Defending champion Stan Wawrinka withdrew from next week’s Tokyo event due to a back injury, the tournament announced today.
The World No. 3 Wawrinka has already clinched a berth in the season-ending finals in London.
The tournament also lost Juan Martin del Potro. Two-time champion Kei Nishikori will be the top seed at the event. Gael Monfils, Marin Cilic and Tomas Berdych are also in the field.
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