New Delhi, Oct. 6 -- 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 seemed to suffer from cramps in his right thigh, which began late in the second set.

Jannik Sinner tried using ice towels and stretching but continued to limp between points. At the 2-1 changeover, he rested his legs on the bench to ease the pain.

According to holiday-weather.com, the average temperature in Shanghai in October is 19 degrees Celsius. However, on October 5,...