Andy Murray will play Czech Tomas Berdych in his opening match after being handed a difficult draw at the ATP World Tour Finals in London.
The Briton was placed in Group A, along with world number one Novak Djokovic, world number six Berdych and world number seven Jo-Wilfried Tsonga.
Murray plays Berdych at 13:45 GMT on Monday, before Djokovic meets Tsonga.
Roger Federer, David Ferrer, Juan Martin del Potro and Janko Tipsarevic have been drawn in Group B.
Last big tournament for a while so try to watch if you can. Should be some good tennis and some good beatdowns.