[1] After graduation, he first joined Shimano Racing Team, for which he won the first stage of the Tour de Hokkaido in 2011.

[2] He moved to Bridgestone–Anchor in 2012[3] and won the men's time trial at the Japanese National Road Race Championships.

[4] For the 2013 season, he signed with UCI Professional Continental team Champion System.

[4] In December 2013, Nishizono announced his retirement as a professional cyclist.

[6] In 2016 he regained his national time trial title.