On 6 August, she competed against Valentina Moscatt of Australia in the women's extra-lightweight category –48 kg. In the four-minute match, neither of the judokas could score a point. Tú, who has fewer penalty points ("shido") than Moscatt, was then announced as the winner by the referee. It was the first time a Vietnamese judoka has won a match at the Olympics. That same day, Tú was eliminated from the quarterfinal after losing in the match against South Korea's Jeong Bo-kyeong, who scored 102 points. After the Games, Tú earned a prize and a certificate by the Ministry of National Defense for her result as an military athlete. At the ceremony, she announced that it was her last time competing at the Olympics, saying "It was the most significant milestone of my career. An Olympic victory in Rio de Janeiro is what I wish for the most and it came true."