On 8 January 2014, Marín made his first-team debut, starting in a 1–1 away draw against Racing de Santander for the campaign's Copa del Rey.
[4] On 5 December he appeared in his second match, playing the full 90 minutes in a 4–3 win at Real Betis for the same competition.
[5] Marín made his La Liga debut on 8 April of the following year, starting in a 0–4 away loss to FC Barcelona.
[11] Marín was called up to the Spain under-16 side in 2012, and later appeared with the under-17s in the 2013 UEFA European Championship qualifying and elite rounds.
[12] On 28 January 2014, he was called up to the under-18 team[13] after playing in several matches with the level above, winning the L'Alcúdia International Football Tournament in 2013.