How Cadiz won against both Real Madrid and Barcelona?  

Cádiz Club de Fútbol, S.A.D., known simply as Cádiz, is a professional football club based in Cádiz, Andalusia, Spain. Founded in 1910, it plays in La Liga, holding home games at Estadio Ramón de Carranza, with a 20,724-seat capacity. 

Real Madrid Club de Fútbol, commonly referred to as Real Madrid, is a Spanish professional football club based in Madrid. Founded on 6 March 1902 as Madrid Football Club, the club has traditionally worn a white home kit since inception. 

Futbol Club Barcelona, commonly referred to as Barcelona and colloquially known as Barça, is a Spanish professional football club based in Barcelona, that competes in La Liga, the top flight of Spanish football. 

Mirandilla36, CC BY-SA 4.0 , via Wikimedia Commons