Costa gave Atlético an early lead in typical style, latching on to his own flicked header to barge towards goal and lash in from a tight angle. The Argentine endured World Cup disappointment with Argentina but his time at Barcelona has seen him collect trophy after trophy, and with his old rival Ronaldo out of the picture, most expect that to continue.
Atletico turned it on in extra-time, with two world-class finishes from Saul Niguez (98) and Koke (104), meaning Real conceded four for the first time since Rafa Benitez was in charge of the club in 2015.
Those changes have given new impetus to forwards Gareth Bale, Karim Benzema and Marco Asensio to step up and fill the void left by Ronaldo, who scored 450 goals in 438 matches for Madrid. "Zidane did great work and Madrid had success, but that is part of the past".
Oil steady as emerging market woes dim demand outlook
This was said to be due to weaker-than-expected oil demand data from Latin America and the Middle East in the second quarter. To be sure, recent strength in the US currency has fueled a cautious mood in oil markets.
Goalkeeper Thibaut Courtois did not feature at all following his recent arrival from Chelsea, and nine of Real's starting line-up also started May's Champions League final win over Liverpool in Kiev. At 2-1 up, Bale anxious Atletico with a driving run past five defenders before his shot was blocked while in the very last move of normal time, the Welshman nearly set up a dramatic victor only for Marcelo to miskick his attempted volley.
But Courtois will be line to make his debut in Sunday's La Liga clash against Getafe at the Bernabeu.
The big Belgian signed for Los Blancos in a £35 million move last week and has been training with his new club for the big game against his former employers, Atletico.
"We are at a time when new players arrive to improve the team".