He won silver in the halfpipe at the 2013 FIS Snowboarding World Championships.

Later in 2014, he came in second behind American Taylor Gold in the Red Bull Double Pipe.

[3][4] At the 2015 Winter X Games held in Aspen, Colorado Hiraoka won the silver medal in the Superpipe in finishing second behind American snowboarder Danny Davis' Gold medal effort.

[5] On October 27, 2020, Hiraoka was found guilty and given a 30-month suspended prison sentence in a hit and run case that occurred the previous year and had injured 6 people.

Hiraoka had been driving under the influence of alcohol and fled the scene after the accident.