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Marcellus Andrellious "Mardy" Scales (born September 10, 1981) is an American sprinter who specializes in the 100 metres. He won a silver medal at the 2003 Pan American Games. He also competed in the 4×100 metres relay at the 2005 World Championships, but after a failed exchange the US team was disqualified. His personal best time over 100 metres is 10.07 seconds, achieved in June 2004 in Austin. His personal best time over 60 metres is 6.59 seconds, achieved in February 2005 in Fayetteville. In the 200 metres, he has 20.62 seconds, achieved in August 2005 in Malmö.