Marciniak in 2013
|Full name||Szymon Marciniak|
7 January 1981|
On 30 June 2015 he was the head referee at the 2015 UEFA European Under-21 Championship Final.
He participated in the 2016 UEFA European Championships and refereed three matches: Spain-Czech Republic and Iceland-Austria in the group stage of the tournament as well as Germany-Slovakia in the knockout phase.
On 29 March 2018, FIFA announced that he would officiate some matches at 2018 FIFA World Cup along with Pawel Sokolnicki and Tomasz Listkiewicz as assistant referees. He officiated two group stage matches: Argentina-Iceland and Germany-Sweden.
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