Carlo Ancelotti's side were humbled by their biggest rivals at home as Real Madrid took an early blow in the Spanish league title race in the first Clasico of the season, as they were handily beaten 4-0 by a rampant Barcelona at the Santiago Bernabeu.

A Robert Lewandowski second-half double, followed by Lamine Yamal's fine finish and Raphinha's deft chip, saw Los Blancos seen off at home - and fall six points behind their bitter rivals in La Liga.

Madrid repeatedly tried to exploit Barca's high-line, but had little to show for it.

Kylian Mbappe and Vinicius Jr found themselves caught offside time-and-time again, succumbing to the Blaugrana's well-executed offside trap.

The Frenchman had the ball in the net after 31 minutes, but saw the flag go up after a mistimed run.

Madrid were made to pay for their lack of cutting edge early in the second half when Lewandowski ran through on goal to give the visitors a 1-0 lead.

He added a second two minutes later, ghosting between Madrid's centre-backs before heading into the bottom corner.

And Lamine Yamal offered the killer blow, smashing into the roof of Andriy Lunin's net from a tight angle as a scattered Madrid defence was left searching for answers.

Yamal subsequently hit Ronaldo’s ‘Calma’ celebration after becoming the youngest La Liga Clasico goal scorer, while Real Madrid 42-match unbeaten run ended on the brink of history.  

Raphinha offered an all-too-easy fourth five minutes from time.

Hansi Flick is the first Barca coach to make their debut in el Clasico at Santiago Bernabeu in any competition and with the game since Terry Venables on September 2, 1984.

Meanwhile Ancelotti has remained hopeful saying, although the result of the game is hurt, but the season is long.

“We will not give up, the season is long. Last time we lost 0-4 to Barca we won La Liga and the Champions League.”