Nadal emphasized that it was not the right moment to think about the ATP Finals in London in less than two weeks.

"I am enough sad to pull out from here. I feel like home here. It's very tough today for me. So it's not the right day to talk about London.

"The only thing I'm going to say is, that I'm going to do my treatment, do my best to play in London," he said.

Following Nadal's withdrawal, the Serbian qualifier Filip Krajinovic set up a clash with John Isner of the United States after making his first semi-final appearance at a ATP 1000 event.

Ninth-seeded Isner upset Juan Martin del Potro in full sets, and could clinch last spot at ATP Finals if he won the title in Paris. On the other hand, the Argentine Potro was set to miss the Finals.

【体坛英语资讯：Nadal withdraws from Paris Masters due to knee injury】相关文章：

★ 体坛英语资讯：Gatlin hires Landis lawyer to fight ban

★ 娱乐英语资讯：Craig trains for next Bond film

★ 娱乐英语资讯：Paul Newman responds cryptically to cancer reports

★ 体坛英语资讯：Yao for MVP already?

★ 体坛英语资讯：NBAs spectacular China games just the tip-off

★ 体坛英语资讯：FIFA lifts Iraq ban

★ 娱乐英语资讯：Britney Spears not to be charged for hit-run accident

★ 娱乐英语资讯：U.S.: celebrity passport info subject to sneak peeks

★ 体坛英语资讯：Bielsa comes back to take charge of Chile

★ 体坛英语资讯：Denmark coach appologizes for impolite behavior