![US Open: Novak Djokovic going 'back to basics' against Alexander Zverev in semi-finals](https://cdn.newsserve.net/ONPglobe256.png)
US Open: Novak Djokovic going 'back to basics' against Alexander Zverev in semi-finals
Novak Djokovic has "had enough of" talking about his bid for a calendar Grand Slam as he prepares to face Alexander Zverev in the US Open semi-finals.
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