Ronaldinho scored his 50th and 51st Spanish league goals on Saturday to help FC Barcelona beat Villarreal 4-0 and establish a four-point lead in the standings.

The Brazilian opened the scoring with a 35th-minute penalty and rounded off the defending champions' victory with a spectacular overhead kick just before the end for his league-leading 10th goal this season.

Striker Eidur Gudjohnsen and midfielder Andres Iniesta also scored.

``It was the goal I dreamed about when I was young,'' Ronaldinho said of his second goal. ``What worried me most was that I was offside. Then when I controlled the ball I saw it was at a perfect height to try an overhead kick.''

Barcelona was missing five injured players, including forwards Samuel Eto'o and Lionel Messi. It has gained five wins and a draw from its opening six league games at Camp Nou stadium this season.

In Saturday's late game, Real Sociedad remained winless this season by drawing 1-1 at Atletico Madrid.

Barcelona has 29 points, followed by Sevilla with 25 and Real Madrid with 23. Zaragoza follows with 22, one more than Atletico.

On Sunday, Madrid visits Valencia and Sevilla plays at Athletic Bilbao.

Also, it's: Real Betis vs. Espanyol; Getafe vs. Levante; Gimnastic Tarragona vs. Mallorca; Celta Vigo vs. Zaragoza; Osasuna vs. Deportivo La Coruna; and Racing Santander vs. Recreativo Huelva.

Barcelona's victory was preceded by sombre music which marked the death this week of Francesc Mitjans, the architect of Camp Nou.

Ronaldinho, who was presented with the FIFPro award for player of the year the previous day, netted his fifth penalty of the season to reach a half century of league goals when Villarreal defender Pascal Cygan was whistled for holding Gudjohnsen.

The forward fired the ball just out of reach of diving goalkeeper Mariano Barbosa and then celebrated by holding up five fingers with his left hand and making an ``0'' shape with his right.

Gudjohnsen, a former Chelsea striker, grabbed his fifth league goal in his debut season in Spain when he rose to head home a cross by Iniesta in the 55th.

Iniesta added Barcelona's third 15 minutes later with a scissors kick off Ludovic Giuly's pass. Iniesta also scored in Wednesday's 2-0 win over Levski Sofia that kept alive the European champion's hopes of reaching the second round of the Champions League.

Ronaldinho delivered the fourth goal in the 88th.

Off balance with his back to goal, the Brazilian controlled substitute Xavi Hernandez's floated pass with his chest and then jumped to execute his overhead shot.

Villarreal, without midfielder Juan Roman Riquelme and five other players, stayed ninth with 18 points.

Sociedad, which has been in the first division since 1967, appeared to be heading for its first victory of the season at Atletico's Vicente Calderon Stadium.

The Basque team took a lead in the 24th minute when midfielder Gari Uranga dived to head home a cross by Jesuli Mora, who joined the club this week from Sevilla.

But Sociedad were unlucky in the 77th minute when goalkeeper Claudio Bravo slipped as he came out to meet a cross. The ball hit defender Ion Ansotegi on the chest and bounced into the goal for Atletico's equalizer.

Sociedad moved up to 19th place with five points from 12 games. However, it will return to the bottom of the standings Sunday if Gimnastic gains at least a point against Mallorca.