Born in Saitama Prefecture on 17 May 2000, Hiroki Midorikawa began playing badminton at the age of seven, influenced by his parents and older sister.

Midorikawa resides in Sayama City and attended Sanno Elementary, followed by Saitama Sakae Junior and Senior High School.

When a shoulder injury prevented him from smashing, instead of being discouraged, he proactively used the opportunity to improve the precision of his drop shots and clears, as well as his footwork.

Midorikawa also views his small stature as an advantage, believing that his high energy and greater mobility allow him to overcome any perceived limitations typically associated with being a shorter badminton player.

Midorikawa's first year on the A team was marked by winning his first Super 500 title at the Canada Open against Denmark's Mathias Thyrri and Amalie Magelund.