![comscore Tennis logo Live Scores News Tournaments Players & Rankings Baseline Tickets Search Login Edit Profile Logout Live Scores News Tournaments Players & Rankings Baseline Tickets FORGE GO Advertising 6302 Results All video story album ... comscore Tennis logo Live Scores News Tournaments Players & Rankings Baseline Tickets Search Login Edit Profile Logout Live Scores News Tournaments Players & Rankings Baseline Tickets FORGE GO Advertising 6302 Results All video story album ...](https://images.tennis.com/image/private/t_1-1_768/f_auto/tenniscom-prd/oxju3btzeavduozuw63s.jpg)
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![TENNIS a Twitter: "Wawrinka questions difference in heat rule for male and female players. From @Kamakshi_Tandon: http://t.co/sH7VbKXRYr http://t.co/wszNYufFuO" TENNIS a Twitter: "Wawrinka questions difference in heat rule for male and female players. From @Kamakshi_Tandon: http://t.co/sH7VbKXRYr http://t.co/wszNYufFuO"](https://pbs.twimg.com/media/COESU2cXAAARr71.jpg)
TENNIS a Twitter: "Wawrinka questions difference in heat rule for male and female players. From @Kamakshi_Tandon: http://t.co/sH7VbKXRYr http://t.co/wszNYufFuO"
![Live Tennis on Twitter: "'The heat rule is in effect,' the umpire tells Caroline #Wozniacki & Sam #Stosur as they take the court for their R1 match on Arthur Ashe. https://t.co/x9T14A80AL" / Live Tennis on Twitter: "'The heat rule is in effect,' the umpire tells Caroline #Wozniacki & Sam #Stosur as they take the court for their R1 match on Arthur Ashe. https://t.co/x9T14A80AL" /](https://pbs.twimg.com/media/DlsvSMwXgAIA0px.jpg)
Live Tennis on Twitter: "'The heat rule is in effect,' the umpire tells Caroline #Wozniacki & Sam #Stosur as they take the court for their R1 match on Arthur Ashe. https://t.co/x9T14A80AL" /
![US Open Extreme Heat rule: What is it? Why has it been enforced? What can the players do? | Tennis | Sport | Express.co.uk US Open Extreme Heat rule: What is it? Why has it been enforced? What can the players do? | Tennis | Sport | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/72/590x/Novak-Djokovic-1010327.jpg?r=1536256703804)
US Open Extreme Heat rule: What is it? Why has it been enforced? What can the players do? | Tennis | Sport | Express.co.uk
![Nick Kyrgios hits out at US Open organisers for lack of heat rule as hotter temperatures on the way in New York | The Independent | The Independent Nick Kyrgios hits out at US Open organisers for lack of heat rule as hotter temperatures on the way in New York | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2018/08/28/17/Petra-Kvitova-0.jpg?quality=75&width=640&height=614&fit=bounds&format=pjpg&crop=16%3A9%2Coffset-y0.5&auto=webp)
Nick Kyrgios hits out at US Open organisers for lack of heat rule as hotter temperatures on the way in New York | The Independent | The Independent
Australian Open introduces new heat stress scale, allowing 10-minute breaks in men's matches - ABC News
![Nick Kyrgios hits out at US Open organisers for lack of heat rule as hotter temperatures on the way in New York | The Independent | The Independent Nick Kyrgios hits out at US Open organisers for lack of heat rule as hotter temperatures on the way in New York | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2018/08/29/07/nick-kyrgios.jpg?quality=75&width=1200&auto=webp)