 Merrill began his senior career with the Coquitlam Adanacs of the Western Lacrosse Association, and later the Brampton Excelsiors of Major Series Lacrosse, winning two consecutive Mann Cup championships (2008–2009).Merrill is currently playing for the Kahnawake Mohawks in the Quebec Senior Lacrosse League.In 2006, he helped the Canadian national lacrosse team to an historic win at the World Lacrosse Championship in London, Ontario.