Formed at Villarreal, he spent most of his career in the Segunda División with that club's first and second teams as well at Sporting de Gijón, making 289 appearances.

[3] Mariño was again first choice the following campaign, but as the main squad suffered relegation in La Liga the B's were forced to drop down to Segunda División B even though they had finished in a comfortable 12th position.

After the departures of longtime incumbent Diego López and 41-year-old César Sánchez (the latter retired), he was promoted to the first team by manager Julio Velázquez – also his boss in the second side.

[16] He suffered a right hamstring injury the following March and was replaced by the latter for ten games as the side successfully fought relegation,[17] returning on 29 May for the final match of the campaign in a 1–0 home defeat against UD Las Palmas.

Also that year, he was selected by manager Luis Milla for his UEFA European Championship squad; in the tournament in Denmark, he was a backup to Atlético Madrid's David de Gea as the nation won its third title in the category.