Jannik Sinner forced to retire in Shanghai; Novak Djokovic advances
World No. 2 Jannik Sinner had to be helped off the court in the third set at the Rolex Shanghai Masters, with severe cramping in his right thigh forciWorld No. 2 Jannik Sinner had to be helped off the court in the third set at the Rolex Shanghai Masters, with severe cramping in his right thigh forci