Mata also played a key role in the success, and the Spain international has said that his team 'could not have had a better start'.
"When you are working in the pre-season, you know you must get ready for the official games. By August, you can't wait anymore for the Premier League to start. The first of our list of fixtures was at home, in front of our fans, and we couldn't have had a better start," Mata wrote in his weekly blog.
"The team worked harmoniously, we had some spells of great football and our shots on goal were good. Personally, I enjoyed myself on the pitch and I believe all my teammates did the same.
"Some of them (Nemanja Matic and Lukaku) made their debut as Reds in the Theatre of Dreams and I'm sure they will always keep very nice memories of this day. Same as I do with my game against Cardiff, already a few years ago.
"It was a joy to have a game like this one, we needed it after failing to win the first title of the season in Skopje. I was really pleased to see our fans happy after the game, on their way home, and also your reactions on the social media, of course."
Next up for United is a trip to Swansea City on Saturday afternoon.