REFILE-Tennis-Venus pulls out of Madrid with back problem

Sun May 5, 2013 1:49pm BST

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MADRID May 5 (Reuters) - Former world number one Venus Williams has been forced to withdraw from the Madrid Open due to a back problem, organisers said on Sunday.

The 32-year-old American, now ranked 21, was due to play her first-round match against Spanish wild card Anabel Medina Garrigues on the clay at the premier event on Sunday.

She will be replaced in the draw by 56th-ranked Stefanie Voegele of Switzerland. (Reporting by Iain Rogers; Editing by John O'Brien)