In August, del Potro won his third consecutive title at the Countrywide Classic in Los Angeles, beating Andy Roddick in straight sets in the final. After the match, Roddick praised his opponent. "Potro hits this way and this way kind of equally and he can hit it from inside out and running to it, which is a good thing for him, bad for the rest of us". A fourth consecutive title followed a week later in the Legg Mason Tennis Classic in Washington, D.C., where he recorded a victory over Viktor Troicki, becoming the first player in ATP history to win his first four career titles in as many tournaments. "I don't really understand what I did. It is difficult to believe that I have won four consecutive titles", del Potro said, crediting coach Franco Davín for his impressive run. "He changed my game. He changed my mind. He changed everything. When I play and I see him in the stands, it gives me confidence. I can play relaxed."