Andy Murray advanced into second round in straight sets at the U.S. Open, where 10th-seeded Victoria Azarenka collapsed on court in the sweltering Flushing Meadow heat on Wednesday.

Sam Querrey, the men's 20th seed from the United States, beat another American, Bradley Klahn. A third U.S. player, 220th-ranked qualifier Ryan Harrison, upset 15th-seeded Ivan Ljubicic of Croatia.

Murray beat Lukas Lacko of Slovakia on the Arthur Ashe Stadium court, winning 6-3, 6-2, 6-2. The number 4 seed from Britain is trying to capture his first Grand Slam title.

Murray had 37 winners in the match, 17 more than Lacko. He'll face Jamaicas Dustin Brown, who outlasted Spain's Ruben Ramirez Hidalgo in straight sets, 6-4 7-6 (8-6) 7-5, in the second round.

Andy Murray of Britain returns a ball to Lukas Lacko of Slovakia during the men's singles first round match at the U.S. Open tennis tournament in New York, the United States, on Sept. 1, 2010. Murray won 3-0.

Azarenka, from Belarus, collapsed on court in her match with Gisela Dulko of Argentina. Azarenka was trailing 5-1. She was taken off the court in a wheelchair and then by ambulance to a hospital for tests.

The British number one produced his full repertoire of shots as he wrapped things up in under two hours.

Murray must be delighted knowing the toughest player in his quarter, Tomas Berdych, has been eliminated.

Murray, who reached the US Open final in 2008, never looked in any danger as he comfortably saw off the threat of Lacko, who was making his tournament debut.

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