LONDON, Nov. 3 (Xinhua) -- Twice defending champion Novak Djokovic will meet Stan Wawrinka in round-robin play at this year' s ATP World Tour Finals to be held at The O2 Arena here from November 9-16.

World No. 2 Roger Federer will play Japan's Kei Nishikori in Group B.

Djokovic, who takes a 27-match winning streak indoors into the tournament, seeks to become the fifth player in history to win the season finale title four times (or more). The Serbian won the Masters Cup Shanghai title in 2008 and at the event in London in 2012 and in 2013. He will play against Australian Open titlist Wawrinka, Tomas Berdych of Czech Republic and US Open winner Marin Cilic of Serbia in Group A.

Federer, the 2003-04, 2006-07, 2010-11 champion, has a 44-11 match record at the prestigious tournament having first qualified in 2002. The Swiss, who has won 82 titles, will meet first-time qualifiers Nishikori and Milos Raonic of Canada in addition to Britain's Andy Murray in Group B.

Raonic beat Federer en route to last week's Paris Masters.