"He missed an easy backhand and I think mentally I just relaxed after that, " Djokovic said.

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If I can just stay relaxed -- I really feel like I can do it, but, you know, I'm sometimes my own worst enemy.

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"I've never relaxed - apart from Harry Potter where I just had fun!"

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It just always relaxed me and it was what I looked forward to at the end of the day.

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