Australian Open champion Caroline Wozniacki beat Australian Sam Stosur 6-3 6-2 in hot conditions to reach the second round of the US Open.
Second seed Wozniacki, 28, broke the 2011 champion’s serve five times on a day when temperatures in New York are expected to top 32C with high humidity.
The Dane plays Lesia Tsurenko next.
Organisers implemented the extreme heat policy at Flushing Meadows with a 10-minute break between the second and third sets in women’s singles matches.
There will be a 10-minute break between the third and fourth sets of men’s singles matches.
Two-time Wimbledon champion Petra Kvitova is also into the second round after beating Belgian Yanina Wickmayer 6-1 6-4.
The Czech fifth seed, 28, broke serve twice to take the first set and won five successive games from 4-1 down in the second. She will face China’s Yafan Wang next.
Two-time US Open runner-up Wozniacki said: “I’m just glad to have won this one. It’s definitely difficult. It’s very hot out here. I just tried to cool down between games.”
American 24th seed Coco Vandeweghe, a semi-finalist at Flushing Meadows last year, was knocked out in the first round by Belgian Kirsten Flipkens, 6-3 7-6 (7-3).
Latvian 10th seed Jelena Ostapenko, the 2017 French Open champion, beat Germany’s Andrea Petkovic 6-4 4-6 7-5 to set up a second-round meeting with American Taylor Townsend.
Japan’s Naomi Osaka, seeded 20th, defeated German Laura Siegemund 6-3 6-2 and will play Romani’s Monica Niculescu or Israel’s Julia Glushko next.
Wimbledon champion and fourth seed Angelique Kerber will face Russia’s Margarita Gasparyan on Louis Armstrong.
Top seed Simona Halep was knocked out in the first round on Monday.
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