Five-time Grand Slam champion Maria Sharapova picks greatest player of all time

Maria Sharapova, five-time Grand Slam champion and former World No. 1, has weighed on the "greatest of all time" debate, choosing one of her biggest rivals.

• Former World No.1 and six-time Grand Slam champion, involved in first fatal accident in tennis history
• She won 8 Grand Slams by 19, could have been the greatest ever but a brutal attack changed her life