Sevilla are 9 points behind Real Madrid, but have played one game less and are currently leading 1-0. If they are going to win this match (that chance is quite realistic) then the gap is only 6 points. That in itself can still be bridged, especially since Real Madrid have proved vulnerable in several matches lately and it occasionally drops below their level. I really never expected Sevilla as a serious title contender. Do they still have to play against each other? That would be crucial.
Sevilla is close enough to get a big win but I still don't think that make them a big threat for Real. I don't see Real to lose points against weaker teams, although they have though opponents in the fixture. If they pass this timeframe with minimal damage they will be ready to celebrate another championship. Real Madrid lost only two games this whole season, unless they get a draw streak or something I don't think Sevilla can catch them. Sevilla also need to be faultless in case of Real's point losses, which is hard considering they still have to play against Barca and Atletico.