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			 Federer, who reigned supreme at Flushing Meadows with five 
			consecutive titles from 2004, won the Cincinnati title last week on 
			the back of reaching the final in Toronto and with world No.2 Rafa 
			Nadal injured, many believe the 33-year-old Swiss maestro can claim 
			an 18th grand slam title. 
 "Obviously not having to deal with (Nadal) is a huge positive for 
			him potentially down the road if he's at a stage at the end of the 
			event," McEnroe said in a conference call with TV channel ESPN for 
			whom he will be working as a commentator during the year's final 
			grand slam.
 
 "I would give a slight, slight favorite to Djokovic based on it 
			being best-of-five. He's younger and he can go the distance perhaps 
			a little bit more easily than Roger at this stage. A little bit.
 
 "Depending on what happens leading up to it if they were to play in 
			the final, some of it would have to do with how much was left in the 
			tank from previous matches."
 
 
			 
			Djokovic beat Federer in an epic Wimbledon final but the 
			27-year-old, who has just married long-time girlfriend Jelena 
			Ristic, lost early in Toronto and Cincinnati and McEnroe believes 
			the Serb has lost focus.
 
 "I don't think Novak's mind has been into it since - it was one of 
			the greatest matches I ever saw at Wimbledon," he said. "He got 
			married. I didn't see a lot of his matches since, but I saw a few. I 
			think it was difficult for him to get back into the swing of things. 
			I believe he'll be ready here."
 
 It is no foregone conclusion that Djokovic and Federer will contest 
			the final, though.
 
 McEnroe believes Briton Andy Murray, the 2012 champion, can use the 
			U.S. Open to spark a long-awaited return to form, while he also tips 
			Canada's Milos Raonic and Bulgarian Grigor Dimitrov to make strong 
			runs on the New York cement.
 
 Murray has not won a title since Wimbledon last year and has slipped 
			to ninth in the world rankings, although he will be seeded eight in 
			New York because of Nadal's wrist injury.
 
 "I think that if you look at it, he's not that far away," McEnroe, a 
			four-times U.S. Open champion, said.
 
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		 "It depends if you only look at the glass half empty or half 
			full, and people do both. But given the fact that he had a surgery 
			on his back, which is pretty serious, if you look at his results at 
			the majors, he wasn't that far off.
 "He's putting himself in the position slowly but surely. To me, he's 
			the third favorite to win this tournament. Depending on how the draw 
			pans out, you would absolutely anticipate that he's going to be a 
			factor in this event."
 
 However, Australian Open champion Stanislas Wawrinka is struggling 
			to back up his breakthrough moment and despite being seeded three, 
			McEnroe is not expecting the Swiss to win a second grand slam of the 
			year.
 
 "He hasn't been the same since," McEnroe said. "He doesn't seem to 
			be able to handle the attention in a way."
 
 Federer will be playing his 60th consecutive grand slam at the U.S. 
			Open - a feat McEnroe labels heroic.
 
 "It's obviously remarkable and unbelievable that he's been able to 
			do this consistently well for this long," said the American. "To do 
			that, 60 majors in a row, is heroic in a way. It should not be 
			underestimated or under-appreciated by tennis fans."
 
			
			 (Reporting by Martyn Herman in London. Editing by Patrick Johnston) 
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