CHENNAI, India -- Top-seeded Nikolay Davydenko defeated Daniel Koellerer 6-2, 6-3 Tuesday to advance to the second round of the Chennai Open.
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Second-seeded Stanislas Wawrinka of Switzerland didn't fare as well, losing 6-4, 6-1 to Flavio Cipolla.
Ivo Karlovic and Carlos Moya, a two-time Chennai Open winner, also advanced. Karlovic defeated American Rajeev Ram 6-4, 6-3, and Moya needed a tiebreaker to overcome Thailand's Danai Udomchoke 6-3, 7-6 (4).
Davydenko held serve throughout the match, but the fifth-ranked Russian wasn't completely satisfied with his performance.
"The early matches of the new season are always tricky, irrespective of who you are playing against and where you'd finished last year," said Davydenko, who won three titles last year. "My service was OK, but I wasn't pleased with my baseline game and kept waiting for my opponent to make mistakes."
Davydenko will face wild card Lukas Dlouhy of Czech Republic, who needed three sets to defeat Go Soeda of Japan on Monday.
The 138th-ranked Cipolla said he benefited from playing in the qualifying tournament. Wawrinka returned to competitive tennis for the first time this season.
"Our only previous encounter was in the U.S. Open, where I lost a very tight match to him after leading by two sets," Cipolla said. "I was confident from the beginning and knew that I could beat him."
Also, seventh-seeded Janko Tipsarevic of Serbia beat Pablo Andujar of Spain 6-3, 6-2; Denis Istomin of Uzbekistan defeated Rohan Bopanna of India 6-4, 7-6 (3); and Andreas Beck of Germany beat Roko Karanusic of Croatia 6-1, 6-0.
Indian wild card Somdev Devvarman defeated American Kevin Kim 6-3, 6-3, while Czech player Ivo Minar cruised past American Wayne Odesnik 6-3, 6-0.