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Kirsty Young's castaway is the legendary tennis player, Martina Navratilova.

In an extraordinary career she's won 59 Grand Slam titles - her last just a few weeks short of her fiftieth birthday. Her life off the court has been equally eventful - she grew up in communist Czechoslovakia and, as a teenager, threw rocks as Soviet tanks rolled in; tennis offered a way to see the world and she defected to the US when she was 18 years old. After thirty years at the top of her profession she retired - and says she finally found time for the rest of her life: "Tennis really was a total commitment, you didn't have much time for anything else. So, when I quit, I was going through something emotionally that most people go through when they're 18, 20 years old. Really having the time for personal relationships, developing friendships and taking the time with everybody. I think I've caught up by now."

Producer: Leanne Buckle.