Novak Djokovic complains to umpire after ‘the world’s most stupid’ call in his match vs Alexander Zverev

It took just two games for Novak Djokovic's match with Alexander Zverev to erupt, and not in the way many had expected.

This was tipped to be a heavyweight clash between two of the world's very best players, and long, gruelling baseline rallies were ... [3417 chars]

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