Juan Martín del Potro (born 23 September 1988), often nicknamed Delpo, is an Argentine professional tennis player. His biggest achievement was winning the 2009 US Open, defeating Rafael Nadal in the semifinal and Roger Federer in the final (the first time both lost to the same player at a Grand Slam tournament). This title earned him the distinction of being the only man outside the Big Four to win a Grand Slam between the 2005 French Open and the 2013 US Open, a span of 35 tournaments. He is also the second Argentine and the fifth-youngest man to win the US Open title in the Open Era. His other career highlight was winning the bronze medal in men's singles at the London Olympics in 2012.