Mata struck twice in the 4-0 win.
"We produced a great performance, scored four goals and played some great football, especially in the second half. This is a happy day for us. We played very well. For me, it is a pleasure to play with players like Chicha, Shinji and Adnan.
"They are quality players so it is easy to play alongside them. Today, we did it on the pitch and we created some chances to score. I am very happy for Chicha as well, I think he deserved his goal and for Adnan after coming off the bench."
When quizzed on his free-kick and the resulting celebrating with David De Gea, Mata said: "I normally practice twice a week after training. I like to improve how good I can be from free-kicks and I try to score as much as I can in training. Today, I was lucky to score.
"David was pretty happy for me and he had told me that I was going to score before the game. That is why I went to him. They were very different goals, maybe the first one was more important because it made it 1-0 but the second one was very special as well."
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