Defending champion Novak Djokovic has been drawn in the same group as Roger Federer for next week’s World Tour Finals in London.
The pair will also be up against Juan Martin del Potro and Richard Gasquet in Group B at the O2 Arena.
World number one Rafael Nadal will play in the tournament, which starts on Monday, for the first time since 2011.
He heads Group A, which also features David Ferrer, Tomas Berdych and Stanislas Wawrinka.
Switzerland’s Wawrinka, the world number eight, was the first man to arrive at the O2 after losing to Djokovic in Paris on Friday.
Asked about being drawn with Nadal, against whom he has a 0-11 record, Wawrinka said: “It’s the top eight so it can only be tough but Ferrer and Berdych, I already beat them.
“Rafa is a different story but I’m quite excited to start the tournament. It’s the best atmosphere, I think.
“[The other players] all say it’s amazing to walk on the court, every match is sold out and it’s a really different tournament.”
