A composed, late header from substitute Mikel Merino sent Spain into the World Cup quarterfinals on Monday, defeating Portugal 1-0 in the round of 16 at AT&T Stadium in Arlington, Texas — the air-conditioned home of the NFL's Dallas Cowboys. The goal came in the first minute of second-half stoppage time and brought a dramatic close to what Cristiano Ronaldo had already confirmed would be his final World Cup appearance.

Merino, who had only entered the pitch in the 85th minute, was initially brought down and a foul was called. As Portugal's Bernardo Silva argued with the referee, Merino quickly played the ball back in, ran toward goal and calmly finished after a pass from fellow substitute Ferran Torres. The goal was his second of the tournament and capped a comeback season that had been hampered by injury — one that also saw his club Arsenal win their first Premier League title in more than 20 years. The 70,649 fans in attendance were treated to a tight, largely defensive contest that had seemed destined for extra time before Merino's moment of clarity.

The result ends Ronaldo's journey on football's biggest stage. The 41-year-old Al-Nassr forward, the all-time leader in international goals (146) and appearances (233), scored three times in this tournament but was largely kept quiet by Spain's backline. His best chance came in the 37th minute when a deflected header left the ball floating in the air and he attempted a clever backward flick, only for goalkeeper Unai Simón to recover and make the save. Simón extended his World Cup record to 609 minutes without conceding, and Spain became the first team to record six consecutive shutouts at the tournament. Portugal pushed desperately in the closing stages, with Bernardo Silva heading just over the bar, but could not find an equaliser.

Speaking after the match, Ronaldo was gracious but visibly disappointed.