US Open: Rafael Nadal played very smart from the 2nd set, says Del Potro

Juan Martin del Potro says Rafael Nadal stepped up his game after the first set during their US Open men's singles semifinal on Friday. Nadal beat Del Potro 4-6, 6-0, 6-3, 6-2 to enter the final. “Nothing special happens,” said Del Potro. “Rafa just play even better the last three sets of the match, and I couldn't hit my backhand as good as I did in the beginning of the match.” (Video Credit: SNTV)