MADRID - An injury-time strike from substitute Imanol Agirretxe condemned 10-man Barcelona to a 3-2 defeat at Real Sociedad on Saturday, their first of a record-breaking La Liga season.
Lionel Messi scored in a 10th consecutive game for a landmark second time, putting Barca ahead after six minutes with Pedro Rodriguez doubling lead.
But Chory Castro pulled a goal back before the break and then got his second after 63 minutes.
With Gerard Pique off the field after receiving a red card, Agirretxe got the winner in the 91st minute.
There appears to be no record out of reach for Messi who scored in 10 straight matches in the 2011-12 season, notching up 18 goals in the process.
It equalled the mark set by Ronaldo, who scored 12 in 10 games during the 1996-97 season, and Mariano Martin who put away 18 in 10 matches between 1942 and 1943.