Claressa Shields: U.S. Olympic champ

Claressa Shields of the USA (in red) defends against Nadezda Torlopova of Russia (in blue) during the women's boxing Middleweight final of the 2012 London Olympic Games at the ExCel Arena August 9, 2012 in London. American teenager Claressa Shields won the first ever women's Olympic middleweight final with a 19-12 win over Russia's Nadezda Torlopova. At 17 years and 145 days, Shields is the youngest boxer to win an Olympic gold medal since compatriot John Fields won the featherweight title at the 1924 Games in Paris as a 16-year-old.

Credit: JACK GUEZ/AFP/GettyImages