Real Madrid’s star forward Cristiano Ronaldo (L) scores his first goal against Real Sociedad during their La Liga match at the Santiago Bernabeu on Sunday.— Reuters photo

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.
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.
Madrid captain Casillas was left out for the second consecutive game but was called upon after just five minutes following a penalty conceded by his replacement Adan Garrido who was red-carded.
Xabi Prieto, who was to grab a hat-trick, scored from the spot-kick to equalise after Karim Benzema had put Madrid ahead in the second minute with Sami Khedira then restoring the lead for Jose Mourinho’s side after 35 minutes.
Prieto struck again before half-time before Ronaldo came to the rescue with a brace after the restart.
Prieto hit his third with 14 minutes to go but Sociedad also finished with 10 men as Daniel Estrada was given a second yellow card.
Madrid faced an injury crisis at the back with Pepe, Fabio Coentrao, Marcelo and Raul Albiol all injured and Sergio Ramos suspended.
They got the perfect start with Khedira finding Benzema in space in the centre of the penalty area and he found the corner with a clinical finish.
But if the Bernabeu crowd were expecting to then see a comfortable victory after such an inconsistent season they were badly mistaken as only three minutes later Adan conceded the penalty for the visitors to draw level.
Adan’s poor pass to Ricardo Carvalho went to Carlos Vela who bore down on goal and was upended by the shot-stopper. The referee pointed to the spot and also dismissed Adan which meant Casillas would play after all.
The player nicknamed ‘Saint Iker’ by Spain fans for his exploits in the recent successes of the national side was unable to make the perfect start as Prieto fired home the penalty.
Madrid went back ahead with Khedira flicking in a shot by Carvalho from the edge of the area but they were never comfortable at the back and Prieto got his second when a Vela strike fell to him and he drove the ball past Casillas.
After the break the game hit a lull before Ronaldo responded with a double.
Benzema hit a ball over the top and he finished clinically and then a couple of minutes later he struck a free-kick into the top corner.
Sociedad didn’t give up with Xabi Prieto latching onto a Chory Castro pass before beating Casillas but their hopes of an equaliser were hit by a red card for Estrada.
At the Camp Nou, Pedro Rodriguez hit a double with Xavi Hernandez and Lionel Messi also scoring in a rampant first half as Barca welcomed coach Tito Vilanova back after cancer surgery.
Vilanova chose to play Andres Iniesta in his three-man attack and leave Alexis Sanchez and David Villa on the bench against Espanyol who were unbeaten in four games under new coach Javier Aguirre.
Iniesta crossed for an unmarked Xavi to put Barca ahead after 10 minutes and Cesc Fabregas pulled the ball back for Pedro to score from close range. The visitors had minimal possession but still Sergio Garcia could have put them back in the game but flashed wide after Carles Puyol missed the ball.
Pedro produced a neat finish to beat keeper Francisco Casilla midway through the first half and then Messi struck from the penalty spot after Fabregas was felled by Casilla.