Nadal beats Djokovic, Serb suffers eye trouble

Spain's Rafael Nadal returns the ball to Serbia's Novak Djokovic in their singles match at the ATP World Tour Finals in London Nov 24, 2010.LONDON - World number one Rafa Nadal defeated Novak Djokovic 7-5 6-2 to close in on the semi-finals of the ATP World Tour Finals on Wednesday after his Serb opponent suffered eye trouble.What had been a high-quality Group A battle for more than an hour in