India's Somdev Devvarman and Yuki Bhambri join an impressive field of players this year, which includes four players from the Top 20 in the world. Apart from the Czech Republic's Tomas Berdych (No. 6), the grid includes Janko Tipsarevic (No. 9), twice winner Marin Cilic (No. 15) and Stanislas Wawrinka (No. 17).