[1] He won the silver medal in the men's kumite +84 kg event at the 2019 Pan American Games held in Lima, Peru.

[1] He represented Canada at the 2020 Summer Olympics in Tokyo, Japan.

[2] Gaysinsky won the gold medal in the men's kumite +84 kg event at the 2017 Pan American Karate Championships held in Curaçao.

[3] A year later, he won one of the bronze medals in his event at the 2018 Pan American Karate Championships held in Santiago, Chile.

[4] In 2019, Gaysinsky won the silver medal in the men's kumite +84 kg event at the Pan American Games held in Lima, Peru.