Rayo Vallecano achieved a unique feat after their impressive wins against FC Barcelona and Real Madrid in the current league season.
According to Opta, Rayo have registered victories against FC Barcelona and Real Madrid in the same La Liga season for the second time in their history after doing in 1977/1978, which was their first campaign in the Spanish top flight.
Rayo stunned impotent La Liga leaders Barcelona on Wednesday with a 2-1 win, outplaying the Catalans at a rowdy Vallecas.
Barcelona´s coach urged his players to be wary of Rayo´s threat before the game, but they did not heed his warning. The Catalans have not beaten the Madrid club in their last four league meetings.
"The league is not finished, this is the problem — we have to deserve La Liga, today we deserved defeat," Xavi told reporters.
"What annoys me is that today we did not compete how the game required us to. But we will get players back (from injury), there´s another game on Saturday.
"Here a lot of teams have lost, and others have had a lot of trouble winning. Luckily, there´s another game on Saturday."
Rayo broke the deadlock early on when Alvaro Garcia drilled home across Marc-Andre ter Stegen and into the bottom corner.
Robert Lewandowski should have equalised for Barcelona but Rayo goalkeeper Stole Dimitrievski denied the forward one-on-one, and then the Pole had a goal ruled out for offside.
Rayo doubled their lead after the break when left-back Fran Garcia pressed Frenkie de Jong, collected the ball and drove on to score.
Lewandowski pulled one back for Barcelona after Franck Kessie´s shot was blocked, ending a run of four games without a goal for the division´s top scorer.
Meanwhile, Real Madrid suffered their first defeat of the current season at the hands of Rayo in November last year.
Rayo took an early lead in a see-saw game before Real went 2-1 ahead. Rayo equalised before half-time before winning the match with a twice-taken penalty from Oscar Trejo in the 67th minute.