Overview
- The rules take effect for ATP Tour best‑of‑three events in 2026, while the four Grand Slams continue under their own heat protocols.
- A 10‑minute cooling break can be requested between the second and third sets if WBGT readings exceeded 30.1°C during the first two sets, with showers, clothing changes, hydration, coaching and medical checks permitted.
- Outdoor play will be suspended when WBGT reaches or exceeds 32.2°C for more than 15 minutes, stopping at the end of the current game or tie‑break and resuming only after 20 minutes below 30.5°C.
- Events with retractable roofs must close them when WBGT hits 32°C or the court surface reaches 45°C, and matches will then be completed indoors.
- For doubles, players receive an extra 90 seconds for hydration at WBGT of 31°C or higher, and the tour plans to monitor implementation during the Australian summer.