Heat rules in tennis are written to protect the schedule

Extreme heat policies exist across the tours but they trigger late, apply unevenly, and put the burden on the player to continue.

A player is stumbling between points, the shirt has gone through three changes, and the discussion on air is about mental toughness. There is a heat policy. There usually is. It has probably not been triggered.

The measure most events use is a composite of temperature, humidity, radiant heat and air movement rather than the simple air temperature, which is the right instrument, because thirty five degrees in dry still air and thirty two degrees at ninety percent humidity are very different problems for a body trying to shed heat through sweat. Give the sport credit for that. The failure is in the thresholds and the response.

The thresholds sit high, and the standard response when one is crossed is an extended break between sets, which is help of a sort and does not change the fact that the player then walks back out into the same conditions. Suspension of play tends to require something close to the extreme, and the extreme is expensive, because a suspension pushes an entire order of play back, breaks the broadcast window, and strands ticket holders. There is a schedule pressing on every decision, and it presses in one direction.

Then there is the inconsistency. Men playing five sets and women playing three under the same threshold are not carrying the same exposure, courts with a closed roof and air handling are a different environment from an outside court in full sun, and a match on court eighteen at two in the afternoon gets far less scrutiny than the one on the main stadium. Policy applied per event rather than per match is not really protective.

The part I find least defensible is the culture around it. Continuing in dangerous heat is treated as a virtue and a story, and retiring is treated as a question about character. That framing makes the policy nearly irrelevant, because a player who is offered an extended break will often refuse the protection rather than look weak in front of a full stadium and an opponent.

Rules that depend on athletes protecting themselves in public do not work. They never have in any sport.

Take the decision away from them. That is the only version of a heat rule that means anything.