Canada got beat to a pulp by Ireland 50-7 in their Rugby World Cup opener at the Millennium Stadium in England.
The Six Nations champions scored seven tries in total, the first three coming in a 10-minute spell midway through the first half when Canada hardman Jamie Cudmore was in the sin-bin.
Canada didn't put up the sternest of tests; the only try was scored by Van Der Merwe, a DHL courier driver following an interception on halfway in the 68t.
The tactical Ireland was just too strong as their forwards did the basics which bode very well for them.
Jonathan Sexton ran the show from flyhalf, crossing once and kicking nine points to inspire Ireland to a 29-0 halftime lead. Sean O'Brien, Iain Henderson and Dave Kearney were the other first-half try-scorers.
Sean Cronin, Rob Kearney, and Jared Payne all dotted down in the final 16 minutes for Ireland.