In 2019, Mejías competed in the 57 kg event at the Pan American Games held in Lima, Peru without winning a medal; he was eliminated in his first match by Reineri Andreu of Cuba.

[1] In March 2020, Mejías won the silver medal in the 57 kg event at the 2020 Pan American Wrestling Championships held in Ottawa, Canada.

[4] Mejías won the silver medal in his event at the 2022 South American Games held in Asunción, Paraguay.

[5] He won the silver medal in his event at the 2024 Pan American Wrestling Championships held in Acapulco, Mexico.

[6] Mejías competed at the Pan American Wrestling Olympic Qualification Tournament held in Acapulco, Mexico hoping to qualify for the 2024 Summer Olympics in Paris, France.