"I think it is the first time we've probably both played in a more advanced role, together with him up behind," Rooney said of Mata.
"It worked well. Obviously Juan is a very talented footballer, got a good footballing brain and when he gets in positions you know as a forward you can make runs and he can see you.
"I think also Shinji Kagawa coming in played excellent as well. The two of them were causing West Ham problems."