Answer
Tenshin Nasukawa was a professional kickboxing fighter before he transitioned to boxing. He made his professional kickboxing debut in 2012 and won his first 13 fights. He then went on to win the K-1 World Grand Prix in 2015 and the Rizin Fighting World Grand Prix in 2017. He retired from kickboxing in 2018 with a record of 43-1-1.