Tanner is the long-time lead for de Cruz. The team played in two World Junior Curling Championships, winning gold at the 2010 World Junior Curling Championships (defeating Scotland's Ally Fraser in the final) and a silver at the 2011 World Junior Curling Championships (losing to Sweden's Oskar Eriksson in the final). 2011 was the final year of junior eligibility for de Cruz. Even though Tanner could have played another two years of juniors, he stuck with de Cruz to play in men's events.