To mark International Women's Day, we present a selection of the greatest female athletes in the world.
It's not a comprehensive list, and the order is alphabetical rather than on merit.
If we have left out someone you think deserves inclusion, please let us know in the comments!
Luciana Aymar (Argentina, Hockey): The greatest hockey player of all time. Seven-times World Player of the Year and four-times Olympic medallist.
Tora Berger (Norway, Biathlon): Managed almost complete dominance of the 2013 World Championships, winning four gold medals from six available.
Jessica Ennis (Great Britain, Athletics): Olympic heptathlon champion - the world's greatest all-around athlete.
Allyson Felix (USA, Athletics): Track star of London 2012, winning the 200m and two relay golds.
Missy Franklin (USA, Swimming): Star of London 2012, winning four golds in the pool aged 17.
Jacqueline Freney (Australia, Swimming): The Australian Paralympian won eight golds in the pool in London.
Tiki Gelana (Ethiopia, Athletics): Won the London 2012 marathon in an Olympic record time despite being knocked over earlier in the race.
Tina Maze (Slovenia, Alpine skiing): Won the World Cup with a record points total, winning races in every discipline.
Danica Patrick (USA, NASCAR): Her pole position at the recent Daytona 500 was the latest milestone of a pioneering career.
Sally Pearson (Australia, Athletics): Olympic, World and Commonwealth champion over 100m hurdles - she set an Olympic record in the London 2012 final.
Ellyse Perry (Australia, Cricket/Football): Opening bowler for Australia's World Cup winning cricket squad, and a defender for the national football team.
Ronda Rousey (USA, Mixed Martial Arts): Another trailblazer - former Judo star who recently became the first female UFC Champion.
Wojdan Shaherkani (Saudi Arabia, Judo): The first Saudi woman to compete at the Olympic Games.
Sarah Storey (Great Britain, Swimming and Cycling): 11 Paralympic gold medals across 20 years and two sports. Staggering.
Katie Taylor (Ireland, Boxing): Irish Olympic sensation whose bouts generated the loudest crowd noise of London 2012.
Stafanie Taylor (West Indies, Cricket): 21-year-old West Indian star and current Women’s Cricketer of the Year.
Misty May Treanor and Kerry Walsh Jennings (USA, Beach volleyball): The only team on the list - these two won their third Olympic gold in London. Treanor (left) has now retired.
Yani Tseng (Taiwan, Golf): Despite a recent slump, the Taiwanese star is still the world's best female golfer.
Hayley Turner (UK, Horse racing): The country's most successful female jockey.
Marianne Vos (Netherlands, Cycling): Olympic road race champion. 2011 and 2012 winner of the Giro Donne, female cycling's only Grand Tour.
Abby Wambach (USA, Football): Star of the USA's Olympic gold winning team, reigning FIFA World Player of the Year.
Serena Williams (USA, Tennis): The greatest player of her generation back where she belongs at world number one.
Kim Yu-Na (South Korea, Figure skating): The 2010 Winter Olympic champion is a huge star in South Korea - she'll be even bigger if she wins in Sochi next year.