Australian Open champion Stan Wawrinka is the fourth man to qualify for next month's eight-player World Tour Finals, the ATP have confirmed.
Wawrinka is the second Swiss into the elite field after compatriot Roger Federer, who booked his spot weeks ago along with Novak Djokovic and Rafael Nadal.
The last four places in the event at the O2 arena will be contested from Monday over the last three weeks and six events of the regular ATP season.
Wawrinka reached the London semi-final last year at his debut at the year-end spectacular.
"I'm extremely happy to be back in London," Wawrinka said. "It was my dream and goal to qualify again this year after the great experience in 2013.
"It's only my second time at the World Tour Finals and being part of this great event remains a childhood dream for me.
"The atmosphere in London is one of a kind and it means a lot to me to be there together with the very best players of the world."
Next candidates fighting for spots in the qualifying queue are US Open finalist Kei Nishikori, New York champion Marin Cilic, Czech Tomas Berdych, Canada's Milos Raonic, Spain David Ferrer, Brit Andy Murray and Grigor Dimitrov of Bulgaria.
As the only not-yet-qualified grand slam champion, Croatian Cilic will automatically earn the fifth spot next week, unless Berdych wins the Stockholm title or Raonic lifts the trophy in Moscow.
Nishikori is not in action next week, but Ferrer and Murray are both looking to add points as wild cards and the top two seeds in Vienna; Dimitrov is the defending champion in Stockholm.
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