Barcelona backed up their Spanish Super Cup triumph by thrashing Real Betis to cruise into the quarter-finals of the Copa del Rey.

Teenager Lamine Yamal scored one and assisted another as Barca netted five goals for the second consecutive game, having beaten rivals Real Madrid 5-2 in Saudi Arabia on Sunday.

Gavi gave the hosts a third-minute lead before Yamal, 17, set up Jules Kounde for Barcelona's second.

After the restart Raphinha, Ferran Torres and Yamal all found the target.

Real Betis scored a late consolation goal through Vitor Roque's 84th-minute penalty but were soundly beaten.

La Liga leaders Atletico Madrid also advanced into the last eight with a comfortable 4-0 win at second-tier Elche, with struggling Leganes and Getafe also beating lower-league opposition to go through.