The story was different in Athens, where Massú captured both singles and doubles titles. On August 21, he and Fernando González defeated Nicolas Kiefer and Rainer Schüttler of Germany to win the doubles competition, making history by giving Chile its first ever Olympic gold medal in any sport, after nearly a full century of Olympic participation. Massú and González came from four straight match points in the fourth set tie-break to claim the gold. The following day, he captured his second gold medal by defeating American Mardy Fish in five sets in the men's singles final. Following his victory in singles, he was declared as "Athlete of the Day" by the 2004 Athens Olympics' organization.