Jannik Sinner, the world No.1, slipped from a near‑victory at Roland‑Garros after a scorching 32°C afternoon. The match, which should have capped a €2.8 million prize, ended with Sinner collecting only €130,000 as fatigue and heat took hold.

Players across the first week reported dizziness, cramps and a sense of exhaustion. Casper Ruud described himself as a “zombie” after 33°C conditions, while Jakub Menšík collapsed during a five‑set win. Physiologists say heat raises heart rate and sweat loss, eroding performance. Such conditions risk long‑term health impacts and could deter sponsors, reducing revenue streams for clubs and broadcasters.

The French Tennis Federation uses wet‑bulb globe temperature (WBGT) thresholds: a 10‑minute break at 30.1°C and a suspension at 32.2°C. This year’s heat never crossed 32.2°C, so no match was halted, exposing the urgency for unified standards.

ATP’s new heat rule, aligned with Grand Slam standards, aims to standardise responses, yet critics argue fragmented policies dilute effectiveness. Uniform, science‑based thresholds could protect players and preserve tournament integrity, ensuring competitors aren’t sidelined by climate shifts.