Biles is a four-time World all-around champion (2013–15, 2018), four-time World floor exercise champion (2013–15, 2018), two-time World balance beam champion (2014, 2015), the 2018 World vault champion, a six-time United States national all-around champion (2013–16, 2018, 2019), and a member of the gold-medal-winning American teams at the 2014, 2015, and 2018 World Artistic Gymnastics Championships. Additionally, she is a three-time World silver medalist (2013 and 2014 on vault, 2018 on uneven bars) and a three-time World bronze medalist (2015 on vault, 2013 and 2018 on balance beam). Having won a combined total of twenty-five Olympic and World Championship medals, Biles is the most decorated American gymnast. Biles became the sixth woman to win an individual all-around title at both the World Championships and the Olympic Games. Biles set an American record for most gold medals in women's gymnastics at a single Olympic Games (four). At the 2018 World Artistic Gymnastics Championships in Doha, Biles became the female gymnast with the most World all-around titles (4) and total World medals (20), as well as the gymnast with the most World gold medals of any gender (14). She also became the tenth gymnast and first American gymnast to win a World medal on every event. Many observers consider her to be the greatest gymnast of all time.