| Nadal, the world number one, breezed through 
				the first set without facing a break point but the 36-year-old 
				Ferrer fought back in the second, breaking Nadal twice before 
				the injury forced him to stop with the score at 6-3 3-4.
 Ferrer, whose decision to retire brings the curtain down on his 
				final appearance at a Grand Slam, said he had taken an injection 
				before the match but was in obvious discomfort and need 
				treatment courtside before he decided to quit.
 
 "I feel bad," he said in a courtside interview. "I had one shot 
				in my calf and there was pain. I tried to play. I tried.
 
 "I'm so sorry because I can't finish the match, but anyway, 
				thanks a lot."
 
 Nadal, who like his opponent was sweating profusely in the 
				oppressively humid conditions, paid tribute to Ferrer, whom he 
				beat in the 2013 French Open final.
 
 "I'm very sorry for him. He's one of my closest friends on the 
				tour and we faced many amazing moments together," Nadal said. 
				"It's sad for him to finish like this."
 
 (Reporting by Simon Jennings, editing by Nick Mulvenney)
 
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