Federer hails 'unbelievable' Djokovic but 'hard to say' who's greatest

[ASFN Admin]

Roger Federer described Novak Djokovic's record-breaking 23rd Grand Slam title achievement as "unbelievable" on Wednesday but avoided anointing his old rival as the greatest player of all time."I think what Novak has done is unbelievable," said Federer, who racked up 20 Grand Slams before he retired last year.

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