On April 26, 2018, Flicker took part in the European Championships in Tel Aviv and won a bronze medal in the under 66 kg weight category. In the first round he defeated Nathon Burns of Great Britain by waza-ari, in the second round he defeated Vadim Bunescu of Moldova by ippon. In the quarter finals he lost to Adrian Gomboc of Slovenia. He went on to defeat João Crisóstomo of Portugal in the repechage and reached the bronze medal match where he defeated Marko Gusic of Montenegro by ippon.