[4] He first competed in the U23 category in 2004, achieving fifth place at the European U23 Championships in C1 team with Alexander Slafkovský and Ján Bátik.

[10] Two years later, he finished fifth in individual and seventh in the team event[11] and in 2007 he won his first medal in this category, bronze in C1 in Krakow.

In 2010 he won his first individual senior medal: silver at the European Championships, when the Slovak canoeists swept all the podium positions.

At the European Senior Championships he first competed in the team event in 2007 with Martikán and Juraj Minčík, immediately winning the gold medal.

Over the next five years they won 4 European titles together, with the exception of the 2014 season when Beňuš didn't make the national team selection.

[17] His older sister Dana Mann is also a gold medalist from the 2011 ICF Canoe Slalom World Championships in K1 team category, together with Elena Kaliská and Jana Dukátová.

His mother Jana Kubovčáková won a bronze medal in the K1 team event at the 1975 ICF Canoe Slalom World Championships.

[18] Beňuš is a practicing Roman Catholic who was raised and shaped at Salesian Youth Center in Trnávka neighbourhood of Ružinov, Bratislava.