When tennis fans from Arizona say it is hot at the Wimbledon championships, then it must be.
"It's hot and I'm the only guy in jeans," said Cesar Ponce, 30, from Tucson who with his wife Melissa had queued from about 6 a.m. for four hours to buy ground passes.
Wednesday was the hottest day so far at the grasscourt tournament which started on Monday, with the thermometer hitting just over 34 degrees Celsius (93 Fahrenheit) at 11 a.m., then cooling down marginally in the afternoon, according to Britain's Met Office.
Australian Bernard Tomic, the 27th seed, needed treatment after toiling under the blazing sun during his second-round match.
"I was very dizzy out there. I didn't sleep well yesterday and the day before. I was fatigued and starting to get dizzy out there with the heat hitting me," he told reporters.
Women's fourth seed Maria Sharapova, however, was unconcerned.
"It's much much warmer in my hometown in Longboat Key, Florida," the Russian told reporters.
"Just being a little bit smarter out there is important."
Toni Nadal, uncle and coach of twice champion Rafa Nadal, said the heat was not a major issue for the players.
"It's really hot but it's not a big problem," Toni Nadal said. "The key is playing tennis and not thinking about it."
But if the players are not falling over, some spectators are suffering and a ballboy had to be wheeled off Court 17 after collapsing during a match.
The St. John Ambulance charity which handles emergency calls at Wimbledon said it had treated 96 people on Monday and 173 on Tuesday.
Most of those were for complaints of feeling faint or suffering from slight dehydration and headaches, the charity's press officer Bijal Patel said.
"We are really busy on the ground and they just have to prioritise treating people," she said.
"There's been a lot of kind of awareness-raising of what people should be doing but I don't know if people are going to take that advice," she added.
To judge from the large number of umbrellas used as shades and people slathering themselves with sunscreen and wearing hats, the message was getting through.
Luke Resch, 22, had managed to make three sailor-style sunhats out of a broadsheet newspaper.
"We used our origami," he said. "And we got our hats for the price of a paper."
His red-haired friend Simon Williams gave his backing to the effectiveness of the makeshift headgear.
"I'm a ginger and I'm not dead yet so that's all right," he said. "I'm still here, I'm not a lobster."
UN warns of hot weather risks
The United Nations earlier warned of the dangers posed by hot weather, especially to children and the elderly, as much of Europe sweltered in a heatwave whose intensity it blamed on climate change.
Authorities should give people as much warning as possible of potentially dangerous high temperatures so that they take can precautions, the World Meteorological Organization and the World Health Organization said.
It also reminded people to drink plenty of water.
Tens of thousands of people died across Europe in a 2003 heatwave and again in Russia in 2010.
Separately, AccuWeather said that while extreme heat has already built up across Spain and Portugal, hot conditions will expand across Europe this week. In Paris, temperatures are expected to peak on Wednesday near 38 Celsius (100 Fahrenheit).
Young children, the elderly and people working outside were most vulnerable to the effects, which range from heat rash to cramps, exhaustion, dehydration, heatstroke and death, the U.N. guidance said, urging people to take precautions.
"These range from simple actions at the personal level, such as ensuring sufficient indoor ventilation or liquid intake to the initiation of community-based 'buddy' systems and transport of the vulnerable to dedicated cooling centres."
Heatwaves are becoming more frequent and intense as a result of climate change, the U.N. said. Cities particularly were heating up as buildings trapped hot air.
"So when you look at the pattern here in Europe in the last 10 or 15 years - 2003, 2010 and 2015 - we're seeing temperatures that set records," Maxx Dilley, WMO climate expert, told Reuters.
"So it's quite unusual to see so many hot episodes so close, so frequently and occuring so close to each other," he said.
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