The result was cruel for the Canadians who lost a similarly tight duel with the same opponents 19-14 in the 2003 World Cup. They dominated for long periods and scored the try of the tournament so far through DTH van der Merwe.
Italy's win after a heavy defeat to France in their opener gives them a boost eight days from an intimidating encounter with Six Nations champions Ireland.
Canada's sole consolation was a defensive bonus point.