Mata had no doubt about how significant this result could be when the league finishes in two weeks' time.
He said: "It was a very important victory. Playing against Manchester United and Tottenham were two big games in a week for us.
"We got a win here and if we can get a win on Wednesday it will help.
"Both teams played a bit slowly. For the goal I just tried to shoot, aim for the second post and the most important thing was that it was a goal."