Messi to the rescue once again!
Lionel Messi Scores Late As Barcelona Beat Atletico Madrid 2-1
That is an important win becauuse it was Messi's 400th win with Barcelona. Messi and Barca got that point with a big match from Calderon.
Rafinha gave Barca the lead when Luis Suarez - who had an effort ruled out - took a shot which ricocheted off two defenders to land at his feet.
Diego Godin levelled when he headed home Koke's free-kick.
But Messi pounced in the 86th minute to win the game for the champions after his initial effort was blocked by defender Stefan Savic.
Real Madrid, who have two games in hand, will go back to the top if they beat Villarreal at 19:45 GMT.
Atleti, the 2014 champions, are now nine points off top spot.
Watch highligts: Atletico Madrid 1-2 Barcelona