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The Red Devils have been easy on the eye this season and their fluid attacking play has at times been a joy to watch. They have scored more goals than any other side in the division and their emphatic lead at the top of the table fully emphasises their dominance over their title competitors.
But at the back, things have not been so rosy. In the first 19 games of the season, United conceded 28 goals, which works out at an average of 1.47 per match. That's their worst defensive record in 11 years.
David de Gea was shaky and unassured, and found himself heavily rotated alongside Anders Lindegaard as Ferguson sought a way to plug the leaks. Patrice Evra, Jonny Evans and Rio Ferdinand all looked far from solid, and if it wasn't for United's mean streak in front of goal, the Reds could have paid a bigger price this season for so frequently shooting themselves in the foot.
Though the table toppers have since enjoyed something of a renaissance at the back since January, conceding only 10 goals since the turn of the year, these defensive frailties cannot be forgotten. They will still need addressing over the summer if United are to continue to be competitive in the new season.