Maria Yuryevna Kirilenko-Stepanova ( ; born 25 January 1987) is a Russian former professional tennis player. A junior Grand Slam champion at the 2002 US Open at the age of 15, she went on to become a top ten player in both singles and doubles. Kirilenko won six WTA singles titles and 12 doubles titles. She was a three Grand Slam singles quarterfinalist (reaching that stage at the 2010 Australian Open, the 2012 Wimbledon Championships, and the 2013 French Open), a semifinalist at the 2012 London Olmypics (where she lost to Victoria Azarenka in the bronze medal match), and reached a career-high ranking of world No. 10 on 10 June 2013. In women's doubles, she became ranked as high as No. 5 in the world on 24 October 2011, and reached two Grand Slam finals, at the 2011 Australian Open with Azarenka and the 2012 French Open with compatriot Nadia Petrova. Along with Petrova, Kirilenko won the 2012 WTA Tour Championships in doubles and was a bronze medalist at the 2012 London Olympics.