Argentina’s Juan Martin Del Potro has told CNN that beating world number one Roger Federer to win the men’s U.S. Open title at Flushing Meadows was a “dream come true.” The 20-year-old upset the odds to clinch a 3-6 7-6 (7-5) 4-6 7-6 (7-4) 6-2 win in New York, a victory that brought an end to his Swiss opponent’s five-year stranglehold on the event.