Jannik Sinner’s defence of his Rolex Shanghai Masters title ended in unfortunate fashion on Sunday evening. He was forced to retire during the deciding set of his third-round match against Tallon Griekspoor. Griekspoor led 6-7(3), 7-5, 3-2 when Sinner, ranked No. 2 in the ATP standings, stopped playing in the humid Shanghai conditions. The Italian […]