Two consecutive draws have left Real Madrid as the outsiders for the title, when they had it all in front of them.
Having watched Barcelona draw and Atletico Madrid lose last weekend, they knew that six points out of six would put them level with their city rivals at the top of the table.
Those dropped points meant they were four off the top going into this match.
Celta Vigo manager Luis Enrique is a former Madrid player, but he is better known for his ties with Barcelona.
Enrique is the favourite for the managerial position at the Camp Nou and loves nothing more to wind up the team where he once plied his trade.
Here are six things we learned from Celta Vigo's match with Real Madrid.