Madrid Arena is an indoor arena located in the city of Madrid, at the fairgrounds in the Casa de Campo, just minutes from downtown. Built from the old Rockódromo, the pavilion has been designed by Spanish architects Estudio Cano Lasso who designed this versatile building in 2001 to accommodate sporting events, commercial, cultural and leisure activities. The pavilion is sponsored by the company Telefonica for what is also known by the names of Telefonica and Telefonica Arena Madrid Arena.
The arena was built in 2002 and it was the location of the Mutua Madrileña Masters Madrid men's tennis tournament until Caja Mágica was opened. It has a maximum seating capacity of 12,000 seats and it was the home games venue of CB Estudiantes from 2003 to 2010. When configured to host basketball games its seating capacity is 10,500.