Juan Martin Del Potro edged top seed Andy Roddick to successfully defend his Legg Mason Classic title in Washington with a 3-6 7-5 7-6 victory in Sunday’s final. The Argentine produced five aces in the deciding tiebreaker which he took on his fourth match-point when the Hawk-Eye review system upheld a forehand winner. “I did my best services ever in my life,” Del Potro told the official ATP Tour Web site www.atpworldtour.com after making 19 aces in the grueling two and a half hour match