In May 2011, Mattenet was the first Frenchman to qualify for the London 2012 Olympic Games by beating Singapore's Gao Ning to reach the Quarterfinals of the 2011 World Championships. At the 2012 Olympics, he lost to Chen Weixing in the fourth round. In June 2015, he competed in the inaugural European Games, for France in table tennis, more specifically, Men's team with Simon Gauzy and Emmanuel Lebesson. He earned a silver medal.