ARLINGTON, Texas — Cristiano Ronaldo's storied World Cup journey concluded in heartbreak on Monday as Spain eliminated Portugal with a dramatic stoppage-time goal in the round of 16 at Dallas Stadium.

Mikel Merino, a substitute, scored in the first minute of added time to secure a 1-0 victory for Spain, sending the European champions into the quarterfinals and bringing down the curtain on Ronaldo's sixth and final World Cup appearance. The 41-year-old Portuguese superstar walked off the pitch with a stoic expression, acknowledging fans with a brief wave amid the disappointment of another early exit for his nation.

In the mixed zone after the match, Ronaldo reflected on the defeat with measured composure. "I'm sad to be leaving the World Cup like this," he said. "I gave it my all. I did my best and I'm leaving with a clear conscience. It was my last World Cup, yes, but I'll now have time to reflect and be with my family. I won't be making any rash decisions."

He emphasized that Spain had enjoyed "a bit of luck" on Merino's winner, describing a tightly contested match that "could have gone either way." Ronaldo declined to confirm whether the game marked his final appearance in a Portugal shirt, preferring not to overshadow the team's efforts with a personal announcement made "in the heat of the moment."

The loss also coincided with the end of Roberto Martinez's tenure as Portugal manager. Ronaldo offered praise for the Spaniard, calling him "a great manager, a great human being" and commending his contributions to the national team.

Portugal entered the tournament with high expectations,........

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