Already wary of Spain's offense, opponents better beware of its defense, too.
Spain has never advanced to a semifinal match at a World Cup in four opportunities between 1934 and 2002.
Vicente Del Bosque is facing calls to replace striker Fernando Torres with Fernando Llorente for Saturday's quarter-final with Paraguay.
Llorente replaced the fading Fernando Torres in the 59th minute on Tuesday, and his introduction changed the dynamic of Spain's attack.
Villar, who turned 33 on Wednesday, plays for Valladolid in the Spanish league.
Paraguay became the fourth South American team to reach the quarter-finals on Tuesday.
Neither team could come up with a goal during the 120 minutes of play.
The Japanese boast of no less than three set-piece specialists.
But the Japanese fear they may have become too predictable and are wary that Paraguay has had time to study them.
Star forward Keisuke Honda and midfielder Yusuhito Endo both scored against Denmark from long range.
Martino's side drew 0-0 with NZ to qualify comfortably while Italy finished bottom after crashing 3-2 to Slovakia.
Their 3-1 win over Denmark in final Group E game on Thursday meant Japan had equaled their best World Cup run.
Paraguay reached the round of 16 as New Zealand were knocked out.
Paraguay will look to a trio of sharpshooters to see them into the World Cup second round.
The Paraguayans broke through in the 27th minute when Enrique Vera met Lucas Barrios' pass with a one-time shot.
Paraguay and Slovakia will enter Sunday's Group F showdown in Bloemfontein with very different feelings.
Paraguay can leave Cape Town with a confident swagger after the South Americans held Italy.
De Rossi scored an equaliser in the 63rd minute against Paraguay on Monday.
Title holders Italy are in danger of being caught napping by in-form Paraguay in their Group F opener on Monday.
Paraguay striker Roque Santa Cruz is hoping to impress his Manchester City bosses at the World Cup.