Cheryl started playing badminton at a young age, brought to the sports hall by her parents, who were both former badminton players and now coaches in the Dutch city of Roermond. When she was 13 years old she moved away from her home to the Western part of the Netherlands to play badminton in Amstelveen for van Zijderveld. At age 15 she was called upon to join the Dutch National juniors squad in Papendal. After two and a half years she was removed from the National team, but fought her way back to the top and back into the National squad. [7]
Seinen has won the women's doubles events in Romania, Scotland, Slovakia, Switzerland, Belgium, Ireland and the Netherlands, and has also won mixed doubles events in Scandinavia. She won her home event, the Dutch Open twice with Debora Jille in 2022 and 2023 after finishing runners-up two times in 2018 (with Selena Piek) and 2021 (with Debora Jille). Together with Selena Piek she reached the semi-finals at the Thailand Masters (BWF World Tour Super 300) in 2019 and also the semi-finals at the All England in 2021 (BWF World Tour Super 1000). She competed at the 2020 Summer Olympics winning two matches and losing one match in group B, losing the quarter final match against the Korean opponents of Lee So-hee and Shin Seung-chan 8-21, 17-21.[8]
She has won the women's doubles title a total of six times at the Dutch National Badminton Championships from 2017 till 2020 with Selena Piek and in 2022 and 2023 together with current partner Debora Jille; and she has also won the mixed doubles title twice in 2017 and 2028 with Robin Tabeling. In the Dutch Eredivisie league, she is playing for BV Almere, while in Denmark in the Elite league her club is Vendsyssel Badminton Club.
The BWF World Tour, which was announced on 19 March 2017 and implemented in 2018,[9] is a series of elite badminton tournaments sanctioned by the Badminton World Federation (BWF). The BWF World Tour is divided into levels of World Tour Finals, Super 1000, Super 750, Super 500, Super 300, and the BWF Tour Super 100.[10]
^"Seinen Cheryl" (in Dutch). Tokyo Organising Committee of the Olympic and Paralympic Games. Archived from the original on 6 October 2021. Retrieved 21 October 2021.
^Sukumar, Dev (10 January 2018). "Action-Packed Season Ahead!". Badminton World Federation. Archived from the original on 13 January 2018. Retrieved 15 January 2018.