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Two many seeds, not enough stars at 21 and not enough serve and volley. Swiss tennis player Marc Rosset who won Olympic gold back in 1992 says 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.
Rossett disagrees:

Photo credit: getty images