Niels has tallied quite a few cups, bowls and medals in his career. In addition to the Grand Slam titles listed below, Niels became World Junior Champion in 2019. He won bronze (single) and gold (doubles) at the Tokyo 2021 Paralympic Games. By winning at the European Para Championships 2023, he is guaranteed participation in the Paralympic Games in Paris 2024. In addition, he is the 2022 and 2023 world champion in the quad category.
4
Grand slam single titles
7
Grand slam double titles
40
ITF single titles
1
ITF Quad single ranking
Australian Open
2023 single Runner-up
2023 double Winner
2022 single Quarterfinalist
2022 double Runner-up
2021 single Semi-finalist
2021 double Semi-finalist
Roland Garros
2023 single Winner
2023 double Semi-finalist
2022 single Winner
2022 double Winner
Wimbledon
2023 single Winner
2023 double Winner
2022 single Runner-up
2022 double Winner
US Open
2023 single Runner-up
2023 double Winner
2022 single Winner
2022 double Winner
2021 single Runner-up
2021 double Winner