Raphinha's first-half goal was enough for Barcelona to see off Valencia at home and extend their lead at the top of La Liga to 10 points, at least for a few hours.
Barca wasted no time asserting themselves on the game, and Raphinha handed the Blaugrana the lead inside 20 minutes, meeting Sergio Busquets' chip with a deft header.
Ferran Torres should have doubled Barcelona's lead in the second half, but clanged a spot-kick off the post after 54 minutes.
Barca then handed Valencia a further lifeline after Ronald Araujo was sent off for dragging Hugo Duro down as he ran through on goal.
Xavi's side, though, turned in a measured showing for the final 30 minutes, grinding out a 1-0 home win that could go a long way to helping them seal the title.
GOAL rates Barcelona's players from Camp Nou...