India's top singles player Somdev Devvarman has been handed a direct entry into the main draw of the ATP Chennai Open tennis tournament, which begins on the 30th of this month.World number 90 Somdev was to play in the qualifying round of the tournament, but Estonia's Jurgen Zopp's withdrawal due to a back injury ensured a berth in the main round for Somdev.The Chennai Open will witness top stars like Switzerland's world number eight Stanislas Wawrinka, world number 15 Mikhail Youzhny of Russia, world number 16 Italian Fabio Fognini and defending singles champion of Serbia, Janko Tipsarevic.This year, 28-year-old Somdev broke into top 100 after an impressive run. In the space of 10 months, he climbed more than 550 spots to be at number 90 in ATP Rankings.