Del Potro defeats Stepanek;
Del Potro, who was told by doctors not to play with the inflamed left wrist, defeated Stepanek 6-4, 6-4, 6-2 in the opening match of the series and then broke down crying afterward as he addressed cheering fans at the outdoor clay-court venue.
Juan Martin del Potro won his fourth straight tournament Sunday, beating Viktor Troicki 6-3, 6-3 to take the Legg Mason Tennis Classic championship.