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Marchessault was named the QMJHL Top Star of the Week for the week ending September 19, 2010. He was also named CHL Player of the Week for the week ending April 3, 2011, during the QMJHL playoffs. At the end of the season, Marchessault was awarded the Bud Light Cup as Quebec's player of the year. Moreover, he was named a QMJHL First Team All-Star.