In 2012 he became Paralympic champion in the +100 kg by beating Song Wang (China) in the final.

The 2016 Summer Paralympics in Rio was Masaki's second appearance at the Games.

Competing in the +100 kg category, he secured his second Paralympic medal with a bronze However, he faced a setback in the semi-final when he had his first-ever defeat in a Paralympic match to Adiljan Tuledibaev of Uzbekistan.

Tuledibaev went on to win the gold medal, while Masaki ultimately won the bronze-medal match.

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