A Grand Slam title might have eluded Roger Federer for two years now but there is no way that the 33 year old can be written off as a spent force, according to his former coach Tony Roche.
Roche said that the Swiss Master can play as long as he wants, especially on the mental side, adding that physically, he will be good enough t play at the top level for another four or five years at the very least.
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