Mata hailed the victory as an important win against a strong Bundesliga opponent for Manchester United, who lost their first Champions League match 2-1 to PSV Eindhoven.|
"It was a very tough game because we were physically tired at the end," Mata said. "But we did what we had to do.
"The manager made a list of penalty takers and I am the first right now and I have confidence. We knew we had to win today. We are happy today."
Matchwinner Smalling said United deserved the win after recovering from Caliguiri's early strike, adding: "We started up against it after conceding a goal. But we created a lot of chances and deserved the win.
"We didn't give them too many chances. We created some ourselves which gave us a deserved victory. We knew they played with two wingers which gave us space -- Anthony Martial's pace used that well."