Sir Alex Ferguson paid tribute to his Manchester United defence after they claimed a record-breaking 12th successive clean sheet in the 1-0 victory over Everton.
United have now not conceded a Premier League goal for 1,122 minutes - a new English league football record - and after goalkeeper Edwin van der Sar's latest clean sheet, the veteran Scot was delighted.
"It's a fantastic performance from the boys. I couldn't believe it when I read that the last goal we conceded was against Arsenal in October," he said.
"Van der sar brings calmness and assurance. Over the last 12 games we have changed the back four I don't know how many times so you have to give great credit to them."
Meanwhile, Ferguson admitted he was disappointed that his side had not scored more goals after Cristiano Ronaldo's decisive penalty on the stroke of half-time.
"You only need a second to lose a goal and in a situation like today, where Everton kept going and kept playing balls up to the edge of the box, that can happen," he continued.
"The aim of football is to kill teams when you've got them by the throat and we had Everton by the throat several times and didn't do that.
"Everton were very energetic and athletic and because we didn't score a second goal they were always going to carry on and keep fighting. They took us right to the wire."