Rafael Nadal has confirmed he will not play again this season and says he will undergo appendix surgery next month.
The 14-time Grand Slam title winner will therefore miss November's ATP World Tour Finals in London.
Nadal, 28, made his announcement after losing 6-2 7-6 (7-4) to Croatian teenager Borna Coric in the quarter-finals of the Swiss Indoors on Friday.
"I'm not going to Paris and London - I'm not competitive enough," the nine-time French Open champion said.
"I am going to have surgery on 3 November."