Toth won the gold medal in the 50 km walk at the 2010 IAAF World Race Walking Cup, and at the 2015 World Championships, taking Slovakia's first ever gold at the championships.

[1] He finished first at the 2016 Olympic Games in 50 km walk, winning the first Slovak Olympic medal in athletics and also being the first Slovak gold medalist in a Summer sport other than canoe slalom.

[2] In 2018, he won silver medal in the men's 50 kilometres walk at the 2018 European Athletics Championships held in Berlin, Germany.

[3] In 2019, he competed in the men's 50 kilometres walk at the 2019 World Athletics Championships held in Doha, Qatar.

[4] Toth represented Slovakia at the 2020 Summer Olympics and finished 14th in the men's 50 kilometres walk with a season best.