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Madrid ran out 3-2 winners in a thrilling contest on Wednesday evening to set up a Spanish Super Cup final with Athletic Bilbao.
Barcelona came from behind twice to level the scores but Federico Valverde's goal in the first period of extra time settled the game.
Gavi battled Kroos in the heart of midfield and managed to leave the World Cup winner floored in one passage of play.
The 17-year-old posted an image of it to his story with no caption, just himself darting away from Kroos.
It did not stay up for long however and it has now been deleted, probably because Xavi's side ended up losing.
Kroos is one of the most decorated midfielders of the modern era, having won four Champions League titles as well as the 2014 World Cup with Germany.
Fair play to Gavi for picking fights early in his career.
It's been a breakout season for youngster, who has now featured in 25 games this campaign.
Gavi also made his Spain debut last year and Barcelona are desperate to improve his contract, with a number of top European clubs interested.
His release clause is currently set at £50 million, but a new deal is set to increase that drastically.
January signing Ferran Torres, as well as Ansu Fati and Pedri all have release clauses set at a staggering £1 billion.
Barcelona are 17 points behind Real in La Liga, but 'Los Blancos' had to work for a landmark 100th win over their bitter rivals.
Madrid took the lead in the 25th minute through Vinicius Jr, who has taken his season tally to fifteen goals.
Just before the break, Barca found themselves level after Eder Militao's attempted clearance hit Luuk de Jong and bounced in.
Madrid dominated the first 45 minutes and should've found themselves ahead.
Karim Benzema popped up in the second half to give Madrid the lead once again before Ansu Fati's header guaranteed another 30 minutes in Saudi Arabia.
Valverde hit a third in the 98th minute to send Madrid to Sunday's final in Riyadh where they face current holders Bilbao.
Marcelino's side ran out 2-1 winners over Atletico Madrid on Thursday in equally dramatic fashion, thanks to a late comeback.
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