From 12 points behind two weeks ago, the Blues are now looking like mounting a genuine title challenge.
Mata said: "We have to keep trying.
"We have not won anything just by beating these teams, but we have to keep fighting to win games because we are still in with a chance of a lot of trophies.
"It was a very important win against the league leaders, and it gives us a lot of confidence.
"We have won three vital games, against Newcastle, Valencia and now this one, which has broken the negative run we were in and now we can hopefully start a good sequence to keep on rising up the table."