Ferguson felt United deserved the three points and paid tribute to the defence, who have conceded just 16 goals in 12 away games this season.
"We had so many chances. It was a terrific football match and it was an excellent result, and I'm very pleased for us," said the Scot.
"They had some great chances. Our keeper (David De Gea), Jonny (Evans), Rio (Ferdinand) were terrific and we had a few chances ourselves, the second half in particular.
"In the first half we hit the woodwork three times but we deserved to win.
"They have had a great home record over the years and it is a very important result for us.
"It's a good position (we are in) we are pleased. Tonight you can look at the performance of the players. They put their bodies on the line, blocking shots, great headers out of defence, really determined effort by the players."