Estadio Defensores del Chaco

The record still belongs to a league match. On 17 April 1983, 49,095 people came through the gates in Sajonia for the Superclásico between Cerro Porteño and Olimpia; Cerro Porteño won 2–1.

It was built because Enrique L. Pinho, then president of the Paraguayan league, judged the grounds available to him inadequate. Work began in the mid-1910s and the stadium opened on 4 November 1917 as the Estadio de Puerto Sajonia. In 1924 it spent a short spell as the Estadio Uruguay, named for the Uruguayan Olympic champions, before reverting. The present name, honouring the soldiers of the Chaco War, dates from the mid-1970s; since October 2023 a sponsorship agreement with the Japanese firm Ueno has added a word in front of it.

The Asociación Paraguaya de Fútbol owns and runs the place: the second leg of the 1979 Copa América, the 1999 final between Brazil and Uruguay, the second leg of the first Copa Libertadores in 1960 and the first leg of the 1979 final, both with Olimpia.

A concrete structure collapsed on 1 February 2009, killing two police officers. The modernisation drawn up for the 2030 World Cup, which would have taken capacity to 41,186, was dropped in late 2024.