Defending champion Lukas Rosol reached the Nastase Tiriac Trophy quarterfinals with a 6-2, 6-4 victory over eighth-seeded Jarkko Nieminen of Finland on Wednesday.
The Czech saved seven of the eight break points he faced on the clay at BNR Arenas.
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Home favorite Victor Hanescu failed to advance, though, as fourth-seeded Gilles Simon of France rallied from a set down to win 2-6, 6-3, 6-3.
In other matches, top-seeded Grigor Dimitrov of Bulgaria defeated Jiri Vesely of the Czech Republic 7-6 (5), 6-2, while Ukraine’s Sergiy Stakovsky downed Carlos Berlocq of Argentina 4-6, 7-6 (5), 6-2 in a match lasting 2 hours, 21 minutes.