von dellingshausen turned professional in late 2016 and played on the 2017 pro golf tour. in february he lost in a four-way playoff in the tony jacklin open, before winning the tazegzout open in march. he had further wins in the adamstal open and the sierra polish open, as well as two more runner-up finishes. his third win earned him immediate promotion to the challenge tour. in his third challenge tour event, he was runner-up in the 2017 bridgestone challenge, where oscar lengdén took victory with a birdie-birdie-eagle finish. he won the 2017 pro golf tour order of merit.