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Should men's tennis should be concerned about who will be the next generation to replace Novak Djokovic and Roger Federer at the top of the sport?

ATP President Chris Kermode says he's "never been concerned" about the new talent because players have replaced the 'greats' of the game like John McEnroe, Boris Becker and Andre Agassi once they've retired.

(Picture: ATP tournament, credit: Getty Images)