Faatumu le fuaiupu lenei: I le 2017, na avea ai Mastromatteo ma vaega o le au auro na manumalo i le 4x100 fefiloi fefiloi i le 2017 World Junior Swimming Championships. I le 2019, na manumalo ai Mastromatteo i pine e 3 i le
2019 Junior World Swimming Championships i Budapest, e aofia ai ma le pine siliva i le 50 mita breaststroke.