At the 2009 Summer Universiade in Belgrade, Serbia, Muir captured the bronze medal in the women's 400 metres, finishing behind her teammate Esther Akinsulie by thirty-seven hundredths of a second (0.37), with a time of 52.07 seconds.
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Muir later emerged as a strong favorite to qualify for her second Olympics in London; however, she missed out of her contention with a third-place finish behind Jenna Martin, who attained a B-standard time of 51.55 seconds, at the Canadian Track and Field Championships in Calgary, Alberta.
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