The 2018 Copa Sudamericana finals was the two-legged final to decide the winner of the 2018 Copa Sudamericana, the 17th edition of the Copa Sudamericana, South America's secondary international club football tournament organized by CONMEBOL.

Estádio Mario Celso Petraglia, also known as Ligga Arena for sponsorship reasons or Arena da Baixada, is a stadium located in Curitiba, the state capital of Paraná, Brazil. It is the home stadium of Club Athletico Paranaense, and has a capacity of 42,372 people. The stadium was the first in Brazil to sell its naming rights; it was known as Kyocera Arena between 2005 and 1 April 2008. It was the first retractable roof stadium built in South America.