Iberian derby preview: Portugal vs Spain analysis

One of the most compelling round-of-16 ties in the World Cup is set for Dallas, Texas, as Ronaldo's Portugal meet Spain at AT&T Stadium for a place in the quarterfinals. Referee Anthony Taylor takes charge.

Spain arrive in Dallas having barely raised a sweat, with their round-of-32 win over Austria continuing a tournament marked by control and efficiency. Luis de la Fuente's side have yet to concede a single goal in North America; goalkeeper Unai Simón broke Walter Zenga's 36-year-old record for the most consecutive minutes without conceding at a World Cup. Mikel Oyarzabal, with four goals in the tournament, added a brace against Austria to underline why Spain go into this match as favourites.

Portugal's journey has been bumpier. Roberto Martínez's side finished behind Colombia in their group, and their survival in the round of 32 against Croatia hinged on a "Snicko" technology ruling that ruled out a last-gasp equalizer. Rafael Leão shone in that tie, but the debate around 41-year-old Ronaldo continues; many argue the all-time great has become a hindrance against elite opponents, and it is difficult to disagree.

The head-to-head record leans firmly towards Spain: Portugal have won just seven of 43 meetings, and their penalty shootout triumph in last summer's Nations League final was their first win over Spain since 2010. Spain anticipate a stiffer examination from Portugal's attacking talent than any opponent so far, but they also plan to exploit Portugal's vulnerabilities out of possession.

Predicted XIs
Portugal (4-2-3-1): Costa; Cancelo, Dias, Veiga, Mendes; J. Neves, Vitinha; Conceição, Fernandes, Leão; Ronaldo
Spain (4-2-3-1): Simón; Porro, Cubarsí, Laporte, Cucurella; Rodri, Pedri; Yamal, Olmo, Baena; Oyarzabal

Image: Sports Illustrated