Atletico Madrid built on their Madrid derby triumph by comfortably beating Real Sociedad 3-0 at the Vicente Calderon to record their biggest home league win of the season.
Diego Simeone's side took an eighth-minute lead through Diego Reyes' own goal, then Saul Niguez put them further at ease by volleying home a minute into the second half.
Former Sociedad forward Antoine Griezmann added the third from the penalty spot, converting for the first time from 12 yards in the Primera Division.
The Rojiblancos consolidate second place thanks to their second straight league win, moving five points behind Barcelona who play on Thursday, while La Real suffered a first defeat in six matches.
Despite playing a fourth game in just 10 days, Simeone made just one change from the team that won 1-0 at neighbours Real Madrid on Saturday, bringing in Luciano Vietto for Fernando Torres.
His opposite number Eusebio Sacristan made six changes from the team that drew 1-1 with Malaga.
Buoyed by their derby win, Atletico began energetically, and Saul had the first effort of the game with less than two minutes gone, firing over the bar.
They went ahead a few minutes later, Reyes attempting to clear Koke's cross and instead hitting beyond his goalkeeper Geronimo Rulli who was waiting to scoop up the ball.
It was the second season in a row in which Sociedad had conceded an own goal at the Vicente Calderon, Mikel Gonzalez putting through his own net then, and it was the Basque team's third own goal of the season.
The visitors were limited to just one shot in the first half, a wayward attempt by Asier Illarramendi, while Atletico kept dominating after taking the lead and could have extended their advantage through Saul and Vietto, but had to be content with just the one goal before the break.
They got a second immediately after the re-start, the fruit of another defensive error from La Real and Atletico's attentive pressing game.
It was Griezmann who robbed the ball in the visitors' half after a lapse of concentration and he chipped over a pass for Vietto to chase to the byeline and cut back into the box for Saul to comfortably volley home.
Atletico's third came from another individual error, even if Alberto de La Bella can consider himself unfortunate to be punished with a penalty for his soft challenge on Griezmann.
The Frenchman brushed himself off to take the penalty, putting previous missed penalties against Benfica and Real Madrid behind him to calmly send Rulli the wrong way and score.
It was only when they were three goals down that the visitors started to show any interest in the game.
Carlos Vela spurned a wonderful chance to pull a goal back after Bruma laid on a pass for him at the near post, the Mexican miscuing from close range.
Then Jonathas stuck a post and later missed the target as the final whistle approached, while Atletico substitute Angel Correa had a last-minute goal incorrectly ruled out for offside.