top 10 debut Azarenka began the year at the Brisbane International as the second seed. She defeated Kateryna Bondarenko, Jarmila Groth, Lucie Šafářová, and Sara Errani, all in straight sets to reach her fifth career final. In the final, Azarenka defeated third seed Marion Bartoli to win her first WTA career title. Azarenka was seeded 13th at the Australian Open. She advanced to the fourth round for the first time, winning the first set against world No. 2 Serena Williams, before she retired citing heat stress. At the Cellular South Cup in Memphis, Azarenka was seeded second. She won her second WTA title by beating her doubles partner and top seeded Caroline Wozniacki in the final. Afterwards, Wozniacki and Azarenka won the doubles title, beating Michaëlla Krajicek and Yuliana Fedak in the final. At the BNP Paribas Open, Azarenka was seeded eighth and reached the semifinals, where she lost to her doubles partner and eventual champion Vera Zvonareva. Because of her performance at this tournament, Azarenka improved her singles ranking to a career-best world No. 10. She was the second woman from Belarus ever to be ranked that high, following Natasha Zvereva who was ranked world No. 5 in the late 1980s. At the Sony Ericsson Open in Key Biscayne, Florida, Azarenka was seeded 11th. She defeated world No. 1 and two-time defending champion, Serena Williams, in the final in straight sets. This was Azarenka's first Tier I or Premier Mandatory event title. Azarenka also became the sixth teenage female singles champion in the history of this tournament, with the others being Steffi Graf, Monica Seles, Martina Hingis, Venus Williams, and Gabriela Sabatini. By winning this tournament, Azarenka's ranking increased to a new career high of world No. 8. Her next tournament was on clay at the Porsche Grand Prix in Stuttgart, Germany, where she lost to Gisela Dulko in the second round. At the Italian Open, Azarenka lost to Svetlana Kuznetsova in the semifinals. At Roland Garros, Azarenka was seeded ninth. She ousted defending champion Ana Ivanovic in the fourth round, and advanced to her first Grand Slam quarterfinal, where she fell to top seed Dinara Safina in three sets. With her partner Elena Vesnina, Azarenka made the final of the ladies doubles at Roland Garros. In the final, they lost to the Spanish pairing of Garrigues and Ruano Pascual. She withdrew from her first match at the Aegon