Real Madrid failed to find their rhythm again as Aritz Aduriz blew the race for La Liga wide open after his goal gave Athletic Bilbao a stunning 1-0 win over the Champions League title holders.
Fresh from beating Espanyol on Wednesday to reach the Copa del Rey final, Ernesto Valverde’s men picked up an unexpected three points in Saturday’s clash at San Mames thanks to Aduriz’s first-half header.
For Real, who thumped Bilbao 5-0 in October’s reverse fixture, it marks another disappointing showing after they were held to a 1-1 draw at home to Villarreal last weekend.
Head coach Carlo Ancelotti demanded a response to that performance in his pre-match news conference, but Madrid failed to heed his call and a lacklustre first-half display saw them go in behind.
The European champions improved after the interval and only some excellent Bilbao defending prevented Karim Benzema and Cristiano Ronaldo from scoring simple tap-ins, while Gareth Bale nearly grabbed a fortuitous leveller late on.
Ultimately, though, the visitors failed to find an equalising goal and they will slip to second if Barcelona beat Rayo Vallecano on Sunday.
Bilbao’s first win over Real since January 2010 means they move up to eighth.
The home side seized the early initiative as Aduriz flashed a shot wide of the left-hand post in just the second minute, but Bilbao found themselves chasing the ball for much of the opening quarter.
For all the visitors’ possession, clear-cut chances proved few and far between, although Xabier Etxeita made a potentially crucial interception to stop Benzema’s centre picking out the unmarked Ronaldo, while Pepe headed over from the resulting corner.
And Madrid’s failure to break down Bilbao’s stubborn defence was punished in the 26th minute. Mikel Rico hung an excellent cross between the visiting centre-backs and Aduriz timed his run perfectly to meet the delivery with a thumping header that nestled in the right-hand corner.
Ancelotti’s men had failed to register a shot on target by half-time, but the break seemed to do the European champions some good.
Only an excellent interception from Mikel Balenziaga prevented Benzema from tapping in Ronaldo’s cross, while the Portuguese seemed set to add the finishing touch to a Bale ball across the six-yard box before goalkeeper Gorka Iraizoz palmed away from danger.
Iraizoz was called into action again in the 74th minute, racing off his line to prevent Ronaldo from sliding home.
At the other end Bilbao almost stole a second when Dani Carvajal’s attempted defensive header set up Aduriz, whose header hit the outside of the left-hand post.
As the clock wound down Madrid came desperately close to making it 1-1 when an apparent cross from Bale, delivered from just in front of the halfway line, sailed over Iraizoz and rebounded off the right-hand post.
The equaliser proved elusive, however, as Madrid slipped to a fifth Liga defeat of the season.
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