This is a public safety announcement: If you are a ball boy or ball girl at Wimbledon and Milos Raonic is cranking up to serve at almost 150mph, you'd better take cover. The giant Canadian cranked up the fastest serve of the tournament on Wednesday with a 147mph (236.5km/h) howitzer as he downed John Millman in the second round. He also sent down 34 aces, one of which thundered into a ball boy on Court Two while a ball girl also felt the force of another Raonic rocket. "You don't feel good when that happens," said the 27-year-old Raonic, who was Wimbledon runner-up in 2016.

"Normally by the first reaction of the kid, you can sort of tell how they are, if it hurts, this kind of thing. There was one that hit the boy. The boy I think was okay. "There was one I hit a girl a little lower in the abdomen. I think she probably took a little bit more of a grunt than he did on that sense. I hope she's doing okay." The ball boys and girls, all drawn from local schools, are no strangers to the power of Raonic. Five years ago, a ball girl had to leave the court in tears after she was hit on the right arm by a 127mph (205km/h) serve during the Canadian's tie against Carlos Berlocq.