Collins was the bronze medallist over 200 m at the 2001 World Championships in Athletics and became the 100 m champion at the 2002 Commonwealth Games. He won a silver medal over 60 metres at the 2003 IAAF World Indoor Championships, before going on to take his outdoor crown. He also won sprint medals at the 2005 World Championships, 2008 IAAF World Indoor Championships and 2011 World Championships. A dispute with the Saint Kitts and Nevis administrators saw Collins dropped from the 2012 Olympic Games and he did not return to international duty until 2015.