Lionel Messi and Luis Suarez scored as Barcelona came from behind to beat nine-man Atletico Madrid and go three points clear at the top of La Liga.
Atletico, who started the day level with the defending champions, took an early lead when Koke fired home.
But Messi slotted in the equaliser after 31 minutes and Suarez raced clear to score his 19th league goal of the season eight minutes later.
Atletico had Filipe Luis and Diego Godin sent off for bad challenges.
With a game in hand and a three-point lead at the top of the table it looks like Barcelona’s title to lose now.
Luis Enrique’s side have won five of their six league games since the winter break and are beginning to look unstoppable with 17 games to go.
Their remaining fixtures do not look too demanding, bar a visit from Real Madrid, who are now seven points back, at the start of April.
This may have been Atletico’s last chance to stay in the hunt but they have now not won in 10 league attempts at the Nou Camp and with Barca doing the double for a second successive season, there may be no way back for Diego Simeone’s men.