Joan Monfort/Associated Press
Barcelona booked a place in the Copa del Rey quarter-final after defeating Leganes 5-0 on Thursday at the Camp Nou.
The hosts got off to the perfect start after Antoine Griezmann's fourth-minute opener, and Clement Lenglet doubled the advantage after 27 minutes when he met Lionel Messi's corner.
It was all over as a contest after 59 minutes as Messi danced into the box, and the Argentina international's deflected shot beat Leganes goalkeeper Ivan Cuellar.
Arthur grabbed a fourth with 13 minutes remaining, and Barca were home and dry long before the final whistle.