"medical reasons"

This is from the ATP

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Rafael Nadal has withdrawn from next week’s BNP Paribas Masters for medical reasons. The Spaniard will discuss his withdrawal when he appears on site in Bercy for a media conference on Sunday or Monday.

Nadal, who was a finalist at the BNP Paribas Masters in 2007 and a semi-finalist last year, has played 18 consecutive ATP World Tour Masters 1000 tournaments and in 33 of the past 35 Masters 1000s. The Spaniard last played three weeks ago, when he fell to Jurgen Melzer in the third round of the Shanghai Rolex Masters.

Nadal, who has already clinched the year-end No. 1 South African Airways 2010 ATP World Tour Ranking after a banner year in which he won three Grand Slam titles, is next scheduled to play at the Barclays ATP World Tour Finals at London’s O2, from 21-28 November.