The St. Theresa's 8th and 6th grade Parish girls’ teams won the 2019 New England CYO Championship. The 8th graders defeated St. Adelaide (Boston, MA) in the semifinals, 47-36, and knocked off host team St. Elizabeth-Seton (Manchester, NH) in the finals 39-28. They also won the Bridgeport Diocesan Championship in 2017 and won the Fairfield County Championship in 2016-17. The In-Sports Holiday Tournament champions in 2017-18, Theresa's has amassed over 130 wins in four years.

In the semifinals, the 6th grade girls defeated a previously undefeated St. Adelaide team from Boston 25-12. In the championship, they beat a strong St. Pius V team from Providence (R.I), 19-18 at the buzzer on a game-winning shot by Ava Mullen. In the past three seasons, St. Theresa's has captured numerous championships including the FCBL A division championship, multiple Milford post-season Hoopfest Tournaments, a Milford pre-season tournament and the Insports Holiday Tournament.