[2] He won the men's doubles title at the National championships in 2009, 2011, and 2013 partnered with Ruud Bosch.

[3] Together with Bosch, they won some international tournaments in Portugal, Belgium, Canada, Slovenia, Norway, Peru and Tahiti.

[4] His parents, Rob and Marjan Ridder were also professional badminton players and current top veterans.

[5] Koen Ridder was elected vice-chair of the athlete commission of the BWF for a 4-year term in May 2015.

Koen retired as a professional player in 2014 after representing The Netherlands for more than 10 years at international badminton level.