Jannik Sinner was forced to retire from his third-round match at the Shanghai Masters against Tallon Griekspoor, the 27th seed, after suffering from cramps in humid conditions while trailing the Dutchman 6-7 (3), 7-5, 3-2.
In the final weeks of a long, arduous season for all, the conditions in Shanghai have been severe this past week, particularly on Sunday as players tried to compete in 90% humidity. Many struggled badly.
