On 27 October 2009, Alcorcón secured the most famous victory in its history after it defeated La Liga powerhouse Real Madrid 4–0 at home in the first leg of its round-of-32 match in the Copa del Rey.
On 27 October 2009, Alcorcón achieved a remarkable triumph over La Liga giant Real Madrid 4–0 at home in the first leg of its Copa del Rey match, marking a historic milestone for the club.