[26][27][28][29] On 1 June 2013, Flicker won his first international contest as a senior after defeating Ivan Spirin from Russia in the final of the European Open Bucharest.

[6][7][8] 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.

[48] 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.

[3] On 26 October, Flicker won a gold medal at 2017 Abu Dhabi Grand Slam in the United Arab Emirates[22][23][24] after defeating world championships bronze medalist Nijat Shikhalizada of Azerbaijan with an ippon.

[50][54][55] In addition, instead of having "ISR" by his names on the scoreboard and on his back to denote that he was competing for Israel, at the insistence of the organizers "IJF" (for the International Judo Federation) was substituted.