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In the 2020 Tokyo Olympics, Elise Mertens participated in two badminton events: singles and doubles. She advanced to the third round of the women's singles tournament before being eliminated by eventual bronze medalist He Bingjiao. In the women's doubles competition, Mertens and her partner, Ann Vanlangenhove, reached the quarterfinals, where they were defeated by the eventual gold medalists, Chen Qingchen and Jia Yifan.