On 7 January 2015, Duarte made his first-team debut, playing the full 90 minutes in a 2–1 away loss against Valencia CF in that season's Copa del Rey.[5] His maiden La Liga appearance occurred on 8 February, against the same opponent and with the same scoreline, but at the Estadi Cornellà-El Prat.[6]
Duarte renewed his contract with the Catalan club on 11 June 2015, signing until 2019 and being promoted to the main squad.[7]
Alavés
On 29 May 2017, after falling down the pecking order, Duarte signed a three-year deal at Deportivo Alavés in the same league.[8] He played 24 matches in his first season, in a 14th-place finish.[9]
Duarte scored his first goal in the Spanish top division – and as a professional – on 16 May 2021, in a 4–2 home win over Granada CF.[10][11] In July 2023, after helping to another promotion to the main tier, he renewed his contract until 2026.[12]
^Villalobos, Fran (8 February 2015). "A Champions por la izquierda" [Taking the left lane to the Champions League]. Marca (in Spanish). Retrieved 24 March 2015.
^"Duarte, renovado hasta 2019" [Duarte, renewed until 2019] (in Spanish). RCD Espanyol. 11 June 2015. Retrieved 12 June 2015.
^Juárez, María Carmen (26 May 2015). "Rubén Duarte, convocado por Del Bosque" [Rubén Duarte, called up by Del Bosque]. Mundo Deportivo (in Spanish). Retrieved 26 May 2015.