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. 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.