Argentina's tennis player beat the favorite by partial Serb 6-7 (6), 7-5, 6-4 to advance to the second round, Davydenko, Djokovic and Venus Williams also made his move to the third round

Argentina's Gisela Dulko surprisingly eliminated on Thursday Serbian Ana Ivanovic, former French Open champion 6-7 (6), 7-5, 6-4 in a match in the second round at the Australia Open.

The Colombian Alejandro Falla continued in the tournament with a victory 6-4, 6-1, 6-3 win over Marcel Granollers.

With his first win in three matches against Ivanovic, Dulko becomes the third wheel, the first time he goes so far in this tournament.

Ivanovic, who came to be in first place in the world ranking, is pre-classifier twentieth this year at Melbourne Park after a mediocre 2009. In 2008 he fell in the Australia Open final against Maria Sharapova.

Dulko served for the match twice in the third sleeve, but his opponent broke his serve, and Argentina broke Ivanovic's serve when they were 4.5 while serving to stay in the match. He finally won on his sixth match point.

Meanwhile, Venus Williams, playing his 10 Open in Australia, also came to the third round with a victory 6-2, 7-5 win over Sybille Bammer of Austria. Williams has won seven Grand Slam titles, but only reached a final in Australia in 2003 when losing to sister Serena.

Among men, the third-seeded Novak Djokovic overcame early problems to Swiss Marco Chiudinelli, to beat him 3-6, 6-1, 6-1, 6-3. Djokovic committed nine double faults and 52 unforced errors against a player who was in his first Open in Australia.

Djokovic will play in the next round with the Uzbek Denis Istomin, who beat German Michael Berrer 7-5, 6-3, 6-4.

The sixth-seeded Nikolai Davydenko, of Russia, won 6-3, 6-3, 6-0 to Ukrainian Illya Marchenko in the same quiet way that has characterized his streak of 11 victories.

The tennis player of 28 years is the prominence of a Federer or Nadal, and has never reached the final of a Grand Slam tournament, but nobody has played better in recent weeks.

Davydenko dominated Marchenko to extend a streak that has included titles in the World Tour Finals and the Doha tournament, first 2010.

In other matches of the day, Marcos Baghdatis, a finalist here four years ago, had problems with cramps, but defeated the Spanish David Ferrer 4-6, 3-6, 7-6 (4), 6-3, 6 -- 1, and another Spanish, Nicolas Almagro beat German Benjamin Becker 6-4, 6-2, 3-6, 4-6, 6-3.

In women's play, Denmark's Caroline Wozniacki advanced with a 6-3 victory, 6-1 over Julia Goerges, Germany, and will face Israel's Shahar Peer, winner of Bulgaria's Tsvetana Pironkova 6-1, 6-4.

Other women who advanced were: Victoria Azarenka of Belarus, Vera Zvonareva, of Russia, Poland's Agnieszka Radwanska, China's Li Na of China and the Spanish Carla Suarez Navarro.