Tomas Berdych dumped out in St Petersburg

The former Wimbledon finalist was beaten by Italy's Simone Bolelli in straight sets, 7-6(5) 6-4.

Second seed Milos Raonic had not such trouble, beating Russia's Evgeny Donskoy 6-4 6-4, while fourth and fifth seeds Roberto Bautista and Tommy Robredo also enjoyed wins, the latter beating Cypriot veteran Marcos Baghdatis 7-5(5) 6-1.

Simone Bolelli (Italy) beat 1-Tomas Berdych (Czech Republic) 7-6(5) 6-4

2-Milos Raonic (Canada) beat Evgeny Donskoy (Russia) 6-4 6-4

Denis Istomin (Uzbekistan) beat Benjamin Becker (Germany) 2-6 7-6(5) 6-4

5-Tommy Robredo (Spain) beat Marcos Baghdatis (Cyprus) 7-6(5) 6-1

Lucas Pouille (France) beat Jerzy Janowicz (Poland) 7-6(8) 7-6(1)

4-Roberto Bautista (Spain) beat Teymuraz Gabashvili (Russia) 6-3 5-7 7-5