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If Rooney stays fit I think United will edge it this season again but it's very tight. Both sides have good squad depth which will help in a long hard campaign

Chelsea will win it,although there may not be much in it as United get stronger as the season goes on.
The key for Manchester United is that they keep their defensive players fit for the rest of the campaign.They still look a little lightweight in the attacking side of things and only Rooney is really keeping them in it.

Chelsea look that bit stronger in defence and midfield,and probably up front aswell,with not only Didier Drogba being a constant threat,but also Nicolas Anelka.
It should be interesting.