Real Madrid Castilla remain fourth in Segunda B after Sunday's 1-0 win over Zamudio.
Immersed in the fight to keep hold of fourth place in the league table, the Whites win sees them remain in the promotion place after the victory against the bottom side, with their fourth victory in the last five games.
It's a run that Santiago Solari's side consolidated thanks to a goal from Nikos in the first half.
The Greek striker, who scored a brace last week, had now scored in the last two consecutive matches.
Mario started for Castilla, lasting 73 minutes.