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Roger Federer tests injured back during first practice in Lille

Roger Federer had his first hitting session of the week in Lille, France, on Wednesday evening, taking to the clay court at the Stade Pierre Mauroy. Federer was forced to withdraw before the title match at the ATP World Tour Finals on Sunday due to an injured back, which has left a cloud over his status for this weekend's Davis Cup final against France.

Watch: Federer's wife called Wawrinka a "cry baby" in London

The draw for the weekend competition is on Thursday and play begins with singles on Friday. 

See some photos and video of Federer's light hit below:

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