Match ends, Barcelona 5, Valencia 2.
Barcelona's 16-year-old forward Ansu Fati marked his first senior start with a second-minute goal as the La Liga champions cruised past Valencia.
The teenager burst on to Frenkie de Jong's square ball to score the opener with a firm strike at the Nou Camp.
Fati then returned the favour five minutes later when he cut the ball back for De Jong to double the hosts' lead.
Kevin Gameiro hit back but Gerard Pique and a Luis Suarez double sealed victory before Maxi Gomez's late consolation.
Nou Camp faithful warm to Fati
The Barcelona academy graduate became the club's youngest La Liga goalscorer last month when he opened his account within six minutes of coming off the bench in the champions' 2-2 draw at Osasuna.
And Fati, who joined the club's 'La Masia' academy in 2012 after moving to Spain from birthplace Guinea-Bissau at the age of six, was rewarded with a starting berth against Valencia after his performance in Pamplona.
Having become the youngest player to play for Barca since 1941, when he featured in the win over Real Betis on 25 August, the exciting forward could not have wished for a better full debut.
With injured club stalwart Lionel Messi gleefully watching from the stands, and the game barely a minute old, Fati timed his run to perfection to meet De Jong's pass and beat former Barca goalkeeper Jasper Cillessen with a crisp finish.
The pair then reversed roles as Fati showed some neat footwork by the byline before cutting the ball back across goal for the Dutchman to smash into the roof of the net.
The teenager showed some deft touches that belied his years, shooting narrowly wide on two occasions, but there were also signs of his inexperience as he was dispossessed trying to dribble past three Valencia defenders just inside his own half.
The visitors sprung clear after winning the ball from Fati, and although nothing came from that particular move, they pulled one back moments later through Gameiro after the video assistant referee overruled the official's offside decision.
Centre-back Pique restored Barca's two goal-advantage when he was on hand to convert the loose ball from close range before Fati was replaced by Luiz Suarez to a standing ovation just before the hour mark.
Suarez opened his account just seconds after entering the fray with a fierce right-footed strike, before adding his second with a rasping low drive in the final 10 minutes.
Substitute Gomez then latched onto Denis Cheryshev's low cross to secure a late consolation for the visitors, who remain in 12th place in the table, while victory for Barca moves them up to fourth.
- 1ter Stegen
- 2Nélson Semedo
- 18AlbaBooked at 53mins
- 21de JongSubstituted forRakiticat 70'minutes
- 8ArthurSubstituted forVidalat 73'minutes
- 31FatiSubstituted forSuárezat 60'minutes
- 20TorresSubstituted forLeeat 67'minutesBooked at 69mins
- 7Gonçalo GuedesSubstituted forCheryshevat 67'minutesBooked at 84mins
- 19RodrigoBooked at 31minsSubstituted forGómezat 72'minutesBooked at 78mins
- José María Sánchez Martínez
- Shots on Target
Second Half ends, Barcelona 5, Valencia 2.
Goal! Barcelona 5, Valencia 2. Maxi Gómez (Valencia) right footed shot from very close range to the centre of the goal. Assisted by Denis Cheryshev.
Foul by Ivan Rakitic (Barcelona).
Maxi Gómez (Valencia) wins a free kick in the attacking half.
Foul by Arturo Vidal (Barcelona).
Lee Kang-In (Valencia) wins a free kick in the defensive half.
Luis Suárez (Barcelona) wins a free kick in the attacking half.
Foul by Francis Coquelin (Valencia).
Attempt missed. Daniel Wass (Valencia) right footed shot from the right side of the box is too high. Assisted by José Gayá with a cross.
Attempt blocked. Lee Kang-In (Valencia) left footed shot from outside the box is blocked. Assisted by José Gayá.
Foul by Nélson Semedo (Barcelona).
Denis Cheryshev (Valencia) wins a free kick in the defensive half.
Denis Cheryshev (Valencia) is shown the yellow card for a bad foul.
Nélson Semedo (Barcelona) wins a free kick on the right wing.
Foul by Denis Cheryshev (Valencia).
Goal! Barcelona 5, Valencia 1. Luis Suárez (Barcelona) right footed shot from the left side of the box to the bottom left corner. Assisted by Antoine Griezmann.
Attempt blocked. Ivan Rakitic (Barcelona) right footed shot from the centre of the box is blocked. Assisted by Luis Suárez.
Foul by Ivan Rakitic (Barcelona).
Daniel Parejo (Valencia) wins a free kick in the defensive half.