Real Madrid recovered from the second-minute dismissal of goalkeeper Iker Casillas to secure a battling 1-0 win at Espanyol on Sunday and cut Barcelona's lead at the top of La Liga to five points.
Iker Muniain gave Athletic a deserved lead in the 32nd minute by bundling the ball home after Real failed to get back in time to defend a counterattack.
A round-up of Saturday's action in the Premier League.
Images from matches played across European leagues on Saturday
Cristiano Ronaldo, fired up by rival Lionel Messi's midweek hat-trick for Barcelona, struck four goals in 26 second-half minutes as Real Madrid crushed Celta Vigo 7-1 at the Bernabeu on Saturday.
Andres Iniesta and Carles Puyol scored to help Barcelona to a 2-1 comeback victory at home to Valencia on Saturday, but it was Real Madrid who moved to the top of La Liga with a 4-1 win in Malaga.
Striker Raul scored after 24 minutes and late in the second half Robinho broke away to seal the side's third win in a row.
Zinedine Zidane declared that leading Real Madrid to their first La Liga title in five years, and 33rd overall, was one of the happiest days of his glittering sporting career.
"More than the 4-0 scoreline, the most important effect of our win is the psychological blow," said Ronaldinho.
Girona reclaimed top spot in LaLiga after beating champions Barcelona 4-2
Real Madrid moved into the semi-finals of the Champions League after their makeshift defence held on for 0-0 second-leg draw with Liverpool at Anfield on Wednesday to complete a 3-1 aggregate win.
IMAGES from the Premier League matches played on Tuesday.
Barcelona beat third-placed Getafe 2-1 at home on Saturday to stay on the heels of La Liga title rivals Real Madrid but the champions were made to sweat for all three points by the impressive visitors. Antoine Griezmann sent the Catalans ahead in the 34th minute with a cool finish with the outside of his left foot after being played in by an outstanding pass from Lionel Messi, while Sergi Roberto doubled Barca's lead five minutes later.
Real Madrid's Cristiano Ronaldo was named UEFA's Player of the Year, beating Lionel Messi and Gianluigi Buffon to the prize, European soccer's governing body announced during the Champions League group stage draw in Monaco on Thursday.
Barcelona rode their luck to come from behind and win 2-1 at Real Sociedad on Saturday, continuing to banish their awful record in San Sebastian and maintaining their perfect start to the La Liga season.
Karim Benzema scored his sixth goal in four games as Real Madrid beat Alaves 3-0 on Sunday for a fourth successive La Liga victory which took the European champions to within eight points of leaders Barcelona.
Real Madrid's resurgent La Liga run skidded to a halt as they fell to a shock 2-1 defeat at home by struggling Girona on Sunday in which captain Sergio Ramos was sent off in added time, leaving them nine points adrift of leaders Barcelona.
News of all that's transpired on and off the football field
The Catalans are overwhelming favourites to win the game and have an outstanding home record in the Champions League, remaining unbeaten at the Nou Camp in the competition since losing to Bayern Munich in 2013.
"Football sometimes gives you (things), sometimes it takes away from you. And it's a possibility that they can score in the last second, just as much as you can score in the first minute. But I think we have a bright future ahead,"
Cristiano Ronaldo struck his 43rd league goal of the campaign to set Real Madrid on their way to a 3-0 home win over Sevilla on Sunday that put them within a whisker of a first La Liga title in four years.
Cristiano Ronaldo's fifth Champions League hat-trick inspired Real Madrid to a 3-0 comeback victory over VfL Wolfsburg on Tuesday that clinched a place in the semi-finals for a sixth successive season.
Barcelona closed to within a point of La Liga leaders Real Madrid when Lionel Messi scored one goal, created two and conceded a penalty in a 3-1 win at home to champions Atletico Madrid on Sunday that eased pressure on under-fire coach Luis Enrique.
Photos from the Champions League matches played across Europe on Tuesday
Images from football matches played across Europe over the weekend.
Cristiano Ronaldo was sent off as leaders Real Madrid beat Cordoba 2-1 in La Liga on Saturday thanks to late Gareth Bale penalty.
Diego Costa gave Europa League holders Atletico a dream start against Champions League winners Real by firing them ahead after 49 seconds, knocking down a long pass and smashing the ball into the net from a tight angle.
The old format was skewed in favour of the bigger clubs, who could rest players for a first leg and swallow defeat before calling on their stars to turn the tie around in the return game.
A summary of Wednesday's Champions League first leg quarter-finals between Barcelona and Dortmund and Real Madrid, and Paris St Germain and Aston Villa.
A first-half double from Karim Benzema helped Real Madrid cruise to a 3-0 victory away to Cadiz that moved them top of La Liga.
Real Madrid did well to hold Atletico in regulation time and then win the match 4-1 in penalty shootouts.
Unconvincing Real Madrid survived a huge scare at rock bottom Rayo Vallecano when they conceded two quickfire second-half penalties but held on under severe pressure to secure a nervy 3-2 victory in La Liga on Saturday.
Real Madrid's Karim Benzema was in red-hot form, scoring 15 times in the competition and lifting the trophy for a fifth time in his career after the Spanish side beat Liverpool in the final.
Cristiano Ronaldo's Champions League debut for Juventus lasted only 29 minutes as he was red-carded but the Italians began their Group H campaign impressively with a 2-0 victory at Valencia on Wednesday. Penalties either side of halftime by Miralem Pjanic sealed the points for the visitors as Valencia's return to European competition after a two-year absence fell flat.
A summary of Saturday's action in LaLiga, Bundesliga and Serie A.
Promoted Alaves dealt champions Barcelona a shock 2-1 defeat at the Nou Camp on Saturday while Cristiano Ronaldo returned from injury to help Real Madrid thrash Osasuna 5-2 and go two points clear at the top of La Liga. With Lionel Messi, Luis Suarez and Andres Iniesta on the bench, Barcelona went behind to the visitors in the 39th minute before Frenchman Jeremy Mathieu equalised in the 46th. Ibai Gomez then scored the winner in the 64th.
Cristiano Ronaldo grabbed a record 23rd La Liga hat-trick to guide leaders Real Madrid to a 3-0 victory over Celta Vigo. It also helped the European champions extend their club record winning streak to 18 matches in all competitions.
Real Madrid will be without forward pair Cristiano Ronaldo and Gareth Bale, midfielder Toni Kroos and defender Pepe for Tuesday's UEFA Super Cup encounter with Sevilla in Trondheim, Norway.
Barcelona's Lionel Messi beat Real Madrid's Cristiano Ronaldo to take home the UEFA Best Player in Europe Award on Thursday.
Barcelona thrashed Real Betis 5-1 on Wednesday to book their spot in the Copa del Rey quarter-finals.