Take cover! Big servers pose big risk to ball kids

LONDON - 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 150 miles per hour, you'd better take cover.

The giant Canadian cranked up the fastest serve of the tournament on Wednesday with a 147 mph (236.5 km/h) howitzer in a victory over John Millman in the second round.

Raonic 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.