However, Real restored their lead three minutes later when Ceballos bagged his second of the game with a close range finish after an error from Pacheco.
Questions have since been raised on the side's ability to successfully defend their crown and although their latest defeat has been a tough pill to swallow for fans, reports from the Valdebebas suggest that Zidane is exuding calm and confidence as part of his belief that there is no better medicine than bringing home a win in their upcoming away fixture against Alaves.
Zidane's 19-year-old son Luca could also make the trip as Real's third-choice goalkeeper, and like Enzo, he has played for the French Under-19 team, while his younger brothers Theo (15) and Elyaz (11) also play in Real youth sides.
The Portugal global, yet to score his first goal of the La Liga season, twice fired shots that crept narrowly wide and saw another rebound off Pacheco's far post.More news: Donald Trump unveils new sanctions against North Korea over nuclear programme
Real should have ensured a far more comfortable afternoon after the break as Pacheco made a great save to deny Isco, Cristiano Ronaldo struck the woodwork twice and Sergio Ramos blazed over with the goal at his mercy.
And Malaga won their first point of the season following a pulsating 3-3 draw against Athletic Bilbao.
"He played very well, and besides the two goals he helped us a lot", coach Zinedine Zidane said.More news: Kingsman: The Golden Circle: hellaciously violent and a whole pile of fun
Madrid reportedly paid Betis 16.5 million euros ($19.7 million) for the up-and-coming midfielder.
"We are happy that a player of his stature wants to come to Atletico Madrid", Atletico boss Diego Simeone said of Costa's return.
"But you could see with Carrasco, Griezmann and Filipe that if we got the final pass right we could win the game".
Ronaldo struck the post nearly immediately after the start of the second half and perhaps should have done better.More news: Japan to deploy new anti-missile system