Mendez competed at the International Racquetball Federation (IRF) Junior World Championships in 2007 in Cochabamba, Bolivia, where she won Girl’s U10, beating Mexican Karla Gascon, 15-4, 15-1, in the final.

[2] However, in 2009, Mendez played Girls U14 Doubles with Masiel Rivera, and they were runners-up to the USA’s Kelani Bailey and Abbey Lavely, losing the final, 15-7, 15-10.

[5] Mendez reached the Girls U14 Singles final at the 2011 World Juniors in Santo Domingo, Dominican Republic, where she lost to Diana Aguilar of Mexico, 11-15, 15-10, 11-5, once again.

[8] But Mendez found success in the Girls U16 Singles that year, as she won that division by defeating Ximenez Gonzalez of Mexico in the final, 15-11, 15-12.

[11] Mendez played at the Pan American Championships for the first time in 2014 in Santa Cruz, Bolivia, representing her native land at home.

But in Women’s Doubles with Adriana Riveros, they beat Soley and Melania Sauma (Costa Rica), 15-10, 15-7, in the Round of 16, but lost to two time defending champions Paola Longoria and Samantha Salas of Mexico, 15-5, 15-12, in the quarterfinals.

At the 2014 World Junior Championships in Cali, Colombia, Mendez lost in the quarterfinals of Girls U16 Singles to team-mate Hawira Rojas, 9-15, 15-7, 11-8.

[15] She played doubles with Wanda Carvajal that year, and they lost in the semi-finals to Costa Ricans Melania Sauma and Sofia Soley, 15-8, 7-15, 11-3.

In doubles, Mendez and Carola Loma defeated Gabriela Martinez and Maria Renee Rodriguez of Guatemala in the Round of 16, 10-15, 15-11, 11-5, but then lost to Mexicans Paola Longoria and Samantha Salas, 15-9, 15-0, in the quarterfinals.

[21] In Women's Doubles, Mendez partnered with Maria Jose Vargas, and they lost to Mexicans Paola Longoria and Alexandra Herrera, 15-14, 15-6., in the quarterfinals.

At the 2018 World Championships in San José, Costa Rica, Mendez played both singles and doubles, as she represented Argentina for the first time.

At the 2019 Pan American Championships in Barranquilla, Colombia, Mendez reached the semi-finals in Women’s Singles, as she beat Mexico’s Montserrat Mejia in the quarterfinals, 15-13, 15-13.

In Women’s Doubles, Mendez and Vargas beat Chileans Carla Muñoz and Josefa Parada, 15-7, 15-8, in the Round of 16, but they lost in the quarterfinals to Longoria and Samantha Salas of Mexico, 15-7, 15-6.

She won gold in Women's Doubles with Maria Jose Vargas, defeating Mexicans Alexandra Herrera and Samantha Salas in the final, 15-14, 14-15, 15-10, 8-15, 11-9.

[26] In the Women's Doubles final, she and Valeria Centellas lost to Mexicans Paola Longoria and Samantha Salas in five games, 11-6, 15-17, 11-9, 9-11, 12-10, resulting in a silver medal.

[32] Mendez and Maria Jose Vargas played Women's Doubles, and they defeated Americans Michelle Key and Erika Manilla in the quarterfinals, 10-12, 11-9, 11-5, 12-10, and Mexicans Alexandra Herrera and Montserrat Mejia in the semi-finals, 5-11, 11-13, 3-11, 11-7, 11-7.

In Women's Doubles they defeated Canadians Frédérique Lambert and Juliette Parent in the semi-finals, 11-6, 11-4, 11-2, but lost in the final to Mexicans Alexandra Herrera and Montserrat Mejia, 11-3, 9-11, 15-13, 7-11, 11-7.