Trent Alexander-Arnold claimed his first Real Madrid assist as Gonzalo Garcia's third Club World Cup goal secured a 1-0 victory over Juventus in Miami.
Garcia's 54th-minute header broke Juventus' firm resolve and sent Real into the last eight of the competition.
Randal Kolo Muani and Francisco Conceicao failed to take early chances for Juventus and Real dominated after those misses.
Juventus goalkeeper Michele Di Gregorio made excellent stops to deny Aurelien Tchouameni, Jude Bellingham and Dean Huijsen.
But Di Gregorio had no answer to Garcia's bullet header after summer signing Alexander-Arnold had found space down the right to deliver a perfect cross.
There was more good news for Real as Kylian Mbappe was sent on as a substitute for the final quarter, his first involvement in the tournament following a bout of gastroenteritis.
Real will face Borussia Dortmund in the quarter-finals after the Germans clinched a 2-1 win over Monterrey.
Serhou Guirassy opened scoring for the German club with a right-footed shot from 12 yards out in the 14th minute following an assist from Karim Adeyemi.
Adeyemi turned provider again as he set up Guirassy less than 10 minutes later after breaking free from Monterray's Julian Ryerson and sliding a square pass to his team-mate.
German Berterame hit back for Monterrey in the 48th minute and the Mexican club pressed for an equaliser until the final whistle, with Berterame finding the net again, only for the effort to be ruled out for offside.
Jobe Bellingham will miss the upcoming match against Real, and a reunion with his brother Jude, due to suspension after picking up a second yellow card of the tournament in the 28th minute.
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