The injury nightmares of Rafael Nadal have caught up with him again; a development that has forced his withdrawal from the ATP Finals.

The Spaniard was severely hampered by his knee injury during a three-set defeat to David Goffin.

Goffin beat the limping world number one 7-6 (7/5) 6-7 (4/7) 6-4 at London's O2 Arena and, after the match, Nadal announced he would be pulling out of the tournament.

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It is the sixth time Nadal has withdrawn from this competition in 13 years of qualifying and he will now be replaced by fellow Spaniard Pablo Carreno Busta.

"I am off. My season is finished," Nadal said less than half an hour after his match had concluded.

"I tried hard. I did the thing that I had to do to try to be ready to play. But I am really not ready to play, no?

"I really fought a lot during the match but knew that there was probably a big chance to be the last match of the season. That's what it is going to be.

"It is not a decision at all, it's about the pain. I cannot hold with enough power to keep playing. I tried, but seriously (it) was a miracle to be very close in the score during the match."

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