Goalkeeper Iker Casillas came off the bench for 10-man Real Madrid who needed a second half double from Cristiano Ronaldo to beat Real Sociedad 4-3 while leaders Barcelona cruised to a 4-0 win over Espanyol.
Real Madrid's Portuguese coach Jose Mourinho (L) and Real Madrid's goalkeeper and captain Iker Casillas (R) look on during the Spanish league football match Real Madrid vs Real Sociedad at the Santiago Bernabeu stadium in Madrid on January 6, 2013. Madrid won 4-3.
Barcelona, whose goals all came in the first-half against their city neighbours, remain 16 points clear of their bitter rivals and eleven ahead of second-place Atletico Madrid who drew 1-1 with Mallorca.
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