Nicolás Alejandro Massú Fried (Spanish pronunciation: [niko'laz ma'su]; born 10 October 1979), nicknamed El Vampiro (Spanish: "the vampire"), is a Chilean retired tennis player, a former world No.
9 in singles and winner of two Olympic gold medals.
He is the only male player to have won both the singles and doubles gold medals during the same games in modern Olympic tennis (since 1988), the only two gold medals Chile has won at the Olympics.
Massú also reached the final of the 2003 Madrid Masters and won six singles titles.