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			 Djokovic was made to work for his 7-6(3) 7-5 6-0 win over world 
			number 65 Dolgopolov. 
			 
			After dropping the first set the top-seeded Serbian found himself in 
			even deeper trouble by falling behind 4-1 in the second and facing 
			the threat of an unexpected early exit. 
			 
			But Djokovic dug deep to turn things around, breaking to get the set 
			back on serve at 4-3 to the Ukrainian and then broke again for a 6-5 
			lead. 
			 
			Having seen his chance of an upset slip through his hands, 
			Dolgopolov faded quickly and badly dropped the third set where a 
			dominant Djokovic won 24 of 27 points. 
			 
			"I was literally a game or two from losing the match. I'm just happy 
			to be able to bounce back," said Djokovic. 
			  
			
			  
			 
			"These particular matches do help me in a certain way mentally to 
			gain that confidence and self belief in a way that I never give up 
			and battle till the last point, and it sends a message to the other 
			players, as well," he added. 
			 
			Djokovic, who is seeking a fifth title at Key Biscayne, will face 
			Spaniard David Ferrer in the quarters. 
			 
			World number four Murray beat South African Kevin Anderson 6-4 3-6 
			6-3 to become the 46th man in the Open Era to reach 500 career wins 
			and the first British male. He is one of only nine active players to 
			have reached the milestone. 
			 
			Anderson fought back well in the second but after trading early 
			breaks in the third the Scot took control breaking his South African 
			opponent again to grab a 3-1 advantage and never looked back. 
			 
			Murray will face Austrian Dominic Thiem, who reached his first 
			Masters 1000 series quarter-final after beating France's Adrian 
			Mannarino 7-6(5) 4-6 7-5. 
			 
			
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			Czech Tomas Berdych made it six quarter-finals out of six 
			tournaments this year after he advanced when Frenchman Gael Monfils 
			retired in the second set after a bad fall. Berdych was leading 6-3 
			3-2. 
			
			Berdych will next face Argentine Juan Monaco, a 6-3 6-3 winner over 
			Spaniard Fernando Verdasco. 
			 
			Japan's Kei Nishikori, the fourth seed, beat Belgian David Goffin 
			6-1 6-2 and will face American John Isner, who beat Canada's Milos 
			Raonic in three tie-breaks. 
			 
			Isner trailed by a set and was 3-0 down in the second but emerged 
			from the battle of two of the game's biggest servers with a 6-7(3) 
			7-6(6) 7-6(5) victory. 
			 
			(Editing by Frank Pingue/Greg Stutchbury) 
			
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