Zverev hails beaten Djokovic as 'greatest of all time'
Djokovic needed a maiden Olympic singles gold medal and the US Open to complete a calendar Golden Slam after winning the first three majors of the year.
Alexander Zverev said he felt sorry for ending Novak Djokovic's tilt at a Golden Grand Slam at the Olympics on Friday, hailing the beaten world number one as "the greatest
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