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.
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