Ben Rothernberg: I think it is likely to improve for Novak as he gets older like it did with Serena

Jason Pine chats to New York times Tennis journalist Ben Rothenberg, as they reflect on Novak Djokovic's winning grand slam title number 20, to equal Rafael Nadal and Roger Federer on 20 titles - as he looks to become statistically the greatest men's tennis player in history.

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