The match has started already and it's in the 20mins with both team playing 0-0. Just like you have said, Atletico Madrid should secure a win here as they are playing with a weaker team.
Diego Simeone side will secure this three points because there's nothing special about Sevilla, they're struggling this season after failing to reach the top points in the UEFA Champions League and I don't see any solid reason for them to bounce back, maybe they will entertain their fans after Christmas. Watching them play against Los Colchoneros, no hope for an equalizer yet. Second half already and Atletico Madrid taken the lead with 1-0 and I don't hope for any comeback from the visitors because they failed to absorb the pressure coming in from the home club.
Yes indeed, there seems to be no hope for Sevilla to be able to score a goal in this match and moreover, Atletico managed to score first. Therefore, of course Atletico will also be able to maintain this 1-0 score advantage until the end of the match. But unfortunately, in the 70th minute one of Atletico players received a red card, and maybe this incident opened the opportunity for Sevilla to make a draw.
But yes, the funny thing is about Caglar Soyuncu who got a red card in the 70th minute, because in fact Caglar Soyuncu had just entered as a substitute in the 66th minute but only 4 minutes later Caglar Soyuncu got a red card. With this incident I think it is clear, that a situation like this will have a bad impact but ya, at least Atletico are also still able to maintain this victory by playing more defensively of course.