AD Alcorcón

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.[5] In the club's first ever official match against a team from the top flight, its opponent fielded nine international players in its starting eleven: Jerzy Dudek, Álvaro Arbeloa, Raúl Albiol, Christoph Metzelder, Royston Drenthe, Mahamadou Diarra, Guti, Esteban Granero, Raúl, Rafael van der Vaart and Karim Benzema, with Ruud van Nistelrooy, Fernando Gago and Marcelo appearing as substitutes in the second-half.[6]

On 10 November, in the second leg at the Santiago Bernabéu, the club lost 1–0, but won 4–1 on aggregate, thereby going through to the next round of 16,[7] where the club was ousted by Racing de Santander, 2–3 on aggregate.

Following the Alcorconazo, in the 2009–10 season, Alcorcón was finally promoted to level two after defeating Pontevedra (3–0 on aggregate) and Ontinyent (4–3 on aggregate) in the promotion play-offs. In the second tier, the club played twice the promotion play-offs but were defeated by Real Valladolid in the final of the 2012 edition and by Girona in the semi-finals of the 2013 edition.

In 2017, Alcorcón qualified to the Copa del Rey quarter-finals for the first time in their history after a penalty shoot-out victory over Espanyol, but were beaten 2–0 on aggregate by Alavés. The club was 13th in the 2017–18 season in the Segunda División, just 4 points away from being relegated,[8] and also struggled in the next campaign, but retained its place in Segunda División after finishing the season in the 14th position.[9]

On 16 April 2022, Alcorcon was relegated to third division after defeated by Cartagena, ending their 12 years stay in second division.

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

No. Pos. Nation Player 27 DF  ESP Iker Bachiller 28 DF  ARG Emi Hernández 29 FW  ESP Luis Molina 30 MF  ESP Rafa Diz 32 DF  ESP Álvaro Yuste

No. Pos. Nation Player 33 GK  ESP Jagoba Zárraga 34 MF  ESP Isra García 36 FW  ESP Yago Paredes — FW  ESP Abdoulaye Keita

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

No. Pos. Nation Player — DF  ESP Barbu (at Real Unión until 30 June 2022) — DF  ESP Edu Viaña (at Atlético Mancha Real until 30 June 2022) — DF  PAN Fidel Escobar (at Cultural Leonesa until 30 June 2022) — DF  ESP Javier Castro (at Celta B until 30 June 2022) — MF  MAR Abdel Al Badaoui (at Waasland-Beveren until 30 June 2022) — MF  ESP Aitor González (at Tudelano until 30 June 2022)

No. Pos. Nation Player — MF  ESP Miki Muñoz (at Navalcarnero until 30 June 2022) — MF  ESP Pipo (at Cornellà until 30 June 2022) — FW  ESP Ale Llamas (at Antequera until 30 June 2022) — FW  ESP Álvaro Juan (at Cultural Leonesa until 30 June 2022) — FW  ESP Iván Cédric (at Toledo until 30 June 2022) — FW  ESP Gabri López (at Izarra until 30 June 2022)