BARCELONA suffered a late collapse to deny Ronald Koeman his first silverware as Nou Camp boss.
The Dutchman won the Super Cup three times as a player for the Catalan giants but was on the touchline to see his side throw away the trophy with just minutes to play.
Inaki Williams scored a stunning winner for Athletic BilbaoCredit: Getty Images – Getty
Antoine Griezmann looked to have settled matters when he bagged his second of the night with 15 minutes to play.
But as the clock ticked into the 90th minute, Barcelona’s fragile defence was exposed yet again.
Iker Munian’s brilliant delivery from a free-kick was met by Asier Villalibre who hammered it into the roof of the net to send the game into extra-time.
With the wind in their sails, Inaki Williams took four minutes to bag the winner when he curled in a stunning winner to leave Barcelona deflated.
It was the club’s third Super Cup success with their first coming in 1984 and second six years ago.
But the defeat will put further pressure on Koeman with his side seven points adrift in the title race.
Just when the game needed a moment of magic to open the scoring, Lionel Messi stepped up to the plate.
The Argentine picked up the ball on the right and played a stunning pass into the path of Jordi Alba.
Antoine Griezmann thought he had settled the contestCredit: Getty Images – Getty
Oscar de Marcos bagged the equaliser on the stroke of half-timeCredit: Getty Images – Getty
The left-back drilled in a cross and after Messi’s shot was initially blocked, Griezmann was on hand to bury his strike.
It was the 29-year-old’s ninth goal of the campaign and his second in this competition.
It sparked wild celebrations from Koeman’s men but they were to be short-lived.
Just two minutes later Atheltic Bilbao were level through Oscar de Marcos.
Inaki Williams’ delightful chip found the defender who took advantage of some slack defending from Alba.
Bilbao then thought they had gone ahead through Raul Garcia but VAR ruled it off for offside.
Antoine Griezmann fired Barcelona ahead on 40 minutesCredit: Getty Images – Getty
Just as the game edged towards extra-time Griezmann bagged his second.
Alba was key again, breaking down the left flank and whipping in a cross which Griezmann was alert to.
Villalibre then bagged the equaliser before Barca’s misery was compounded in the extra period.