Marcoux comes from a skating family. Her mother and sister were figure skaters and her father played hockey. Buntin began skating at age 10 in order to improve his skating skills for hockey. Marcoux/Buntin teamed up in 2002 and won the first international competition they entered, the 2002 Nebelhorn Trophy. The couple changed coaches in spring 2003 and moved to Richard Gauthier's group in Montreal. They almost quit skating following this move due to financial problems and due to difficulties adapting to their new coaching situation. But they overcame these problems to win the 2004 National title.