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Players and spectators in this week's Miami Open would be expected to have temperatures reach 80 degrees, which could be uncomfortable for everyone involved. Extreme temperatures often affect the players' performance levels, particularly when they play in the middle of the day when the sun is at its hottest.
Officials, umpires, and ball kids may also see their performance levels dip due to heat. Audience numbers might also be adversely affected, as fans stay away from matches rather than succumb to sunburn and dehydration. To combat the heat, organizers have developed an Extreme Heat Policy (EHP), which is in effect in Miami.
The EHP was adopted in 2019 and involves the adoption of a Heat Stress Scale (HSS) to protect players, officials, and spectators. The HSS weighs four heat factors: radiant heat or sun strength, humidity, wind speed, and air temperature. Measurements are taken from different areas of Hard Rock Stadium.
The measurements are used to indicate the suitability of playing conditions and impose five playability levels:
1 - Temperate playing conditions
2 - Increase hydration
3 - Apply cooling strategies
4 - Extended breaks
5 - Suspension of play
Decisions are made before matches begin about heat strategies for that match, but may be reviewed during the game itself. Spectators are advised by the umpire of any escalation in levels, and it is the tournament referee's job to examine the possible consequences of applying the HSS.
Matches at the Miami Open can be suspended during the game
TENNIS: MAR 26 FL: Rafael Nadal Calls It Quits Down 3-0 In Final Set Vs. Damir Dzumhur - Source: Getty" srcset="https://staticg.sportskeeda.com/editor/2025/03/0247a-17425489416851-1920.jpg?w=190 190w, https://staticg.sportskeeda.com/editor/2025/03/0247a-17425489416851-1920.jpg?w=720 720w, https://staticg.sportskeeda.com/editor/2025/03/0247a-17425489416851-1920.jpg?w=640 640w, https://staticg.sportskeeda.com/editor/2025/03/0247a-17425489416851-1920.jpg?w=1045 1045w, https://staticg.sportskeeda.com/editor/2025/03/0247a-17425489416851-1920.jpg?w=1200 1200w, https://staticg.sportskeeda.com/editor/2025/03/0247a-17425489416851-1920.jpg?w=1460 1460w, https://staticg.sportskeeda.com/editor/2025/03/0247a-17425489416851-1920.jpg?w=1600 1600w, https://staticg.sportskeeda.com/editor/2025/03/0247a-17425489416851-1920.jpg 1920w">
TENNIS: MAR 26 FL: Rafael Nadal Calls It Quits Down 3-0 In Final Set Vs. Damir Dzumhur - Source: Getty
If the HSS hits 4, the tournament referee imposes a 10-minute break between the second and third sets for women and junior matches, and between the third and fourth sets for men. If the HSS reaches 5, the referee may suspend the start of play on all outside courts, and matches in progress will stop after an even number of games or a tie-break is concluded.
The most famous victim of the Miami heat was Rafael Nadal, who retired from his first-round match at the Miami Open in the third set against Damir Dzumhur in 2016. Nadal cited heat exhaustion as the reason for his retirement.
Last week's Indian Wells champion, Jack Draper, also retired from the 2021 tournament in the first round blaming the famous Florida heat and humidity.
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Edited by Hitesh Nigam