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.

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