Bayer Leverkusen spoiled the inauguration of Hannover's new stadium by beating the hosts 3-0, while struggling Bochum came from behind to earn a 2-2 draw with visiting Hertha Berlin.
Berlin and Leverkusen both moved past Bremen, and Berlin missed an opportunity to move up to fourth place when it conceded an equalizer 10 minutes from time.
In Hannover, fireworks marked the inauguration of the AWD arena, one of the venues for next year's World Cup finals.
But the only fireworks on the field came form the visitors, who stunned the home side with textbook counterattacks.
Andrei Voronin used a perfect cross to the far post from Paul Freier to knock the ball in after 18 minutes, and Dimitar Berbatov made it 2-0 in the 36th after Hannover lost possession in midfield.
Freier got the third in the 58th when his long-range shot was deflected into the net.
Argentina's Juan Roman Riquelme scored three goals, two on penalties, to lead Villarreal over Valencia 3-1, ending the defending Spanish league champion's 10-game unbeaten streak.
The loss left Valencia in third place and dropped it 12 points behind league-leading FC Barcelona, which beat Racing Santander 3-0 on Saturday.
Sevilla downed Albacete 2-0 to move up to fourth place and overtake Espanyol, which lost 4-1 at Deportivo La Coruna.
Livorno upset 17-time Italian league champion AC Milan 1-0, dropping the defending champion five points behind front-running Juventus.
Juventus won 2-0 victory against visiting Brescia.
In Livorno, forward Corrado Colombo kicked in a rebound in the 28th to hand Milan its second loss of the season.
With his club playing its first season in the top division in 55 years, captain and Livorno native Cristiano Lucarelli embarked on a victory lap around Armando Picchi stadium after the final whistle.
Livorno is a port city known for its left-leaning political views and beating Milan, owned by Italy's right-leaning Premier Silvio Berlusconi, was cause for celebration.
"For Livorno it's a historic day," club president Aldo Spinelli said. "This city will remember a day like this forever.
"To beat the champions of Italy after 55 years, and by playing a great game, was very beautiful. I had asked the team for four points in the last two games and they've gotten six."
FC Porto and Sporting Lisbon both won on the road and took command of the first division while Benfica slipped off the pace with an embarrassing home loss to Beira Mar.
Defending champion Porto kept its unbeaten away record in tact thanks to a 17th-minute strike from Ricardo Costa but scrambled to hold back Leiria in a second half controlled by the home team and scraped a 1-0 victory.
Ricardo Sa Pinto, who missed most of last season through injury, scored in each half and Liedson got his 15th goal of the season to give Sporting a 3-0 win at Gil Vicente.
The two clubs each have 34 points, one point ahead of second-place Braga and Boavista, which both won over the weekend. Braga beat Academica 2-0 and Boavista triumphed by the same margin at Nacional.
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