We are Spain."
Spain needs one more unbeaten match to equal the longest undefeated streak in the country's football history of 35 matches.
"The World Cup starts now," added Yamal.
Other Round of 16 Matchup
Co-hosts United States will play Belgium at Lumen Field in Seattle, seeking their first quarterfinal appearance since 2002.
The US squad reached this stage after defeating Bosnia and Herzegovina 2-0, but manager Mauricio Pochettino will miss top scorer Folarin Balogun due to a red card.
Belgium enters the match after topping their group with a 5-1 win over New Zealand, overcoming a slow start of two draws.
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The Belgian team historically dominates the matchup, having won the last six meetings against the United States in all competitions since 1930.
