Barcelona concede four at home for first time since 2003

Lionel Messi scored a penalty in reply but a Marc-Andre ter Stegen error saw Giovani lo Celso add a third for Betis.

Barcelona's second league loss of the season left it one point ahead of Atletico Madrid, which it visits next round after an worldwide break.

The loss ended an unbeaten run of 42 consecutive home games for Barcelona in the league dating back to a 2-1 defeat to Alaves on September 10, 2016.

Espanyol could jump both and move level on points with the Catalans when they visit Sevilla later on Sunday. "We hae to work on that, see the mistakes and make sure they don't happen again".

Messi's second goal of the afternoon was initially ruled out for offside before the decision was overturned by the VAR, but Betis held on for a famous victory.

Betis, meanwhile, climb to 12th.

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One of LaLiga's most popular players, 37-year-old Joaquin was instrumental in Betis' stunning first-half performance and showed superb composure to coolly slot past Ter Stegen to double his side's advantage. We lack freshness when we have to finish attacks and we have to improve that.

Betis seemed faster, sharper and hungrier while Barcelona's midfield was repeatedly carved open on the break. He weaved inside Sergi Roberto and struck hard into the net.

Joaquin Sanchez made it 2-0 for Betis before halftime.

Arturo Vidal replaced the jaded Arthur Melo at half-time and, in the 68th minute, Barca pulled one back, with Jordi Alba tugged down by Cristian Tello, and Messi converting the penalty for his eighth league goal of the season.

Messi briefly rekindled the comeback in the 79th when he threaded a pass forward for substitute Munir El Haddadi, who laid off for Vidal to reduce the deficit to 3-2.

With less than nine minutes to the end of regulation period, Ivan Rakitic was handed marching order after receiving a second yellow to as the home team were reduced to ten men. Betis, meanwhile, can toast a momentous win that lifts them up to 12th.