Jones Ralfy Jansen
Jones Ralfy Jansen is an Indonesian badminton player and now represents Germany. He was a former PB Djarum players and has joined that club in 2007. In 2010, he awarded as the best Djarum player. He won his first senior international title at the 2013 Portugal International tournament in the mixed doubles event partnered with Keshya Nurvita Hanadia. He also won the 2014 Finnish and Turkey International tournaments with his sister Cisita Joity Jansen.
Personal life
His father Joy Jansen is German, while his mother Meity Rumayar is Indonesian. He was born and raised in Indonesia with his elder sister Cisita Joity Jansen who is also a badminton player.Achievements
Asian Junior Championships
Boys' doubles| Year | Venue | Partner | Opponent | Score | Result |
| 2010 | Stadium Juara, Kuala Lumpur, Malaysia |  Dandi Prabudita |  Yew Hong Kheng Ow Yao Han | 10–21, 7–21 | Bronze |
BWF Grand Prix (1 runner-up)
The BWF Grand Prix has two levels, the BWF Grand Prix and Grand Prix Gold. It is a series of badminton tournaments sanctioned by the Badminton World Federation since 2007.Men's doubles
| Year | Tournament | Partner | Opponent | Score | Result |
| 2016 | Brasil Open |  Josche Zurwonne | Michael Fuchs Fabian Holzer | 19–21, 18–21 | Runner-up |
BWF International Challenge/Series (9 titles, 5 runners-up)
Men's doubles| Year | Tournament | Partner | Opponent | Score | Result |
| 2019 | Irish Open | Peter Käsbauer |  Alexander Dunn Adam Hall | 21–19, 17–21, 21–18 | Winner |
| 2019 | Lagos International | Peter Käsbauer |  Arjun M.R. Ramchandran Shlok | 21–11, 21–8 | Winner |
| 2019 | Finnish Open | Peter Käsbauer | Muhammad Shohibul Fikri Bagas Maulana | 17–21, 17–21 | Runner-up |
| 2016 | Italian International | Josche Zurwonne |  Richard Eidestedt Nico Ruponen | 21–17, 21–18 | Winner |
| 2016 | Irish Open | Josche Zurwonne |  Liao Min-chun Su Cheng-heng | 27–25, 23–21 | Winner |
| 2016 | White Nights | Josche Zurwonne |  Bastian Kersaudy Julien Maio | 21–15, 21–14 | Winner |
| 2016 | Estonian International | Josche Zurwonne | Martin Campbell Patrick Machugh | 21–15, 21–18 | Winner |
| 2014 | Polish International | Daniel Benz |  Adam Cwalina Przemyslaw Wacha | 8–11, 11–6, 5–11, 11–8, 9–11 | Runner-up |
| 2012 | Slovenia International | Andreas Heinz |  Zvonimir Durkinjak Zvonimir Hoelbling | 21–17, 17–21, 12–21 | Runner-up |
Mixed doubles
| Year | Tournament | Partner | Opponent | Score | Result |
| 2015 | Romanian International | Cisita Joity Jansen | Tarun Kona N. Siki Reddy | 7–11, 8–11, 4–11 | Runner-up |
| 2014 | Turkey International | Cisita Joity Jansen | Markus Fernaldi Gideon  Gabriela Stoeva | 17–21, 21–17, 21–12 | Winner |
| 2014 | Finnish International | Cisita Joity Jansen |  Alexandr Zinchenko Olga Morozova | 15–21, 21–17, 21–16 | Winner |
| 2013 | Slovenia International | Cisita Joity Jansen | Zvonimir Durkinjak Stasa Poznanovic | 12–21, 18–21 | Runner-up |
| 2013 | Portugal International | Keshya Nurvita Hanadia |  Anders Skaarup Rasmussen Lena Grebak | 21–16, 18–21, 21–16 | Winner |