| The Serb, who was also pushed to four sets in 
				punishing daytime temperatures above 90 Fahrenheit (32C) in the 
				first round, was far more comfortable in the evening at the 
				Arthur Ashe Stadium, breaking early and running away with the 
				opening set in 31 minutes.
 The 31-year-old was two sets up and leading by a break in the 
				third when he spurned a match point, allowing Sandgren to force 
				a tiebreak that the American won easily.
 
 Djokovic, however, recovered well, achieved an early break in 
				the fourth set and closed out the match in two hours, 45 
				minutes.
 
 "I thought I played really well in the first two sets and then I 
				lost it mentally," Djokovic said courtside. "I lost my composure 
				and concentration but I got it back in the fourth."
 
 Djokovic also spoke about the noise from the crowd both between 
				and during points but said it had not been a factor in him 
				losing concentration.
 
 "I was just referring to the atmosphere that the night session 
				at the U.S. Open has," the sixth seed told reporters.
 
 "I've played many times here. It has no connection to my loss of 
				concentration. It was just me, being me sometimes, the other me 
				that my first me doesn't like.
 
 "You just have to accept it. You can't expect that 23,000 people 
				are quiet... Wimbledon is all white, it's tradition. You can't 
				hear a sound when you play a point. Here it's different. That's 
				why these majors are unique in their own way."
 
 The Serb, who won Wimbledon this year, will face 26th seed 
				Richard Gasquet of France in the third round.
 
 (Reporting by Simon Jennings; Editing by Greg Stutchbury/Peter 
				Rutherford)
 
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