Athletic Bilbao struck in the extra time to knock defending champion Barcelona out of the Copa del Rey with a 3-2 win Thursday.

Athletic dominated a thrilling match and went ahead early thanks to a beautiful cross-shot from Iker Muniain who curled the ball past Marc-Andre ter Stegen into the top corner.

Former Manchester City forward Ferran Torres equalized for Barca with a brilliant right-foot strike from the edge of the area, his first goal for the club.

Inigo Martinez put Athletic back in front after 86 minutes, winning a challenge against Gerard Pique to score, but Pedri netted a fine goal in stoppage time to send the game into extra time.

Man-of-the-match Muniain scored the winner with a penalty after the video assistant referee spotted a handball from Jordi Alba inside the area.

Athletic joined Real Madrid, Real Sociedad, Valencia, Real Betis, Rayo Vallecano, Mallorca and Cadiz in the quarterfinals. The draw will take place Friday.

With the loss, Barcelona's disappointing campaign took another turn for the worse.

Eliminated at the Champions League group stages, it lost to Bilbao in a repeat of last year’s final which it won 4-0 and two of its most promising players, Ansu Fati and Pedri, were substituted due to injury.

"We will see on Friday what they have but it is worrying how Ansu Fati left the game," Barcelona manager Xavi Hernandez told a news conference.

"We knew that it would be a tough game and I'm proud my players fought and gave their best. We still have LaLiga and Europa League to fight for and we'll do it until the end."