Simone Biles (USA, Gymnastics) | Keep an eye out for the unstoppable gymnist Simone Biles. In 2013 and 2014, Biles won the U.S. national title followed by the world all-around title.
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Ellen Hoog (Netherlands, Field Hockey) | The star of the Dutch women's field hockey team, Ellen Hoog, is looking to win gold in Rio, which would be the third in a row for her field hockey team.
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Allyson Felix (USA, Track and Field) | Track and field star Allyson Felix could make more history in Rio. She is the world's best in the 200m. According to NBC, She is tied with Jackie Joyner-Kersee for the most Olympic track and field medals earned by a U.S. woman and three behind the most won by any woman in the sport.
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Katie Ledecky (USA, Swimming) | 18-year-old Olympic swimmer Katie Ledecky is the world record holder in the 400, 800, and 1,500 meter freestyle. NBC calls her one of the "most dominant" athletes of the olympic games. She is approaching the world's best status in the 200-meter freestyle.
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Gwen Jorgensen (USA, Triathlon) | Wisconsin native Gwen Jorgensen hs been unbeaten for more than a year. She has won 12 straight triathlons.
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Claressa Shields (USA, Boxing) | In 2012, at the age of 17, Claressa Shields became the first American women to win a gold medal in boxing at the London Olympics. She has been undefeated since.
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Si Yajie (China, Diving) | Si Yajie, who has been diving since she was 6 years old, won the 10-meter platform titale the 2013 world championships at just 14 years old. According to Rio 2016, she is a major contender at her first Olympic Games in Rio.
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Yana Kudryavtseva (Russia, Rhythmic Gymnastics) | Yana Kudryavtseva will make her Olympic debut at the Rio 2016 Summer Olympics. According to Rio 2016, won three gold medals at the 2013 world championships, where she became the youngest ever all-round world champion, at the age of 15.
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Emma Jorgensen (Denmark, Canoe Sprint) | According to Rio 2016, Emma Jorgensen won two gold medals at the 2014 junior world championships and won gold at the senior world championships in the same year.
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Ami Kondo (Japan, Judo) | 19-year-old Ami Kondo won the 2014 world championships, and two months later won the junior world championships.
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