[3] Merenzon competed as a junior at the 2014 Pacific Rim Championships and won a silver medal in the group all-around.

[4] She also competed at the 2014 Junior Pan American Championships and won gold in the five hoops and 10 clubs, and bronze in the group all-around.

[5][6] Merenzon competed with the senior U.S. team at the 2017 World Championships in Pesaro and finished twelfth in the group all-around.

[8] Merenzon competed at the 2019 Pan American Games and won the silver medal in the group all-around and in the 5 balls.

[10][11] At the 2021 Pan American Championships in Rio de Janeiro, Merenzon and the U.S. team won the bronze medals in the all-around, and in both the 5 balls and the 3 hoops + 4 clubs.