In-form Janko Tipsarevic
cruised into the second round of ATP St Petersburg with a straightforward win over Belgium's Olivier Rochus
Second seeded Serbian Tipsarevic, who after years of struggling to record his first ATP Tour victory has won two titles in the past month, needed 94 minutes to beat Rochus 6-2 7-5.
Sixth seed Marcel Granollers lost his opening match, however, with the Spaniard losing 3-6 6-4 7-6(4) in a three-hour epic against local hope Igor Andreev to the delight of the home crowd.
Andreev will play Andreas Seppi in round two, the Italian having beaten Vasek Pospisil of Canada 7-5 7-6(4).
Philipp Kohlschreiber of Germany also made the second round with a 6-7(4) 6-3 6-1 win over Carlos Berlocq of Argentina.
Meanwhile, local hero Mikhail Youzhny - seeded fifth - is safely into the quarter-finals after fighting past France's Julien Benneteau 6-4 3-6 6-2.
France's Adrain Mannarino is also in the last eight after beating Czech Lukas Rosol 6-2 7-6(5).