Rousseau has been part of two historic sweeps of the medal podiums on the 2008-09 FIS Freestyle Ski World Cup tour with Alexandre Bilodeau and Vincent Marquis. Pierre-Alexandre Rousseau was the world champion at the 2007 Freestyle Ski World Championships in the moguls event. Rousseau also achieved at silver in the moguls event of the 2001 World Championships at Blackcomb.