Del Potro began playing tennis at the age of seven with coach Marcelo Gómez (who also coached Tandil-born players Juan Mónaco, Mariano Zabaleta and Máximo González). Del Potro's talent was discovered by Italian ex-tennis professional Ugo Colombini, who accompanied him through the initial phases of his young career, and is still today his agent and close friend. When questioned about his ambitions in tennis he replied, "I dream of winning a Grand Slam and the Davis Cup." Despite refusing to participate in the Davis Cup several times, he has since achieved both goals. He is a Roman Catholic.