Elena Sergeevna Baltacha (Ukrainian: Олена Сергіївна Балтача; 14 August 1983 – 4 May 2014) was a Ukrainian-born British professional tennis player. Being a four-time winner of the AEGON Awards, she was also a long-term British No. 1, a position she held intermittently from 2002 to 2012. However, as a result of her absence from competition due to knee surgery, she dropped down the world rankings and at the time of her retirement on 18 November 2013, she was ranked as the world No. 221 and British No. 6. Her career-high ranking of world No. 49 was achieved in September 2010.