File photo of Naomi Osaka. Photograph:( Reuters )
The 20-year-old is the third player to confirm her qualification for the event.
US Open champion Naomi Osaka secured a berth at the WTA finals, scheduled to take place at the Singapore Indoor Stadium from 21-28 October.
The 20-year-old, who became the first Japanese player to win a Grand Slam singles tournament after defeating Serena Williams in straight sets in New York last month, is the third player to confirm her qualification for the event.
World No. 1 Simona Halep and No. 3 Angelique Kerber have qualified ahead of Osaka.
"Qualifying for the WTA Finals is a huge accomplishment," said Osaka.
The Japanese tennis star defeated Frenchwoman Caroline Garcia to win a junior version of the Singapore tournament and will be returning for the first time as a senior.
"Winning the WTA Rising Stars Invitational in 2015 helped give me the confidence to play on the big stages, so I am excited to go back to Singapore and compete with the top players of the season," she added.
It would be Osaka's maiden appearance in the WTA Finals singles competition, which features only the top eight players of the women’s tennis season.