Spain are through to the quarter-finals of the World Cup after substitute Mikel Merino struck a dramatic stoppage-time winner to defeat Portugal 1-0 and bring an end to Cristiano Ronaldo's hopes of lifting the trophy.

Merino, introduced from the bench late in the contest, proved to be the decisive figure — netting in the dying moments to seal a hard-fought victory for Spain and send their rivals crashing out of the tournament.

The result extends Spain's deep run in the competition while condemning Ronaldo and Portugal to an early exit, ending what could prove to be the veteran forward's last chance at World Cup glory.