Juan Martin del Potro books his place at next month's ATP World Tour Finals in London.
Juan Martin del Potro has become the sixth player to qualify for next month's ATP World Tour Finals in London.
The Argentine's place was sealed after it was confirmed that Rafael Nadal would not be competing at the season-ending tournament while he recovers from a knee injury.
"For me it's a gift for my effort during the year," said Del Potro.
"Being in that tournament means a lot. It's only eight players fighting for one tournament. It's the best eight players of the year, so it's very important to me. I'm so glad to be there once again."
Novak Djokovic, Roger Federer, Andy Murray, David Ferrer and Tomas Berdych will also be taking part in the event at the O2.
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