Novak Djokovic heads into the US Open in sizzling form

Djokovic ha vinto 13 titoli Slam (meglio di lui solo Sampras con 14, Nadal con 17 e Federer con 20) Source: Getty

The Serb collected a fourth Wimbledon title and completed a sweep of Masters 1000 events over the last month. He's the favorite coming into the last major of the year. Journalist Riccardo Bisti reports.

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