Estadio Monumental "U" is a football stadium in the district of Ate in Lima, Peru. It is the home of Club Universitario de Deportes of the Peruvian Primera División, and it was opened in 2000 to replace the Estadio Teodoro Lolo Fernandez. Its only legal owner is the club itself. Designed by Progreso International and Gremco S.A., Uruguayan architect Walter Lavalleja Sarriés led the construction of the stadium. At the time of its construction, it became Peru's largest stadium and also the second largest in South America. The stadium was built in accordance with FIFA’s manual of technical specifications for World Cup finals. The new stadium replaced Universitarios old stadium, Estadio Teodoro Lolo Fernández.
In 2010, the club created a presidential luxury box for the President of Peru, called the Palco Presidencial Mario Vargas Llosa, in honor of the Peruvian writer and Universitario fan for winning the 2010 Nobel Prize in Literature. In November that same year, seats were added on the Oriente stand in a pattern that resembles historic player, Teodoro Fernández.
thumb|Opening ceremony of the [[2019 Copa Libertadores]]
Between February and March of 2016, the stadium's façade was painted in cream and maroon, and in December, its two training fields were converted from natural grass to artificial turf. On 5 November 2019, it was chosen as the venue for the first single-match final of the 2019 Copa Libertadores between Club Atlético River Plate of Argentina and Flamengo of Brazil, a match that was played on 23 November 2019 and attended by 78,573 fans. On 31 May 2021, Club Universitario de Deportes unveiled a new statue dedicated to Teodoro Fernández.
Towards the end of 2022, Marathon Sports won the names of the Estadio Monumental, finally in March 2023 the club announced the change in the number of the stadium by the Estadio Monumental U Marathon, converted to the first Peruvian club by ceding the number of its stadium to a sponsor. On 9 March 2023, during the Universitario's 2–0 victory in the first round of the 2023 Copa Sudamericana, the club inaugurated a new LED lighting system, which allowed ultra-high definition television transmissions (4K) to be realized.
On 10 August 2025, the stadium was selected to host the final of the 2025 Copa Libertadores for the second time, with the match being played between Brazilian clubs Palmeiras and Flamengo.
Facilities
thumb|Façade of the entrance to the stadium
Located on Avenida Prolongación Javier Prado Este, the 80,093-capacity stadium and the surrounding sport complex cover an area of . There are 3 fields; the stadium field and two training grounds. The stadium is divided into two main sections; the lower section of stands for the general public and the upper section of 6 floors of luxury boxes. The lower section of the stadium consists of four stands—known as Norte, Sur, Oriente, and Occidente (North, South, East, and West respectively)—each having its own entrance. The east and west stands are all-seaters, while the north and south stands have standing terraces. Behind the western and eastern stands, there is a handicapped zone. In the center of the western stand the Palco Oficial is situated for about 600 people, which has a private entrance and amenities such as bathrooms and a cafeteria. Together, these four stands can receive 60,000 people. The upper section consists of the luxury box suites which are 1,250 in total for 20,000 fans; the suite owners have a private parking lot.
The main field is below ground level and from the outside the stadium, only the luxury suites are visible. The field is in size. Modern floodlighting was installed, with a total of 160 spotlights of 2,000 watts with four levels of illumination. Above the northern stand, an LED display electronic scoreboard stands which measures . Above the southern stand, a screen is situated that measures . Above the western stand, a surveillance room with eight security cameras monitoring the interiors and exteriors of the stadium. The field is watered by sprinkler irrigation.