Overview

• Jannik Sinner stopped at 3-2 in the third set against Tallon Griekspoor after 2 hours 36 minutes, retiring with severe leg cramps at the Rolex Shanghai Masters.
• Under ATP rules cramps are not treated as an in‑play injury, so no standard medical timeout was permitted before he ended the match.
• Players and commentators condemned the extreme heat and humidity in Shanghai, with Holger Rune publicly urging a formal heat rule as others reported illness or retirements.
• As defending champion Sinner loses 950 ranking points and now trails Carlos Alcaraz by about 1,340, making an immediate return to No. 1 unlikely although still mathematically possible.
• Sinner plans a week of rest, an exhibition at the Six Kings Slam in Riyadh (Oct 15–18), then Vienna, the Paris Masters and the ATP Finals; Griekspoor advances to face Valentin Vacherot in the last 16.