Adriano scored two first half goals to lead Barcelona, which will be returning to the Club World Cup final for the first time since 2009 when the team beat Argentine club Estudiantes. Seydou Keita and Maxwell added the others for the Champions League champions.

Barcelona dominated the flow of play against the Asian champions and took the lead in the 25th minute after a blunder by Al-Sadd goalkeeper Mohamed Saqr. A cross from Pedro on the left went to Nadir Belhadj, who tried to direct the ball to his goalkeeper. But Saqr failed to pick up the ball before attempting to clear it with his feet and Adriano charged in to tap in from close range.

Adriano doubled the lead in the 43rd with a left-footed shot from just inside the box.

Lionel Messi set up Barcelona's third goal in the 64th with a perfect pass to Keita, who finished with a flick to the left side of the net. Substitute Maxwell added the final goal in the 81st with an angled left-footed shot that deflected in off the leg of Saqr.

Santos beat J-League champion Kashiwa Reysol 3-1 on Wednesday to advance to Sunday's final.

Barcelona will be looking to extend a four-year winning streak for European clubs.

The Club World Cup is back in Japan for the first time since 2008 after two editions in the United Arab Emirates.

Barcelona forward David Villa broke his left leg during his side's victory over Al Sadd.

"David has fractured his leg and will return to Barcelona for an operation as soon as possible," Barca coach Pep Guardiola told reporters.

"We are all very sad for him. He's a charming personality and it's a massive blow for the team," added Guardiola after the European champions set up a final against Brazil's Santos.

Villa, Spain's all-time top scorer with 50 goals in 81 appearances for his country, fell awkwardly in the first half and immediately signalled to the bench before being rushed to a local hospital in Yokohama.

"He will be out for a long time," confirmed Guardiola. "I don't know how long but it takes a long time to return after a break like this.

"All the players are very worried about David. We hope he will return as soon as possible. Our thoughts are with him and we will have to win the Club World Cup without him." Spanish and European champions Barca said it was the first injury Villa had sustained since joining the club from Valencia last year.

The news is a major setback for Guardiola as his side pursues titles in the Club World Cup, La Liga, the Champions League and the King's Cup this season.

Spain coach Vicente del Bosque will also be concerned as Villa is the country's leading striker looking ahead to the defense of their title at Euro 2012 in Poland and Ukraine.

The 30-year-old played a central role in them winning the World Cup in South Africa last year.