Anne Viensouk Keothavong Bretherton (née Keothavong; born 16 September 1983) is a retired British tennis player. During her career, she won a total of 28 titles on the ITF Women's Circuit, and reached a career-high singles ranking of world No. 48 (achieved on 23 February 2009). She also reached the semifinals of six WTA International tournaments, and the semifinals of one Premier tournament. Anne was British No. 1 at the year-end rankings five times, and in 2009 became the first British player to make the WTA top 50 since 1993. In April 2001, aged 17, she became, until Katie Swan in 2016, the youngest player ever to play in the Fed Cup for Great Britain, and she is second (alongside Elena Baltacha) to Virginia Wade's record for most Fed Cup ties played for Great Britain with 39.