NEW YORK (Reuters) - World number one Rafa Nadal knew powerhouse Juan Martin del Potro's biggest weakness was his shaky backhand, and the Spaniard exploited the vulnerability repeatedly at their U.S.

The nickname "DELPO" was printed in block letters on the back of Juan Martin del Potro's white Nike shoes, and it didn't take long for him to brand command on the match today. Navigating some slippery ...