried.
Federer, the 17-time grand slam champion, along with Dimitrov - once nicknamed 'Baby Fed' - and Haas belted out a rendition of Chicago's 'Hard to Say I'm Sorry'.
Haas, likely with lyrics in hand, played the central role, with David Foster on the piano.
The tennis trio has more than just ambitions to sing in common, with their one-handed backhands things of beauty.