Novak Djokovic and Rafael Nadal meet for the 58th time on Friday in the semi-finals of the French Open. AFP Sport looks at the numbers defining the rivalry which is now in its 15th year: Overall Djokovic leads 29-28 On clay Nadal leads 19-7 At French Open Nadal leads 7-1 At all Grand Slams Nadal leads 10-6 afp