The youngest women's boxer at the London Olympics has guaranteed she'll return home with some hardware.

Claressa Shields, a 17-year-old middleweight from Flint, Mich., beat Sweden's Anna Laurell 18-14 in the quarterfinals on Monday after receiving a first-round bye. Shields clinched at least a bronze medal -- two bronze medals are awarded to the semifinal losers -- but still has a shot at silver or gold.

Shields, who will be a senior at Northwestern (Flint, Mich.), takes on Marina Volnova of Kazakhstan on Wednesday in the semifinals.

Volnova defeated Great Britain's Savannah Marshall in the quarterfinals. Marshall handed Shields her only loss as an amateur in May at the Women's World Boxing Championships in Qinhuangdao, China.

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