Top-ranked Roger Federer has been drawn to face both U.S. Open champion Juan Martin del Potro and Andy Murray in the group round of the ATP World Tour Finals.
Federer, who lost to Del Potro in the U.S. Open final, will also face Fernando Verdasco in the round-robin phase in Group A.
Second-ranked Rafael Nadal was drawn into Group B with Novak Djokovic, Nikolay Davydenko and Robin Soderling.
The top two players in each group will advance to the semifinals of the season-ending tournament, which starts on November 22 at the O2 Arena in London. The final is set for November 29.