Goals from Dani Olmo, Raphinha, and an acrobatic Lamine Yamal strike powered the Catalans to 52 points, one ahead of Real Madrid.
The result keeps Barcelona second in the table on 16 points from six games, two behind leaders Real Madrid. Oviedo remain 18th with just three points.
Mbappe fires Real Madrid to the summit, Bayern lose at home and Dortmund stay in the title hunt.
IMAGES from football matches played across Europe on Sunday
Girona's Castellanos hits Real Madrid for four in fresh blow to title hopes
Texans pray and hold a vigil a day after a teenager murdered 19 children and two teachers at the Robb Elementary School in Uvalde, Texas.
Then the air rifle women's team consisting of Arya Borse, Zeena Khitta and Ramita downed the Korean trio of Yeeun AN, Eunji Kwon and Jeongin Jang 17-9 in the title decider to give India the third gold of the day.
A huge party began in Fernando Alonso's home town of Oviedo on Sunday when the Spanish driver became the country's first F1 champion.
None of Europe's top five leagues have been able to hold matches with spectators since football has returned, although championships in countries such as Serbia, Bulgaria and Denmark have allowed fans back in to matches.
Rediff.com picks 20 top photos from the month of September.
David Moyes continued his unbeaten start at Real Sociedad when he rested a host of regulars in a 0-0 draw at third-tier Real Oviedo in a King's Cup last-32, first-leg match on Thursday.
The FIFA 2022 World Cup will kick-off in Qatar on Sunday, November 20. Here is a list of the 26-man squads playing in the quadrennial global football extravaganza.
"After many kilometres travelled together, the Spanish Football Federation and Fernando Hierro have called an end to their relationship now that Spain have finished their participation in the World Cup," said a statement on the Spain team's website (www.sefutbol.com).
Factbox on Renault's Fernando Alonso, who became Formula One's youngest champion in Brazil.
Sporting Director of Spain's Football Federation (RFEF) Fernando Hierro has been named the national team's new coach for the duration of the World Cup in Russia, the Federation said in a tweet on Wednesday.
City hold a 2-1 lead after an impressive performance in Paris last week and Guardiola's men are within touching distance of their first Champions League final.
New Spain coach Fernando Hierro plans to carry on Julen Lopetegui's good work as he prepares to lead his country into their World Cup opener against Portugal on Friday.
India discovered scoring ways to finally end Italy's World Cup adventure through a field strike from Lalremsiami (20th minute) and two penalty corner goals from Neha Goyal (45th) and Vandana Katariya (55th) to register the emphatic win.
When the Indian brunost bravely ventured into the international cheese arena in Spain, along with 4,000 others from 45 countries, before 230 judges, its sterling desi pedigree spoke for itself, winning a silver in the brown cheese category and giving India a berth on the global cheese map.
Spain defender Dani Carvajal spoke out on Thursday in favour of his side's interim coach Fernando Hierro
Costa Rica coach Oscar Ramirez could task two of his players with man-marking Brazil playmaker Neymar when the teams clash in St Petersburg on Friday, but said his side would not try to foul the forward out of the game.
The neighbourly rivalry and the intriguing prospect of a duel between Real Madrid team mates Sergio Ramos of Spain and Portugal's Cristiano Ronaldo meant the Group B match was always going to be one of the highlights of the opening round.
David Moyes' honeymoon as coach of Real Sociedad came to an abrupt end when they were trounced 4-0 by Villarreal.
Conchita Martinez will take over as Spain's Davis Cup captain for the Group I tie away to Russia.
Kevin Mirallas' first-half penalty miss proved costly as Everton's dismal run continued with a 0-0 Premier League draw at home to West Bromwich Albion on Monday.
Everton's Romelu Lukaku spared his side a fifth straight defeat by snatching an added-time equaliser to salvage a 1-1 home draw with West Ham United in the FA Cup third round on Tuesday.
Barcelona came through a testing local derby at Espanyol, winning 3-0 to cling to their slender lead at the top of La Liga after rivals Real Madrid had set the challenge by beating Valencia 2-1 in the earlier kick-off.
Uruguay crushed Ecuador 4-0 in their Copa America opener on Sunday with help from an early sending off that deflated their opponents and assured the 15-times champions the simplest of starts to their campaign.
Manchester United may still be some way from the team that won 13 league titles under Alex Ferguson, but a combination of exciting attacking players and suspect defense means they are regaining the club's reputation for great entertainment.
From the Syrian civil war to the Ukrainian crisis to the terror unleashed by the dreaded Islamic State, there was no lack of news in 2014. Rediff.com presents a selection of the year's most enduring moments year from around the world.
Manchester United captain Wayne Rooney did not have the faintest idea who Anthony Martial was when the Monaco forward was linked with a move to Old Trafford earlier this week, according to team mate Morgan Schneiderlin.
'It was a crazy game where we had the bit of luck that we didn't have in Slovenia'
Jose Mourinho maintained his hold over Arsene Wenger with leaders Chelsea enjoying a routine 2-0 win over Arsenal on Sunday after the two old adversaries became involved in an ugly touchline spat.