• Mastrosimone was named to the USHL Third All-Star Team in 2018-19 after ranking tied for fourth in the league in goals and tied for 11th in points with 31-29—60 in 54 games with the Chicago Steel.

• In his first year in the USHL, Mastrosimone was named to the All-Rookie Team in 2017-18 after ranking third among first-year skaters with 16-29—45 in 60 games.

• Was a member of Team USA’s gold medal-winning entry at the 2018 World Junior A Hockey Challenge where he tallied 2-2—4 in six games. He also represented his country at the 2018 Hlinka Gretzky Cup where he tied for third on his team with 3-2—5 in five games.

• Mastrosimone, who has committed to Boston University for the 2019-20 season, models his style of play after Bruins forward Patrice Bergeron.