Andy Murray said that he was far happier with conditions after his win against Thomaz Bellucci in the US Open third round on Saturday night.
The Scot beat Bellucci in straight sets 6-3, 6-2, 7-5 to reach the second week at the US Open.
In a chat with media afterwards, Murray said that conditions played a big role in his performance especially after his five-set marathon win over Adrian Mannarino in the second round.
"The conditions were so much nicer to play in today," Murray said.
"After long rallies and stuff, you weren't really struggling for breath as much. The conditions in the first two rounds, it really doesn't get harder than that.
“These conditions are the toughest to play in during the year and to get through those two matches especially the second one was important."
Murray confirmed that he did request to play later in order to recover from his cold and tiredness after the match against Mannarino.
"I asked to play later. I didn't ask to play as late as possible. I just asked if I could play slightly later rather than first or second."
The third seed said that he felt he played well against Bellucci.
"I played well as it's easier to control the ball in these conditions. The ball was flatter and not bouncing that high.
“It was harder to serve as the conditions were slower to serve in.
“The speed of the serve was a bit lower and the ace count was less too," he added.