Davydenko wins opening match in Austria

PORTSCHACH, Austria, May 23 (UPI) -- Top-seeded defending champion Nikolay Davydenko of Russia was among Tuesday's opening-round winners at the Hypo Group Tennis International in Austria.

Davydenko defeated Czech Tomas Zib 6-3, 6-0 for his sixth straight win at this event. He beat Austrian Jurgen Melzer in last year's finale in St. Poelten and was the runner-up in 2003.

Davydenko, World No. 6, takes on Spanish qualifier Ruben Ramirez Hidalgo on Wednesday. Ramirez Hidalgo posted a 4-6, 6-4, 6-3 victory over Ecuador's Nicolas Lapentti, the 2002 champion.

Argentine qualifier Juan Monaco upset fourth-seeded Russian Dmitry Tursunov 7-6 (7-4), 6-2.