Lionel Messi once again haunted Sevilla as his hat-trick secured a 4-2 win at the Ramon Sanchez Pizjuan on Saturday.
LaLiga's leaders twice went behind only for their captain to drag them ahead as he took his personal tally to 36 goals against Sevilla in all competitions, before Luis Suarez netted a late fourth.
Jesus Navas and Gabriel Mercado had put Pablo Machin's side in the ascendancy, but a fourth game without a win has dealt serious damage to their Champions League ambitions.
A bold Barca line-up that included Suarez, Philippe Coutinho and Messi in attack proved susceptible to the Sevilla counter-attack, with Navas marking his 300th LaLiga start with a precise finish after Wissam Ben Yedder sent him clear in the box.