Nicolás Alejandro Massú Fried (; born 10 October 1979), nicknamed El Vampiro (Spanish, 'the vampire'), is a Chilean former professional tennis player and a coach. A former world No. 9 in singles, he won the singles and doubles gold medals at the 2004 Athens Olympics. He is the only man to have won both gold medals at the same Games since the re-introduction of Olympic tennis in 1988, and they are Chile's only two Olympic gold medals. Massú also reached the final of the 2003 Madrid Masters and won six singles titles. He was the coach of 2020 US Open champion and former world No. 3 Dominic Thiem from 2019 to 2023. Wikipedia
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