On the ITF Junior Circuit, Mateas had a career-high combined ranking of 26 in April 2016.

[2] Mateas made her WTA Tour main-draw debut at the 2016 Bank of the West Classic, having received a wildcard into the singles tournament.

[citation needed] She made her major debut at the 2023 US Open in mixed doubles, partnering Mackenzie McDonald.

348, Mateas made her singles debut at the WTA 1000 level, after qualifying into the main draw of the 2023 Guadalajara Open, losing in the first round to Emma Navarro.

[3] She won the 2024 Championnats Banque Nationale de Granby, defeating Kayla Cross in the final.