This is the reason why Jannik Sinner has withdrawn from Shanghai

The extreme heat and humidity prevailing in Shanghai these days are wreaking havoc on all the tennis players in the draw. Over the past few days, many have struggled to play, including Jannik Sinner. After failing to close the match in two sets against Griekspoor, leading to a third set, the Italian started experiencing cramps in his right leg to the extent that he was forced to retire mid-set. Jannik could barely move and had to be assisted by the ATP physiotherapist to walk due to his issues. A setback for Sinner who was defending the title in Shanghai.

This is an automatic translation. You can read the original news, Este es el motivo por el que Jannik Sinner se ha retirado de Shanghai