Real Madrid Castilla lost 2-1 at home to Real Union on Saturday.
The result ended a four match unbeaten run for the youngsters.
The madridistas started well and the fans who had turned up to the Alfredo Di Stéfano only had to wait 11 minutes to see Castilla score. Valverde sent a free kick in from the left and Hermoso connected with his head before Campuzano blasted home within the six yard box.
But they were over run in the second-half as goals from Juan Domínguez and Ozkoidi settled the points for the visitors.