Part of complete coverage on
Australian Open: Victoria Azarenka falls to Agnieszka Radwanska
January 22, 2014 -- Updated 1322 GMT (2122 HKT)
World No. 2 Victoria Azarenka had taken the women's title at Melbourne Park in each of the past two years.
- Defending champion Victoria Azarenka beaten by Agnieszka Radwanska at the Australian Open
- World No. 2 Azarenka has taken the title at Melbourne Park in each of the past two years
- Fifth seed Radwanska will play Slovakia's Dominika Cibulkova in the semifinals
- Cibulkova beat Romania's Simona Halep to reach the last four
Follow us at @WorldSportCNN and like us on Facebook
(CNN) -- The Australian Open is known as the "Happy Slam." The players are usually re-energized after the off-season and gush over the way the tournament is organized.
But for the fourth day in a row in Melbourne, a multiple grand slam winner left the tournament without a smile on their face.
Following Serena Williams, Maria Sharapova and Novak Djokovic, two-time women's defending champion Victoria Azarenka became the latest big name bundled out when the Belorussian fell to Agnieszka Radwanska on Wednesday.
Yes, the upsets keep coming.
Eugenie Bouchard scored a shock victory over 14th seed Ana Ivanovic to reach the semifinals of her first Australian Open. The Canadian came back from one-set down 5-7 7-5 6-2.
Bouchard the Belieber
Li Na faced a battle to stay cool and to stay in the Australian Open against Lucie Safarova.
Australian Open hots up
Radwanska not only defeated Azarenka in the quarterfinals to snap a seven-match losing streak against the world No. 2 but she didn't drop a game in the third set of the 6-1 5-7 6-0 victory.
When Azarenka misfired to seal her fate on match point, the crowd at Rod Laver Arena roared its approval.
With Djokovic departing Tuesday at the hands of Stanislas Wawrinka, it marked the first time in the Open Era both the men's and women's defending champions in Australia were eliminated at the quarterfinal stage.
"I think about today's match, what I did, what I could do better," Azarenka told reporters. "But other players, different vibe, whatever, I don't really care about that."
World No. 2 Novak Djokovic has won the season's first grand slam in each of the past three years. But not this year..
Wawrinka ends Djokovic's Australian Open reign
Read: Bouchard the "Belieber" reaches semifinals
Radwanska meets Dominika Cibulkova in the semifinals Thursday after the diminutive Slovak -- who sent Sharapova packing -- cruised past maiden grand slam quarterfinalist Simona Halep 6-3 6-0.
"This is for sure one of the greatest matches at the slam, especially here," Radwanska told reporters. "(Azarenka) is playing great tennis here.
"Especially the third set was unbelievable. I really cannot complain about anything."
Li Na, the only grand slam champion in the women's semifinals and twice the Australian Open runner-up, battles Canadian upstart Eugenie Bouchard in the other semifinal.
Read: Tennis legends take on star pupils
Blog: Five future tennis stars to watch
Part of complete coverage on
August 21, 2014 -- Updated 1252 GMT (2052 HKT)
As a player he was as fiery as his hair -- and as Novak Djokovic's coach, Boris Becker says he has to battle to keep his emotions in check.
August 20, 2014 -- Updated 1102 GMT (1902 HKT)
Tennis great Boris Becker says he was stunned by the level of criticism he received after being appointed as Novak Djokovic's coach.
July 25, 2014 -- Updated 1101 GMT (1901 HKT)
"I didn't cry once when I practiced in front of the mirror," says Martin Emmrich. But the nerves kicked in when he got down on one knee on court.
June 30, 2014 -- Updated 1135 GMT (1935 HKT)
When Agnieszka Radwanska refused to look her opponent in the eye after losing at Wimbledon, it raised more than eyebrows.
June 23, 2014 -- Updated 0114 GMT (0914 HKT)
It's 10 years since a teenage Maria Sharapova became the darling of Wimbledon's hallowed Center Court, launching herself as a star.
Rafael Nadal is still the "King of Clay" -- but his crown has slipped a bit, says CNN's Will Edmonds.
May 23, 2014 -- Updated 0746 GMT (1546 HKT)
He's regularly voted France's favorite famous person, but many of the nation's youth have "no idea" about his glorious sporting past
May 5, 2014 -- Updated 2359 GMT (0759 HKT)
The Ukrainian-born, British tennis star loses fight against liver cancer, just a few weeks after revealing that she was battling the disease.
April 29, 2014 -- Updated 1555 GMT (2355 HKT)
Five-time grand slam champion Martina Hingis has followed her mom into a coaching role, setting up a new tennis academy in Barcelona, Spain.
April 16, 2014 -- Updated 1238 GMT (2038 HKT)
It's no easy matter becoming a world class tennis player. It's even harder when everyone (really -- everyone) is calling you the "new Martina Hingis."
April 2, 2014 -- Updated 1420 GMT (2220 HKT)
At the 2009 Australian Open, French men's tennis was the talk of the town.
April 15, 2014 -- Updated 1800 GMT (0200 HKT)
Rafael Nadal may be most at home on a clay tennis court, but he has always found comfort on the sea.
Today's five most popular stories