Visentin's first experience with Hockey Canada resulted in a gold medal with Team Ontario at the 2009 World Under-17 Hockey Challenge. During the summer of 2010, Visentin spent time in the summer at Team Canada's summer development camp, as well as Hockey Canada's goaltender camp. Visentin was named to Canada's roster for the 2011 World Junior Championships. Olivier Roy was Canada's starting goaltender for most of the tournament, but Visentin replaced him after Canada's loss to Sweden. Visentin started in Canada's wins against Switzerland in the quarterfinals, and against the United States in the semi-finals, for which he was named Canada's Player of the Game. These performances secured his spot as Canada's starting goaltender in the gold medal game against Russia. But in the final, Visentin conceded five goals in the third period as Russia came from behind to win 5–3. After the game, Visentin struggled to explain what had happened: "There's really no words to describe it."