Kopacz started his sporting career as a varsity level shot putter at University of Western Ontario in London, Ontario. With encouragement from his university coaches he attended a Canadian talent ID camp for bobsleigh athletes in April 2013. Kopacz would start racing later that year with Nick Poloniato on the North American race circuit. The next year he competed with Chris Spring in the 2014–15 Bobsleigh World Cup, his first year in the top level circuit. At the 2015 World Championships Kopacz battled through pneumonia to help push Spring to eighth place in the four-man bobsled. He stepped on the podium for the first time at the World Cup event in Lake Placid, New York, as part of Justin Kripps' four-man team.