#3 Serena Williams - 19 years, 1 day
One of the best tennis players of all-time, Serena Williams was a few weeks shy of 18 when she won her first Grand Slam at the US Open, beating Martina Hingis in the final in straight sets. During the Sydney Olympics, Serena did not play the Singles tournament but teamed up with her sister Venus for the women’s doubles tournament.
The unseeded duo had a comfortable outing in the first round before beating the Russian pair of Elena Likhovtseva and Anastasia Myskina in a three-setter to set up a quarter-final clash against the top-seeded French pair of Amelie Mauresmo and Julie Halard-Decugis. They beat them in straight sets before beating the 5th seeded Belgian pair of Els Callens and Dominique van Roost in the semis, also in straight sets.
In the gold medal match, the Williams sisters were up against the Dutch pair of Kristie Boogert and Miriam Oremans who they comprehensively beat 6-1, 6-1 just one day after Serena had celebrated her nineteenth birthday. The Williams sisters went on to win another two gold medals at the 2008 Beijing Olympics and at the 2012 London Olympics.
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