British number one Andy Murray eased through to the second round of the US Open by seeing off Lukas Lacko in straight sets.
Murray was only troubled by the heat in New York, seeing off Lacko 6-3, 6-2, 6-2 in less than two hours.
Afterwards, the world number four said: "I managed to get through in straight sets so I'm pleased, but it was a lot tougher than the score suggests.
"It wasn't necessarily the best tennis, but the conditions were tricky out there. It was very windy on the court.
"It was a guy I've never played against on the tour. I haven't really seen much of him play, so it took a little time to get used to his game.
"But I did enough to win in straight sets and that was the most important thing.
"You'd rather win as quickly as possible in any condition, whether it's cold or hot, in the slams, but the only important thing is to win the match.
"If it's in five sets it's not ideal, but you just want to try to win."
Next up for Murray is Jamaica's Dustin Brown, who beat Ruben Ramirez Hidalgo 6-4, 7-6, 7-5.