Emma Raducanu: The story of the teenage tennis superstar

Until July this year, most of us had never heard her name before - she was a Wimbledon wild card just after finishing her A-levels. Two months later, Emma Raducanu won the US Open women's singles title. <br /><br />In this episode, host Dermot Murghan speaks to US correspondent Martha Kelner about how Raducanu became an overnight sporting superstar and what the future holds for her.