Real Madrid moved six points clear of Barcelona at the top of LaLiga as Karim Benzema's goal proved enough to claim a 1-0 victory over Atletico Madrid.
Both previous derbies between the sides this season - one in LaLiga and one in the Supercopa de Espana final - had finished 0-0 but Saturday's encounter finally bucked the trend.
Having held out somewhat in the first half, Madrid, who were buoyed by a double change from Zinedine Zidane at half-time, broke the deadlock through Benzema's first home goal against Atleti.
Substitute Vinicius Junior went close to capping a fine performance with a goal late on, but Madrid's failure to add another did not prove costly as they ended Atleti's six-match unbeaten run at the Santiago Bernabeu.