He reached the final of the 2018 BDO World Trophy but lost to Glen Durrant, 10–7 in legs.
Unterbuchner also participated in the German Super League where he made the semi-finals before losing 9–3 to Dragutin Horvat.
Unterbuchner won a Tour Card for the first time at the PDC Q-School in February 2021.
After losing his card he returned to competing in World Darts Federation events, reaching the last 64 at the 2023 Dutch Open.
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