Qualified for her first World Aquatics Championships team by winning the women’s 800 freestyle at the 2023 Bell Canadian Swimming Trials.
At the 2022 Commonwealth Games, Zavaros finished 7th in the 800-m freestyle and 8th in the 200-m butterfly.
Mabel Zavaros finished sixth in the 200-m butterfly at the 2018 Pan Pacific Championships in Tokyo.
At the Gold Coast 2018 Commonwealth Games, Zavaros finished sixth in the 200-m butterfly and eighth in the 100-m butterfly. She set personal bests in both events.
At the 2018 Canadian Swimming Trials, Zavaros won gold in the 200-m butterfly, qualifying her for ther first senior national team.
At the 2017 FINA World Junior Championships in Indianapolis, Zavaros won two gold medals as she took part in the morning session in the women’s 4×200-m freestyle and the mixed 4×100-m medley. Zavaros also finished fourth in the 200-m butterfly, eighth in the 100 fly and 11th in the 50 fly.