The cancellation of Wimbledon this summer deprived fans of their annual exercise in moralising. There is one topic SW19-goers love to complain about every year: the grunting sounds that players emit as they hit the tennis ball.

Maria Sharapova, who retired in February, was called the Queen of Screams. Her grunts were once recorded at 101 decibels, more than a Boeing 707 as it touches down.