[3] He has the distinction of being the first male singles titlist to achieve five consecutive national championships: 2007 to 2011.

[5] At the 2020 Summer Olympics, Mizutani and Mima Ito won gold in the inaugural mixed doubles event.

[7] At the 2020 Summer Olympics in Tokyo, Mizutani and Mima Ito defeated Liu Shiwen and Xu Xin in the mixed doubles finals to become the first non-Chinese to win gold at an Olympic table tennis event since 2004.

[8][9] Mizutani retired after the 2020 Summer Olympics which was confirmed by World Table Tennis on 10 February 2022.

His increasing sight difficulties had forced him to wear special glasses during matches and he cited that it contributed to him retiring.