Real Madrid cruised to the top of the Spanish Liga on Saturday with a 5-2 home slaughter of feeble Osasuna, straight after neighbours Atletico had prevailed 4-0 at Celta Vigo for their first win of the season.
Cristiano Ronaldo celebrated his return to action after his knee injury by making it 1-0 after just six minutes, by turning in a perfect centre from Gareth Bale.
Then defenders Danilo, Sergio Ramos and Pepe took centre stage by taking advantage of some abysmal defending from the visitors to increase the hosts' lead.
Luka Modric completed the rout for Real while Oriol Riera and Unai Garcia scored consolation goals for Osauna, for whom Roberto Torres had a penalty saved by Kiko Casilla.
Osasuna had defender Tano Bonnin sent off 10 minutes from the end.
Real have won their first three games and have equalled the club record of 15 straight league wins, established in 1961.
"We are in great form and we just want this to continue," Real captain Ramos said.
"We are enjoying our matches and scoring a lot of goals."
Real are three points above Las Palmas and Barcelona, who will join them on nine if they manage to beat Sevilla and Alaves respectively later Saturday.
Also Saturday, Malaga were to host Villarreal, who are still looking for their first win.
Earlier on, Atletico Madrid enjoyed their first win, a 4-0 romp at troubled Celta with all the goals coming in an impressive second-half blitz.
Celta dominated the first half but lacked a cutting edge in attack.
Spain midfielder Koke gave Atletico the lead in the 53rd minute by turning in a centre from Antoine Griezmann, then Griezmann made it 2-0 20 minutes later by heading in a cross from Saul.
The Euro 2016 top scorer added a third goal for the visitors by heading in a Juanfran centre before the sub Angel Correa completed the rout as the overworked Celta defence started to fall apart.
"That second half was perfect, just wonderful," Atletico coach Diego Simeone said.
"From Koke's goal onwards, we were completely in control. That was exactly what I wanted today: speed, precision and hard work."
Atletico are now fourth with five points from three games. Celta are bottom with no points at all - and with coach Eduardo Berizzo already in jeopardy after the latest defeat.
"This is obviosuly not the start that we were planning for," Berizzo said.
"Now the alarm bells are ringing and we will have to start thinking about how to get of the relegation zone."