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.