Athletic Bilbao did much more than I expected from them. They simply destroyed Atletico Madrid by 3-0 home as well. 
But I can't say they didn't deserve because Atletico Madrid were really not good enough in both games. 
Having an important player missing like Griezmann also made a bad impact on their performance last night.
It was surprising to me seeing how the match between Athletic Bilbao and Atletico Madrid ended because I never knew that Athletic Bilbao will be this good to easily outperform Atletico Madrid the way they did because they dominated the match from the first minute of the match till the end of the match with a serious pressure against Atletico Madrid I believe that Atletico Madrid did not see the wining coming because they will still be very shocked seeing how well Athletic Bilbao has improved, although I'm surprise that with the kind of players Atletico Madrid has over Athletic Bilbao they will stoop so low that they could not even score just one goal on that match. But I can't say they didn't deserve because Atletico Madrid were really not good enough in both games. Having an important player missing like Griezmann also made a bad impact on their performance last night.