( CNN ) Real Madrid fell to a lacklustre 1-0 defeat at the hands of Athletic Bilbao Saturday , potentially handing the La Liga advantage to arch rival Barcelona . A stunning header from Aritz Aduriz shortly before half time was enough to win the day for an organized and impressive Bilbao . Real piled on the pressure for much of the second half but could n't find a way past a staunch opponent despite finishing the match with four strikers on the park . Gareth Bale struck a post with an extraordinary shot from close to the halfway line as full time approached while Arduriz almost doubled Bilbao 's lead with another headed chance late on . The result means second placed Barca can now take top spot should it win at home to mid-table Rayo Vallecano Sunday . Of more immediate concern to Real boss Carlo Ancelotti after the game , however , was his side 's lack of cutting edge . `` I think the problem we are having at the moment is quite clear , '' Ancelotti told reporters . `` We are not finding a way through like we did in the games before . We 've only scored one goal , from a penalty , in two games . `` That is the problem we have to fix . We lack efficiency up front . '' Real are now without a win in two league games while the 4-0 February hammering at the hands of city rivals Atletico Madrid , the clubs biggest derby defeat since 1947 , is still fresh in the memory . With the second El Classico fixture of the season against Barcelona only a fortnight away , Ancelotti is looking for a quick fix to his side 's attacking inhibitions . However , such worries are of little concern to a Bilbao side celebrating its first win over Real in five years . After a slow start to the season the Basques are now up to eighth position . `` We are very proud of how hard we worked , '' goalscorer Arduriz said in comments carried by the AFP news agency . `` The three points will prove a huge boost . '' `` The fans have enjoyed it a lot and they deserved that after the poor performances at San Mames earlier in the season . '' Bayern Munich continued its seemingly inexorable march to a third consecutive Bundesliga title with a come from behind 3-1 victory away to Hannover . Hiroshi Kiyotake gave the hosts a surprise lead after 25 minutes but Xabi Alonso levelled shortly after . A second half brace from Thomas Muller ensured the Bavarians would increase their league at the top of the Bundesliga to 11 points as second place Wolfsburg fell to a 1-0 defeat at Augsburg . Elsewhere Saturday , Borussia Dortmund 's winning streak came to an end with as Jurgen Klopp 's revitalized side were held to a 0-0 draw with Hamburg . Paris Saint Germain returned to the top of the Ligue 1 table , for 24 hours at least , with a convincing 4-1 win over Lens at the Parc de Princes . David Luiz opened the scoring as the first half came to a close before Zlatan Ibrahimovic doubled the Parisian 's advantage from the penalty spot on the hour mark . Substitutes Blaise Matuidi and Javier Pastore secured the win after Yoann Touzghar had pulled one back deficit for Lens . Lyon will return to the Ligue 1 summit should it dispose of Montpelier Sunday . Read : .
Real Madrid rallied to victory against Athletic ##pool . Solitary goal from Aritz Aduriz enough to give the shootout victory . Bayern Munich clinched Bundesliga domination .