The No. 1 junior in 2005, Victoria Azarenka had a breakout year on tour in 2009, winning her first three singles titles, including Miami, and reaching the Top 10. She also reached the quarterfinals at both Roland Garros and Wimbledon. Nicknamed “Vika,” she’s known for her fiery temper on court. She won the 2007 U.S. Open mixed doubles title with countryman Max Mirnyi and the 2008 Roland Garros mixed title with Bob Bryan. She lives and trains in Scottsdale, Ariz. (as of Nov. 2, 2009)