Pierre-Emerick Aubameyang (left) of Barcelona scores against Real Madrid on March 20, 2022 in Madrid, Spain. Photo: VCG

Pierre-Emerick Aubameyang scored twice as a rejuvenated Barcelona gave a football masterclass to inflict a humiliating 4-0 defeat on rivals Real Madrid on Sunday, thrashing Carlo Ancelotti's LaLiga leaders on their own ground.

A soldout Santiago Bernabeu ­stadium watched silently as a much-improved Barca under the command of new coach Xavi Hernandez dominated "El Clasico" from the start.

With Ousmane Dembele and Ferran Torres exposing Real's defensive frailty on the flanks, Barca opened the scoring in the 29th minute with an Aubameyang header from a Dembele cross.

Barca kept up the tempo against a disorganized and lifeless Real ­Madrid and extended their lead when defender Ronald Araujo headed in from a Dembele corner.

Ancelotti tried to change the dynamic, making two substitutions during the break but Barca scored in the first minute of the second half with an angled shot from Torres after a backheel by Aubameyang.

Five minutes later, former Manchester City forward Torres returned the favor, teeing up ex-Arsenal striker Aubameyang for his second goal.

Barca had several opportunities to extend their lead, but Real goalkeeper Thibaut Courtois avoided any further humiliation.

With Real Madrid sitting comfortably on top of the standings with 66 points, Sunday's Clasico was never likely to determine the fate of La Liga's title race.

But pride was on the line and Xavi's much improved Barca showed that their recent return to form was genuine. After their fifth consecutive league win, Barca are third in the standings on 54 points with a game in hand, three points behind second-placed Sevilla.

Having fallen as low as ninth in the table when Ronald Koeman was sacked in October, Barca have been revitalized under Xavi.

They are unbeaten since an extra-time defeat by Athletic Bilbao in the Copa del Rey on January 20 and have scored 24 goals in their last seven league games.

"We didn't expect this result, but our objective was achieved. We came to win and show what we are worth," Barca's Sergio Busquets told reporters. "If we still have a small chance to make a run for the title, we will fight until the end. It's very difficult but in football anything can happen. We are Barca."

Xavi said the win could be transformative for the club.

"It can change the dynamics of the present and the future," said Xavi. "

We had lots of chances and we were much better than Madrid, far superior. We deserved to score so many goals."

Asked if Barcelona are back, Xavi said, "It can be. This is the right path."

And while the result might have little bearing on the title race this term, a defeat of this magnitude, at home, and against Barcelona, will cause serious reverberations at Real Madrid.

It will go down with other historic Clasico thrashings, like when Barca won 6-2 at Real Madrid in 2009 under Pep Guardiola or 5-0 at home two years later.

"We played badly and I planned the game badly," said Ancelotti. "I am sorry for the defeat and I am sad. But we have to keep it in perspective."