Sevilla are my favourite for the Europa League title as well. I think like this even in a season that Sevilla have had big difficulties in general. Because their recent performance has started to get more interesting. There is some good level of improvement as it can be clearly seen from their recent results. They don't lose games easily most of the time from now on.
I remember how good they played against Manchester United in the second leg as well. This must be a warning for Juventus to defend them well in their matchup. Juventus need to be more capable of scoring multiple goals in a game as well. If they perform similar to the one against Sporting then their job will be really difficult.