Second seed Nikolay Davydenko took just 71 minutes to polish off German opponent Philipp Petzschner 6-3 6-2 and book his place in the third round of the International German Open in Hamburg.
The former finalist will next meet last week's surprise Stuttgart winner Jeremy Chardy, of France, after the 15th seed survived two tight sets to defeat Andreas Beck 7-6 (7/2) 7-6 (8/6)
Third seed Robin Soderling also advanced with a 6-3 6-7 (3/7) 6-3 win over Italy's Fabio Fognini. The Swede will next play Nicolas Almagro in a repeat of last week's Bastad quarter-final.
Other second-round winners on Wednesday included sixth seed David Ferrer, who defeated German wild card Florian Mayer 6-3 6-2, and 11th seed Victor Hanescu, a 6-2 6-3 winner over Jan Hernych.
Russian Igor Andreev was the leading seed to fall, a 6-4 6-3 casualty against Julien Benneteau, while Spanish 12th seed Jose Acasuso retired when he trailed 6-1 1-1 to Juan Monaco.