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In their Classification 5-8 match, the United States entered the ninth period with a one point lead. Courtney Hurley fenced the final three minutes against Auriane Mallo to come away with a 32-28 victory.
South Korea dominated the Ukraine 45-34.
Kelley Hurley and Ana Maria Popescu kicked things off the in the first period with Popescu giving the Romanians a 3-1 lead.
Trailing for the majority of the match, Kelley Hurley got within one point of tying the bout in the eigth period.
Her sister Courtney would be the one to break the tie to start the ninth. Popescu netted a point to tie again but Hurley came right back to score three consecutive points to give the United States a 19-17 lead.
However, Popescu showed why the Romanian's are a favorite to win it all; she scored a point to tie the bout at 23 with the ninth period coming to a close, forcing sudden death overtime.
With just under 30 seconds left in overtime, Popescu scored the bout-winning touch to eliminate the United States from competition.
China took an early lead before Pantelyeyeva tied the bout at 16 in the fifth period. In the ninth, China held a 9 point advantage with 30 seconds to go; the #1 seed sent the Ukranians packing 42-34.
The countries dueled to a 7-7 tie at the start of the fourth period. Midway through the ninth, the score was again tied at 21.
South Korea's Injeong Choi tied the bout with 13 seconds left in regulation forcing overtime. Estonia ultimately came out on top with Irina Embrich scoring the game winning touch.
France took a 17-13 lead into the fifth period over the Russians. Frenchwomen Lauren Rembi was charged with the task of protecting a one point lead to begin the ninth against Violetta Kolobova.
With the fencers trading leads, Kolobova gained a point advantage for the Russian's with under 30 seconds.
Rembi's aggressiveness got her into trouble as Kolobova was able to take advantage and score on her attacks. Russia would ultimately advance 44-41.
Table of 16
Ukranian fencer Yana Shemyakina and Brazil's Amanda Simeao were the first fighters to step on to the piste for their respective countries. Shemyakina gave the Ukraine a quick 5-2 lead.
Brazil's Nathalie Moellhausen came out for the second period against Kseniya Pantelyeyeva. Moellhausen chipped away at the lead only allowing Pantelyeyeva to score twice.
Things began to turn around in the fourth period for the host country when Simeao returned to take on Pantelyeyeva. Simeao scored four points to get within a point of the Ukraine.
Pantelyeyeva created an eight point advantage in the seventh and the Ukraine never looked back winning the bout 45-32.