The Unstoppable Sharapova?

Maria Sharapova burst on to the world tennis stage after winning Wimbledon at the age of 17 in 2004. She went on to become the world's highest paid female-athlete and won another 4 Grand Slams. But in 2016 her career came crashing to a halt when she was given a 15 month ban from tennis for doping. Having served that ban - Sharapova is back on the tennis circuit. In a BBC News special Laura Trevelyan speaks to the tennis star about her career, and route back to redemption.