Claressa Shields: U.S. Olympic champ

The United States' Claressa Shields, leaves the arena after winning her fight against Russia's Nadezda Torlopova, during the women's middleweight 75-kg boxing gold medal match at the 2012 Summer Olympics, Thursday, Aug. 9, 2012, in London.

Gold medallist Claressa Shields of the USA listens to the American national anthem on the podium during the awards ceremony for the women's boxing Middleweight category of the 2012 London Olympic Games at the ExCel Arena August 9, 2012 in London.

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.

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.

Left to right: Silver medalist Nadezda Torlopova of Russia, gold medalist Claressa Shields of the United States, bronze medalist Marina Volnova of Kazakhstan and bronze medalist Jinzi Li of China celebrate on the podium during the medal ceremony for the Women's Middle (75kg) Boxing final bout on Day 13 of the London 2012 Olympic Games at ExCeL on August 9, 2012 in London, England.

Claressa Shields of the USA (R) celebrates defeating Nadezda Torlopova of Russia to win gold during the women's boxing Middleweight of the 2012 London Olympic Games at the ExCel Arena August 9, 2012 in London.

Claressa Shields of the United States celebrates her victory against Marina Volnova of Kazakhstan during the Women's Middle (75kg) Boxing semifinals on Day 12 of the London 2012 Olympic Games at ExCeL on August 8, 2012 in London, England.

In this Saturday, Feb. 18, 2012 file photo, Claressa Shields, left, and Tika Hemingway battle during a middleweight boxing match at the U.S. Olympic women's boxing team trials in Spokane, Wash. Shields is one of a crowd of female athletes grabbing the limelight at the 2012 London Olympics Games, which are quickly shaping up as a watershed for women's sports.

Claressa Shields of the USA holds her Gold medal during the awards ceremony for the women's boxing Middleweight category 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.