Last updated on 2 hours ago2 hours ago.From the section Tennis.

American teenage tennis star Coco Gauff can help "change the world for the better"," says 18-time Grand Slam champion Martina Navratilova.

The 16-year-old has repeatedly spoken to demand social change following the death of George Floyd.

"Tennis has had its share of obstacles, but I think overall, we've been at the forefront of social change and it seems like now with Coco Gauff, leading the charge, we're still there.".

Meanwhile, Navratilova says tennis needs to "play it safe" after several players revealed they had coronavirus after playing at Novak Djokovic's Adria Tour competition.

Analysis and opinion from the BBC's tennis correspondent