A Wayne Rooney strike just before half time was enough to give Manchester United a 1-0 win over Manchester City. The visitors just about deserved the three points for the way they had dominated exchanges until the dismissal of Ronaldo on 68 minutes for deliberate handball and a second yellow card.
"Today the focus was very good," Reds boss Sir Alex Ferguson told Sky Sports News.
"Last week our game dropped against Aston Villa and I think that was down to focus and our focus was great today."
"We have had a significant result today and I hope it makes a difference." When asked about Ronaldo's dismissal, the United chief said: "I have seen it again and I think he was trying to protect his face.
"He may have got a little shove. He thought he had heard a whistle but I am not going to talk about the referee. We could be here all day."