Sue Barker was just 15 when she was sent to a junior tennis championship in France alone, told she had to win the money to pay for her return fare; five years later she was Britain’s number one tennis player. The grit and determination she applied to her tennis has also been seen in her long-running broadcasting career, during which she’s interviewed some of the world’s top sporting legends. Barker has now turned the focus on herself in her memoir Calling the Shots. In conversation with BBC Sport and CNN reporter Phil Jones, she talks about her hard-won success in tennis and broadcasting, relives some of the nation's biggest sporting dramas and gives us an understanding of her trailblazing career.