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Marcelo Arévalo González (Latin American Spanish: [maɾˈselo aˈɾeβalo ɣonˈsales]; born October 17, 1990) is a Salvadoran professional tennis player. He has been ranked as high as world No. 5 in doubles by the ATP, achieved on 14 November 2022. Together with his career-high singles ranking of world No. 139, attained in April 2018, Arévalo is the highest-ranked player, male or female, across both disciplines in Salvadoran tennis history.

He has won eight career ATP Tour doubles titles, including a Grand Slam title at the 2022 French Open with partner Jean-Julien Rojer. With the win, he became the first player from Central America to claim a men's doubles major title. He had previously reached one other Grand Slam final, having lost at the 2021 US Open in the mixed doubles tournament with partner Giuliana Olmos.

As a junior, Arévalo was ranked as high as No. 8 in the world and won seven singles and doubles titles on the ITF Junior Circuit.

As a professional, he emerged into the top 100 in 2018 and won his first ATP title at the 2018 Los Cabos Open, making his debut in the top 50. After several years with intermittent partners, Arévalo formed a new partnership with Rojer in 2022 that took them to four additional tour finals, three of which they won, and helped him debut in the top 10.

He is the younger brother of former tennis player Rafael Arévalo, who he often partnered with to represent El Salvador together in the Davis Cup.