On August 29, 2017, Flicker won a bronze medal at the 2017 World Judo Championships in Men's 66 kg in Budapest, Hungary. Flicker reached the semi-final where he lost to Mikhail Pulyaev of Russia, and then in the bronze medal contest he beat European champion Georgii Zantaraia of Ukraine by a waza-ari. He followed in the footsteps of fellow Israeli Golan Pollack, who won a World Championships bronze medal in the U66 category as well, two years prior. He became the fourth Israeli man in history to win the bronze, the others being Oren Smadja, his trainer, and Arik Zeevi, who won in the open-weight category. In August 2017 he was ranked # 1 in the world in the U66 kg division.