Ana Ivanovic's hopes of a return trip to the Australian Open final fell apart in a barrage of mistakes on Friday as Russia's Alisa Kleybanova ousted her 7-5, 6-7 (5), 6-2 in the third round.

With 19-year-old Kleybanova constantly aggressive, fifth-ranked Ivanovic lost her serve nine times and finished with 50 unforced errors to just 23 winners.

When it was over, Kleybanova dropped to both knees, pumped her fists and blew kisses at the crowd. Ivanovic appeared to be nearly in tears as she walked off court.

The Serb's loss came on a day that the late match between second-ranked Roger Federer against former No 1 Marat Safin - which the Swiss star won in three sets - was supposed to produce the biggest news.

Instead, ethnic violence erupted between nationalist fans after Serbia's Novak Djokovic, the defending men's champion, beat Bosnian-born American Amer Delic.

One of several thrown chairs hit a woman and left her briefly unconscious though not seriously injured. Police said about 30 Bosnian and Serbian youths were ejected from Melbourne Park. Two men were charged with riotous behavior and a third was fined on the spot.

This was what organizers had feared when they announced before the tournament that they were instituting a no-tolerance policy for disruptions.

They wanted the focus on tennis - such as Kleybanova's upset victory, Andy Roddick's 22 aces while winning in straight sets or top-ranked Jelena Jankovic and No 3 Dinara Safina advancing.

Instead of talking about how defending champion Djokovic reached the third round with a 6-2, 4-6, 6-3, 7-6 (4) victory packed with drama and good sportsmanship - the 21-year-old Serb and Bosnian-born Delic were mostly quizzed about the chaotic scene that followed, when their supporters clashed outside near a big-screen TV showing the match.

"There's absolutely no place for that here. This is a tennis match," said Delic, who attended the University of Illinois and lives in Jacksonville, Florida. "As I'm sure you all saw at the end, Novak and I are friends. We're both competitors. In the end it was a fair match, and there was no reason for such things."

Before finally asking reporters to change the subject, Djokovic lamented that players can't control their fans. Delic had earlier used his website to ask his backers, who were boisterous to the point of disruption in the qualifier's first two matches, to tone it down.

And that wasn't even all of the day's drama - a man was arrested after dancing across a court, naked from the waist down, as Serena and Venus Williams won a second-round doubles match.

The rematch of the 2005 men's semifinal here, won by Safin en route to the championship, was dominated by Federer, who again looked sharp in his pursuit of a 14th Grand Slam title that would tie Pete Sampras' record, winning 6-3, 6-2, 7-6 (5).

Federer never faced a breakpoint, and the mercurial Safin's growing frustration nearly boiled over when he was called for a foot-fault on his second serve. That gave him a double-fault and Federer a 4-1 lead in the third-set tiebreaker. Safin rallied to lead 5-4 before Federer ran off the last three points, the last on a backhand winner down the line.

"He gave me quite a few free points in the first two sets, but after that he got tougher," Federer said. "I'm pretty lucky I got through in three."

Safin has said he is unlikely to continue playing after this year. Federer clearly would miss him.

"I always like to play Marat," Federer said. "We go back, we like playing each other. It doesn't matter who wins."

Roddick had a 6-3, 6-4, 6-2 win over Fabrice Santoro and next plays No 21 Tommy Robredo of Spain, who beat Taiwanese player Lu Yen-Hsun.

No 8 Juan Martin del Potro of Argentina extended his winning streak to seven matches, and No 19 Marin Cilic of Croatia ousted No 11 David Ferrer of Spain.

On the women's side, unseeded Jelena Dokic, a former Wimbledon semifinalist making her first appearance in the main draw of a Grand Slam after a three-year absence, knocked off a seeded player for the second straight round, ousting No 11 Caroline Wozniacki of Denmark.

(Agencies via China Daily January 24, 2009)