Enzo Zidane struck for Real Madrid Castilla in their 2-1 win at Segunda B opponents Guadalajara.
It was Castilla's second straight win in Segunda B Group II.
The result keeps them within three points of leaders Barakaldo, who visit the Estadio Alfredo Di Stéfano next week in the matchday's stand-out fixture.
Zidane and Javi Munoz were the goalscorers for Castilla.