Sebastián Prieto (Spanish pronunciation: [seβasˈtjam ˈpɾjeto];[a] born 19 May 1975) is an Argentine former professional tennis player.

Primarily a doubles specialist, Prieto has won ten doubles titles in his career.

He began playing for the Argentina Davis Cup team in 1999.

Prieto coached Juan Martín del Potro from 2017 to 2020.

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