British tennis player Heather Watson says she has received social media abuse "daily" during her career and had her first death threat aged 18. Watson was speaking after compatriot Katie Boulter told BBC Sport about the scale of unsavoury and hurtful comments she has received online, including death threats. And Sir Andy Murray has said he is trying to keep his children away from social media and backed calls for more action to prevent abuse of sport stars. "My first death threat was at 18," Watson told BBC Sport at a Wimbledon media event on Friday. "I told my friend [American tennis player] Sloane Stephens at the time.