Real Sociedad extended their unbeaten run in La Liga to seven games as they overcame Sevilla 2-1 on Thursday, while Rayo Vallecano also won.
Philippe Montanier's side had claimed the scalps of Valencia and Malaga in recent weeks and they added Sevilla to that list courtesy of strikes from Carlos Vela and Alberto de la Bella.
Sociedad opened the scoring in the 18th minute through former Arsenal striker Vela, who netted his seventh goal of the season.
Chilean defender Gary Medel pulled a goal back for the visitors four minutes into the second half before substitute de la Bella secured the points with 20 minutes remaining at the Anoeta Stadium.
Sociedad move to within two points of sixth-placed Levante, who were comprehensively beaten 3-0 at Rayo.
After a scoreless first half, Rayo blitzed their opponents with three goals in the final half-hour.
Ignacio Martinez Nacho broke the deadlock on the hour mark before Piti doubled the home side's advantage 20 minutes later.
Substitute Franco Vazquez, who was on the pitch for no more than two minutes, completed the scoring with seconds remaining to send Rayo to 25 points alongside Sociedad.
Espanyol, meanwhile, continued to pull away from the relegation zone after recording a 2-0 victory against cellar-dwellers Deportivo La Coruna.
Former Barcelona and Atletico Madrid midfielder Simao sent Espanyol ahead on 31 minutes and Christian Stuani put the result beyond doubt inside the final two minutes.
Espanyol are now two points clear of the drop zone, with Granada and Mallorca scheduled to play on Saturday.