| http://www.w3.org/ns/prov#value | - Before you all get carried away, Federer will have to worry about a few other challengers that are foaming at the mouth if given their shot to take him down.Here are the most formidable opponents that Roger will need to pay a little extra attention to in this Major.Novak DjokovicDjokovic has to be Federer's most formidable foe being that Novak is the defending champion of the US Open.
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