Atletico Madrid were the form side in La Liga coming into their long trip to Gran Canaria, but Las Palmas pulled off a famous win on the Canary Islands.
Match Report
Diego Simeone's side came into the tie riding a six-game winning streak in the league and could have leapfrogged cross-town rivals Real, who had played a game more.
But the away side were undone by Garcia Pimienta's confident outfit who, if not for Girona would have been lauded as the surprise package of the young season in their first top-flight campaign in six years.
After a goalless first period the deadlock was finally broken 51 minutes into the game when Los Amarillos skipper Kirian Rodríguez arrowed a long drive past Jan Oblak.
The 20-year-old starlet Alberto Moleiro registered his first assist but it was the clever dummy from Manchester City loanee Maximo Perrone, 20, that created the space for the shot.
The home side doubled their advantage in the 75th minute after midfielder Javier Munoz intercepted a sloppy pass into the middle from Mario Hermoso and launched a counter.
Former Barcelona and Sevilla forward Munir laid off a pass out wide for team-mate Benito Ramirez del Toro to run onto and score.
Atletico managed to make the final minutes nervy for Las Palmas thanks to Alvaro Morata's strike in the 83rd minute. But it proved only to be a consolation for the 2021 LaLiga champions.
The result sees them remain in third after 11 games, three points behind early pace-setters Real Madrid and Girona.
Match Events
0' The match is about to start!
15' Barrios' shot stopped
23' CHANCE! Riquelme's shot stopped
33' De Paul's long shot stopped
34' Munir's long shot over the bar
51' GOAL! Las Palmas 1-0 Atletico (Kirian Rodríguez)
55' Riquelme hits the bar
62' Yellow Card! De Paul booked
75' GOAL! Las Palmas 2-0 Atletico (Ramírez)
83' GOAL! Las Palmas 2-1 Atletico (Morata)
91' Morata hits the bar
Line-ups
Las Palmas XI: Munir, Munoz, Álvaro Valles, Alex Suárez, Kirian Rodríguez, Saúl Coco, Mika Mármol, Sergi Cardona, Alberto Moleiro, Máximo Perrone, Marvin Park
Subs: Nuke Mfulu, Sinkgraven, Cristian Herrera, Aarón Escandell, Eric Curbelo, Marc Cardona, Ramírez, Sory Kaba, Loiodice, Julián Araujo, Ale Gorrin, Juanma Herzog
Atletico XI: Witsel, Oblak, Savic, Griezmann, Morata, Koke, De Paul, Hermoso, Nahuel Molina, Riquelme, Pablo Barrios
Subs: Azpilicueta, Saul , Gimenez, Correa, Llorente, Soyuncu, Javi Galán, Antonio Gomis, Sergio Mestre