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				 Since returning from a six-month hiatus in 
				January, the 36-year-old Swiss has been in stupendous form as he 
				has won five titles, including the Australian Open and 
				Wimbledon. 
				 
				"At the moment we're just assuming that Roger is going to pull 
				the rabbit out of the hat again," four-times U.S. Open champion 
				McEnroe said during an ESPN conference call on Wednesday. 
				 
				"If Roger wins this, it will be one of the great stories in that 
				last 50 years or ever." 
				 
				"I saw him today and I said, 'I've got to tell you, hats off. 
				I've watched tennis for 40 or 50 years and I've never seen 
				anything like this'." 
				 
				Chris Evert, the winner of 18 grand slam titles, said she was 
				equally mesmerized by what Federer has done this year. 
				 
				"He came back and it was ridiculous," she said. "It was like he 
				was a different person. It was like his clone has come back," 
				she said. 
				 
				One question mark hanging over Federer is his health. 
				 
				Back pain appeared to limit his mobility during the Rogers Cup 
				final in Montreal earlier this month, where he fell in straight 
				sets to 20-year-old German Alexander Zverev. 
				 
				It was only the third time Federer had lost a match this year 
				and as a result the 19-times grand slam champion opted to skip 
				the Cincinnati Masters to tend to the injury. 
				 
				"I was sitting on the court in Montreal when he tweaked his 
				lower back and it was really evident that something was wrong 
				with him," Evert said. 
				 
				"You never know, he doesn't say much about his injuries and he 
				made no excuses after the match, but hopefully he's healthy." 
				 
				Federer will need to be at 100 percent to compete at Flushing 
				Meadows in the grueling best-of-five-set tournament, where 
				scorching heat and suffocating humidity are the norm. 
				 
				Apart from Federer, world number one Rafael Nadal and Briton 
				Andy Murray, who is coming back from a hip injury that forced 
				him to skip all the hardcourt tournaments in the run up to the 
				Open, are the names in the mix as potential winners of the final 
				major of the season. 
				 
				If those favorites falter, the tournament is up for grabs, 
				McEnroe said. 
				 
				"It wouldn't be shocking considering that Roger is 36 and he's 
				had two majors already so perhaps things don't go as smoothly as 
				they did the other times. And let's say Nadal wasn't around and 
				Murray wasn't healthy, then it's like, who is going to do it?" 
				 
				"That's where it really gets open," he said. 
				 
				(Reporting by Rory Carroll, editing by Pritha Sarkar) 
			[© 2017 Thomson Reuters. All rights 
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