Lamine Yamal still wears braces. Barcelona’s teenage sensation has emerged as opponents’ No. 1 problem thanks to his speed, creativity, and gorgeous goals from Lionel Messi’s old spot on the right flank.

BARCELONA — Lamine Yamal put on a spectacular show as Barcelona sailed into the Copa del Rey quarterfinals with a dazzling 5-1 victory over Real Betis on Wednesday. Atletico Madrid joined it in the last eight with a 4-0 win at second division Elche, its 15th consecutive triumph across all competitions.