Mosaner played third for Italy at the 2018 European Curling Championships, where the country won its first medal at the event since 1979, picking up a bronze. He played third for Italy again at the 2019 World Men's Curling Championship, finishing in 7th place. Later that month, after winning the 2019 Italian Mixed Doubles Curling Championship he competed in the 2019 World Mixed Doubles Curling Championship for the first time, with partner Alice Cobelli. The pair finished the round robin with a 5-2 record, in third place in their group. The pair missed out on the playoffs as their draw shot challenge (DSC) record was not good enough compared to the other third place teams.