I don't know what happened to Atletico Madrid but in that match the Atletico Madrid squad seemed to lose their accuracy. At the beginning of the first half Atletico Madrid had a chance but well their shooting accuracy was really a big problem in the match. While Inter Milan actually also had more good chances. But we have to appreciate J. Oblak as a goalkeeper who I thought was really great in the match. Because he is always able to read the movement of the direction of the ball that will be shot by Inter MIlan players. If not J. Oblak I think Atletico Madrid could concede a few more goals. But the goalkeeper's saving action was extraordinary.
I already guessed Inter Milan would excel in the match. So this result is not surprising at all. It's just that Atletico Madrid did play below their usual performance.
Inter Milan created many opportunities and they only converted one of them to the only and winning goal. They should finish those chances better to have a safer advantage before a second match in Spain. It's a little disappointment from this winning but the match ends and they can celebrate the winning. Meanwhile, after celebration and a next match, they can sit down and build up a properly plan for a second match.
Atletico Madrid will become stronger and more dangerous at their home stadium and I believe Inter Milan will not have an easy and comfortable match in Spain. Oblak had a great match for Atletico Madrid and he will continue to be a foundation for his club to win against Inter Milan in an aggregated result.