Liverpool failed to make a period of second-half pressure tell, and Cristiano Ronaldo headed home the second from a corner in the 79th minute before Nani added a third two minutes later after good interplay with Rooney
Ferguson was hugely pleased with the display and told Sky Sports: "It was a really good performance - a performance of maturity.
"We've seen a team mature over the last six months and today they hit their high peak."
Asked to comment on the dismissal of Mascherano, the Scot added: "He has been booked and kept badgering the referee. We've talked about dissent and I think that was dissent."