United ran out 3-1 winners but we were in the game right up until Cristiano Ronaldo fired home United's third goal two minutes from time.
Earlier, Robbie Keane slid home Aaron Lennon's cross after 24 minutes, Carlos Tevez replied but Jermaine Jenas had two chances to put us ahead before the turning point - Michael Dawson handled, a penalty was awarded, he was sent off and Ronaldo made it 2-1 from the spot with 20 minutes left.
Still the 10 men poured forward though as Juande Ramos stuck with three up front and Dimitar Berbatov struck the post before Ronaldo's clincher.
“I think it was a fantastic cup tie and both sides contributed to that,” Sir Alex told MUTV.
“It was quite an open match - we attacked and they also had some good chances. I think we also had great opportunities to create chances, although the final ball wasn’t so good at times today.
“I think Robbie Keane's goal woke us up a bit. We were looking a bit slack at the time - we were too relaxed and there was no intensity in our game.
“But we controlled most of the possession and put a lot hard work in - we had to against what was a good Tottenham side.
“I’m very happy. We were playing a top-flight team and, remember, they came bouncing into the game today on the back of a fantastic result against Arsenal.”
Sir Alex Ferguson recognised the role we played in Sunday's FA Cup 4th Round tie at Old Trafford.