Raducanu positioned herself behind the umpire's chair and there were no microphones to pick up what was said, though Muchova sensed that her opponent was struggling and consoled her as the Briton dabbed her eyes with a towel.

Emma Raducanu has now won all three of her matches against Maria Sakkari without dropping a set; she will face 14th-seeded Karolina Muchova in the second round; Brazilian teenager Joao Fonseca wins hi