She has won several junior tournaments (including the 2006 Wimbledon girls' singles tournament and the 2005 Orange Bowl tennis championship), and made her debut on the Sony Ericsson WTA Tour at Cincinnati's Western & Southern Financial Group Women's Open on July 19, 2005, losing to the top-seeded and later champion Patty Schnyder in the first round.
2006
In 2006, she was the first seed at the Australian Open (junior girl's singles), but lost the final to eight-seeded Anastasia Pavlyuchenkova of Russia 1–6, 6–2, 6–3. She was seeded second with Anna Tatishvili in the doubles tournament, but the pair was knocked out in the semifinals by the French-Italian pair of Alizé Cornet and Corinna Dentoni, who were seeded eighth.
In February in Memphis, she reached her first WTA Tour quarterfinal, beating Kristina Brandi and Ashley Harkleroad in the first two rounds before losing to third-seeded Sofia Arvidsson of Sweden.
At Wimbledon girls final.
Before Wimbledon, Wozniacki won the Liverpool International Tennis Tournament beating Ashley Harkleroad in the finals.
Later that year, she was given a wildcard to the 2006 Wimbledon Championships senior qualifying tournament, where she was beaten in the first qualifying round by Miho Saeki 3–6, 6–2, 6–3. However, Wozniacki went on to win the girls' singles tournament, beating Slovak Magdaléna Rybáriková in the final 3–6, 6–1, 6–3.
In August, she reached another WTA Tour quarterfinal, this time at the Nordea Nordic Light Open in Stockholm. She defeated top 100 players Iveta Benešová and Eleni Daniilidou before falling to eventual champion and third-seeded Jie Zheng.
Wozniacki was seeded second in the year's last major tournament, the 2006 U.S. Open - Girls' Singles. In the first round on September 3, she won the first set against Russian Alexandra Panova, but was disqualified in the second set for verbally abusing an umpire. Wozniacki was said to have used an expletive in referring to a linesman who made a disputed call;[6] however, on her blog, she claimed to say "take your sunglasses of " and to be mistaken for talking to the linesman when she was criticizing herself after the next point.
In her last junior tournament, the Osaka Mayor's Cup, she won the girls' singles and doubles.
Her first senior title came shortly after on October 29, when she won the $25,000 ITF-tournament in Istanbul by beating Tatjana Malek in the final 6–2, 6–1.
Wozniacki was set to face Venus Williams on November 27 in an exhibition match in Copenhagen, but five days before the event, Williams canceled because of an injury. The two did, however, face each other in the Memphis WTA Tier III event on February 20. Williams beat Wozniacki 6–4, 6–4, ending the nine-match winning streak Wozniacki had at the time.
On November 30, Wozniacki was named ambassador for Danish Junior Tennis by the Culture Minister of Denmark at the time, Brian Mikkelsen.
2007
On February 4, she won the singles title in Ortisei, Italy, at an ITF $75,000 tournament, beating the Italian player Alberta Brianti 4–6, 7–5, 6–3. On March 4, she won the $75,000 ITF tournament in Las Vegas, beating top-seed Akiko Morigami in the final 6–3, 6–2.
She obtained a wild card for the 2007 Pacific Life Open main draw and made her Tier I-debut there. She was knocked out in the second round by Martina Hingis 6–1, 6–3. The two faced each other again on April 27 in Copenhagen for an exhibition match, where Wozniacki again lost 7–6(7), 3–6, 6–2.
She then made the semifinals of the AIG Open in Tokyo in October, her first career semifinal and also the first Danish woman to reach a WTA semifinal since Tine Scheuer-Larsen in 1986 at Bregenz. Wozniacki lost to Venus Williams 6–3, 7–5.
2008
At 2008 U.S. Open.
On January 2, Wozniacki participated in an exhibition tournament in Hong Kong. She lost her first match to former World No. 1 Maria Sharapova 6–2, 6–2. But she won the doubles event with her partner, the singles champion Venus Williams. At the Australian Open, she defeated Gisela Dulko, 21st seed Alyona Bondarenko on her way to the Round of 16 where she lost to the eventual finalist and fourth-seeded Ana Ivanović, 6–1, 7–6.
At the Qatar Total Open in Doha, Wozniacki defeated 8th seed Marion Bartoli in the second round before losing in the quarterfinals to the eventual champion Maria Sharapova, 6–0, 6–1. Following that, she played in the Cellular South Cup in Memphis, where lost again in the quarterfinals to the eventual champion, Lindsay Davenport, 6–0, 6–2.
Wozniacki then took parts in two Tier I tournaments in North America. At the Pacific Life Open in Indian Wells, she defeated 18th seed Maria Kirilenko en route to the fourth round where she lost to the eventual runner-up Svetlana Kuznetsova, 6–2, 6–3. She then lost again in the fourth round of the Sony Ericsson Open in Miami to Venus Williams, 6–3, 6–3, having taken out two seeded players in Bartoli and Katarina Srebotnik prior.
During the clay-court season, Wozniacki took part in three events in the lead up to the French Open. At the Bausch & Lomb Championships in Amelia Island, Florida, she lost in the second round to Alyona Bondarenko 6–3, 3–6, 6–3. At the Tier I Qatar Telecom German Open in Berlin, she fell to Gisela Dulko 6–2, 7–5, again in the second round. She lost in the quarter-finals of the Tier I Internazionali BNL d'Italia in Rome to newly crowned World No. 1 Sharapova 6–4, 7–6(3).
At the French Open, she was seeded thirtieth, making this the first Grand Slam tournament in which Wozniacki was seeded. She lost however in the third round to the eventual champion and World No. 2 Ana Ivanović, 6–4, 6–1.
During the grass-court season, Wozniacki took part in the exhibition tournament at the Liverpool International. She won the event, defeating Ashley Harkleroad in the final. In her next tournament at the International Women's Open in Eastbourne, Wozniacki claimed her first ever top 5 scalp, defeating the top seed and World No. 4 Svetlana Kuznetsova 6–2, 6–2 in the second round before losing to Samantha Stosur in the quarterfinals, 7–6(3), 6–4. At Wimbledon, she reached the third round but lost to second-seeded Jelena Janković 2–6, 6–4, 6–2.
In her next tournament at the Gastein Ladies in Bad Gastein, she lost in the second round to Mariya Koryttseva, 6–4, 4–6, 7–6(3). She then reached the semifinals at the Banka Koper Slovenia Open in Portorož, losing 6–4, 6–4 to the eventual champion, Sara Errani. Wozniacki won her first ever WTA tour title at the Nordic Light Open in Stockholm without losing a single set, defeating Vera Dushevina, 6–4, 6–4. She had previously beaten the no. 5 seed Anabel Medina Garrigues in the quarterfinals and the top seed and World No. 10, Agnieszka Radwańska, 6–4, 6–1 in the semifinals.
At the Summer Olympics in Beijing, she beat World No. 12 Daniela Hantuchová in the second round 6–1, 6–3, before falling to the eventual gold-medalist Elena Dementieva, 7–6(3), 6–2. Wozniacki then won the second WTA tour title at the Pilot Pen Tennis in New Haven, defeating four seeded players in the form of Dominika Cibulkova, Marion Bartoli and Alizé Cornet en route to the final. There, she defeated World No. 11 Anna Chakvetadze 3–6, 6–4, 6–1.
She 21st at the U.S. Open, she defeated World No. 14 Victoria Azarenka 6–4, 6–4 in the third round. This was her 15th win in the last 16 matches. In the fourth round, she lost to second-seeded and eventual runner-up Janković 3–6, 6–2, 6–1, her fourth loss of the year to a Serbian in a Grand Slam tournament.
Wozniacki suffered a first round exit at the Toray Pan Pacific Open in Tokyo to Katarina Srebotnik, 6–1, 6–2. At the China Open, she lost her opening match again, 7–6, 6–4 to Anabel Medina Garrigues. She teamed up with Media Garrigues however to clinch the doubles title, defeating the Chinese duo of Han Xinyun and Xu Yi-Fan in the final. It was Wozniacki's first WTA doubles title. At the Tier III AIG Japan Open Tennis Championships, she was the top seed for the first time on the WTA Tour. She won her third career title, defeating Kaia Kanepi of Estonia 6–2, 3–6, 6–1, in the final.
In the Tier I Kremlin Cup in Moscow, she beat eight-seeded Chakvetadze in the first round but had to retire due to sickness when trailing 6–4, 3–2 to Nadia Petrova in the second round. She lost in the first round the following week at the final edition of the Zurich Open to Francesca Schiavone, 7–6(3), 6–2. In her last WTA tournament of the year, she reached the final at the Fortis Championships in Luxembourg, but lost against top seeded Dementieva 2–6, 6–4, 7–6(4).
Wozniacki then took part in an ITF tournament in her hometown in Odense. She won the tournament beating World No. 64 Sofia Arvidsson in the final 6–2, 6–1.
Her final win-loss record for the year (ITF matches included, exhibition matches not included) is 58–20 in singles and 8–9 in doubles. As of November 10, she is ranked at 12 in singles and 79 in doubles. She finished thirteenth in the race for the Sony Ericsson Championships. She also won the Newcomer of the Year award for 2008.
2009
In her first tournament of the year at the ASB Classic in Auckland, New Zealand, she lost in the quarterfinals to Russian Elena Vesnina 6–3, 0–6, 6–3. She then reached the quarter-finals of the Medibank International in Sydney where she lost to World No. 2 Serena Williams 6–7(5), 6–3, 7–6(3) despite having three match points when serving for the match at 6–5 in the third set. Seeded 11th at the Australian Open, Wozniacki advanced to the third round where she lost to Australian wild card Jelena Dokić 3–6, 6–1, 6–2.
Wozniacki reached the quarter-finals of the Pattaya Women's Open in Thailand but lost to 8th seeded Magdaléna Rybáriková 6-4, 6-1. Seeded first at the Cellular South Cup in Memphis, Tennessee, Wozniacki advanced to the final but lost to the Belarussian teenager Victoria Azarenka 6–1, 6–3. Afterwards, Wozniacki and Azarenka won the doubles title, beating Michaella Krajicek and Yuliana Fedak 6–1, 7–6(2) in the final.
Wozniacki then took part in the first two Premier Mandatory tournaments of the year in North America. At the BNP Paribas Open in Indian Wells, California, Wozniacki lost in the quarterfinals to eventual champion Vera Zvonareva 6–4, 6–2. At the Sony Ericsson Open in Miami, Wozniacki scored her first wins over 18th seeded Patty Schnyder and the 4th seed Elena Dementieva in the third and fourth rounds respectively. She lost to Svetlana Kuznetsova 6–4, 6–7(5), 6–1 in the quarter-finals.
Wozniacki won her first title of the year on the green clay of the MPS Group Championships in Ponte Vedra Beach. After surviving a tough first round encounter against Samantha Stosur, she then handily dispensed of Virginie Razzano and Daniela Hantuchová in straight sets to reach the semifinals where she survived four match points to defeat Elena Vesnina 2–6, 6–3, 7–6(5). She then defeated Canadian Aleksandra Wozniak in the final 6–1, 6–2. Seeded fifth on the green clay at the Family Circle Cup in Charleston, she defeated top seed Elena Dementieva 6–4, 5–7, 7–5 in the semi-finals before losing 6–2, 6–4 to Sabine Lisicki in the final.
Wozniacki then suffered early exits in her next two tournaments losing to Marion Bartoli 7–6(6), 6–4 in the second round at the Porsche Tennis Grand Prix in Stuttgart and losing in the third round of the Internazionali BNL d'Italia in Rome to Victoria Azarenka 6–2, 6–2. Wozniacki advanced to the final at the inaugural Premier Mandatory Mutua Madrileña Madrid Open where she lost to World No. 1 Dinara Safina 6–2, 6–4. Seeded 10th at the French Open in Paris, France, Wozniacki lost to Sorana Cîrstea of Romania, 7–6(3) 7–5. Cîrstea and Wozniacki lost in the first round of the doubles tournament to Maria Kirilenko and Flavia Pennetta, 6–4, 6–4.
During the grass court season, Wozniacki won her second title of the year at the AEGON International in Eastbourne. She advanced to the semi finals with defeats over Alisa Kleybanova, Samantha Stosur, and Ekaterina Makarova. There she faced near namesake Aleksandra Wozniak of Canada, recovering from a set down to win 2–6, 6–4, 6–4. She beat Virginie Razzano in the final 7–6, 7–5.[11]
Wozniacki was seeded 9th in Wimbledon, and faced Kimiko Date Krumm (20 years her senior) in the first round, winning in three sets. She then beat Maria Kirilenko, 6–0, 6–4, and the #20 seed Anabel Medina Garrigues 6–2, 6–2. She then crashed out to Sabine Lisicki in the fourth round, 6–4, 6–4.
On her 19th birthday she lost in the final of the Swedish Open 7–5, 6–4 to Maria Jose Martinez Sanchez of Spain. In her first hard-court tournament in preparation for the US Open, after receiving a bye in the first round of the LA Women's Tennis Championships she lost in the second round to Sorana Cîrstea 1–6, 6–4, 7–6(5). At the Cincinnati Masters, Wozniacki advanced to the quarterfinals, falling to Elena Dementieva 6–2, 6–1. In Toronto she lost in the second round to Zheng Jie 7–5, 6–3. She then went to defend her title at the Pilot Pen Tennis in New Haven. In the first round she had her first ever double bagel win, 6–0, 6–0 over Edina Gallovits in 41 minutes. In the final of the tournament she beat Russian challenger Elena Vesnina 6–2, 6–4 to win her third title of the season.
Wozniacki is the 9th seed at the US Open. She easily won her first three matches, 6–4, 6–1 over Galina Voskoboeva, 6–1, 6–0 over Petra Martić, and 6–3, 6–2 over her doubles partner Sorana Cîrstea. In the fourth round against reigning French Open champion Svetlana Kuznetsova, Wozniacki rallied from 3–1 down in the third set to win 2–6, 7–6(5), 7–6(3). She defeated giant-killer Melanie Oudin 6–2, 6–2 in the quarterfinals, and followed that up with a 6-3 6-3 win over fellow 19-year old Yanina Wickmayer in the semifinals. She is the first Danish woman to reach a Grand Slam final, where she will face unseeded Kim Clijsters. The runner-up showing will allow her to reach a career high ranking of No. 6, and if she wins the title she will rise to No. 4 in the world.
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