Substitute Mikel Merino scored a 91st minute winner as Spain defeated Portugal 1-0 on Monday in Arlington, Texas. The goal, which came seconds into second-half stoppage time, secured a tense last-16 victory for the European champions.
The win sends Spain into the World Cup quarterfinals for the first time since winning the title in 2010. The match also brings the curtain down on Cristiano Ronaldo's World Cup career.
Spain will now face either the United States or Belgium in the quarterfinals. The match is scheduled for Friday in Inglewood, California.