Francine Niyonsaba
Francine Niyonsaba is a Burundian track and field athlete, specializing in the 800 metres. She is the National record holder in the event, improving her own record to 158.67 on August 9, 2012 in the semifinal round of the Womens 800m event at the 2012 Summer Olympics. It was a .01 improvement on her previous record. Two days later she finished seventh in the Olympic final. Less than a month later she took the record down yet again to 156.59.
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Source: Wikipedia