He has been a runner-up of the All England three times (2013, 2014 and 2016) along with his partner, Hiroyuki Endo.

[2] Hayakawa won the first point in the 2014 Thomas Cup finals with Hiroyuki Endo beating 2004 World Junior Champions Hoon Thien How and Tan Boon Heong and lead the momentum for the Japanese team to claim the Thomas Cup for the first time, being the fourth nation to win Thomas cup after Indonesia, China and Malaysia.

[1] He was appointed as the Japan national badminton team coach in 2017.

A season of Superseries consisted of twelve tournaments around the world that had been introduced since 2011.

[6] Successful players were invited to the Superseries Finals, which were held at the end of each year.