Kirsten "Flipper" Flipkens (/ˈflɪpkənz/; born 10 January 1986) is a Belgian professional female tennis player. Her WTA career-high singles ranking is World No. 13, which she achieved in August 2013. She had success as a junior, winning the Girls' singles title at the 2003 Wimbledon Championships, and the 2003 US Open. Since then she has won one WTA singles title, 12 ITF singles titles, and one ITF doubles title. In 2012, she developed life-threatening blood clots which drastically reduced her ranking. Her comeback led to her best grand slam performance at the 2013 Wimbledon Championships, where she reached the semi-final, losing to the eventual champion, Marion Bartoli. On 22 December 2013, she won the award for Sportswoman of the Year in Belgium.