Defending champion Jannik Sinner has at times struggled in the heat and his shock French Open exit came amid an intense heatwave Inside Sport newsletter: Get an expert guide to the biggest moments shaping the world of sport Get our free Inside Sport newsletter Get our free Inside Sport newsletter Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Wimbledon recorded its hottest opening day at last year’s Championship and the

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