Duo heading to India
World number six Tomas Berdych will headline the field for this year's Chennai Open, organisers have announced.
The Czech will be joined by fellow top-10 player Janko Tipsarevic in the season-opening event which gets underway on December 31.
The 15th-ranked Marin Cilic and world number 17 Stanislas Wawrinka are the other big names at the event.
Canadian Milos Raonic, the defending champion, will not be featuring this time around.