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Vienna - South Africa's Kevin Anderson has reached the quarter-finals of the Erste Bank Open after defeating Marcos Baghdatis of Cyprus.
The sixth-seeded Anderson won in straight sets, 6-2, 7-6 (7/5).
Juan Martin Del Potro of Argentina also reached the quarter-finals after he defeated Philipp Petzschner of Germany 6-3, 6-4 to reach his seventh quarter-final of the season.
Del Potro, who is seeking one of three remaining spots at next month's ATP finals, saved four break points in the opening set but held serve throughout against Petzschner, who won his only tour title here three years ago.
"His game for me is very difficult because I am a taller player and he played too much drop shots and slices," said Del Potro, who had a bye in the first round. "So I am happy to beat him. But I need to play better if I want to win more matches."
Del Potro will play either Tommy Haas of Germany or qualifier Aljaz Bedene of Slovenia for a place in the semi-finals.
"Tommy is a very experienced player, that would be tough a match," Del Potro said.
In first-round play, Steve Darcis of Belgium rallied to upset No 7 Nikolay Davydenko of Russia 3-6, 6-0, 7-6 (2). Davydenko, coming off a semi-final in Moscow last week, lost a 4-0 lead in the deciding set and failed to serve out the match at 5-4 and again at 6-5.
"My serve was not good in the first set but I played well after settling down," Darcis said. "I am over the moon with this win as Davydenko is still a world-class player."
Also, Jarkko Nieminen of Finland defeated Robin Haase of the Netherlands 7-6 (3), 6-4 to set up a second-round match against top-seeded Frenchman Jo-Wilfried Tsonga.
Results on Wednesday at the Erste Bank Open, an ATP tour event on indoor hard courts at the Wiener Stadthalle (seedings in parentheses):
Singles
First Round
Jarkko Nieminen, Finland, def. Robin Haase, Netherlands, 7-6 (3), 6-4.
Steve Darcis, Belgium, def. Nikolay Davydenko (7), Russia, 3-6, 6-0, 7-6 (2).
Second Round
Juan Martin Del Potro (2), Argentina, def. Philipp Petzschner, Germany, 6-3, 6-4.
Kevin Anderson (6), South Africa, def. Marcos Baghdatis, Cyprus, 6-2, 7-6 (5).
