'Unbeatable' Jannik Sinner has a 'mental problem' says tennis legend Boris Becker after world No1 crashed out of French Open ⊕
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a story from The Daily Mail 💩 › The Daily Mail
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Sinner, 24, was seemingly coasting on a sweltering day in the Paris sunshine, having raced into a comfortable two-set lead, before serving for the match in the third.