Spain laboured to an uninspiring 1-0 victory over Iberian rivals Portugal in their last-16 tie to set up a quarter-final meeting with the winners of USA vs Belgium.

In an underwhelming game that failed to live up to billing in Dallas, Mikel Merino proved decisive, arriving late from the bench and latching onto a smart Ferran Torres pass to plant beyond the clutches of Diogo Costa in second-half stoppage time.

His calm and conclusive strike was the only real moment of quality from an encounter boasting so many superstars, none of whom were able to rise to the occasion quite in the way many rival nations' high-profile players have.

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The result, of course, had consequences for Portugal beyond ending their tournament, too. Cristiano Ronaldo revealed before the game that this summer marks his last appearance at a World Cup. The Portugal captain was visibly emotional at the close, knowing his side failed to properly show up for his final farewell tour. There will be no fairytale ending to an international career that spectacularly spanned two decades.

Ronaldo was actually the only Portugal player to land a shot on target all night, with Spain's immense control and impressive defensive structure winning out. They have become the first team in World Cup history to register six successive clean sheets, and are yet to concede a goal at this tournament.

Luis de la Fuente's side advance to the quarter-final stage for the first time since winning their only World Cup title back in 2010 in South Africa, and face either the United States or Belgium on Friday.

The key moments from Arlington

3: SAVE! Mikel Oyarzabal draws a decent stop from Diogo Costa by landing the first effort on target of the game.

8: SITTER! Oyarzabal dragged his effort wide from a promising position in acres of space.

11: VAR! Ronaldo claims for a penalty after a scuffle with Rodri in the box, where he ends up floored. VAR check but nothing given.

16: DOUBLE SAVE! Diogo Costa produces two stops to deny both Lamine Yamal and Baena on the follow-up.

37: CHANCE! Ronaldo latches onto a glancing header across goal from Joao Felix but can't beat Unai Simon.

41: Nuno Mendes rattles a rasping effort off the crossbar via the head of Pedro Porro.

76: MISS! Bruno Fernandes crashes an effort into the side-netting after good work from substitute Rafael Leao.

90+1: GOAL! Merino is slipped through by Torres and beats Costa with a neat, low finish inside the post.

Farewell, Cristiano

Cristiano Ronaldo's 27th World Cup appearance conspired to be his last. He scored in all six editions in which he appeared, holding the all-time record for highest number of tournaments scored at.

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