He won an Olympic gold medal in 2016 in Rio de Janeiro in the C2 event. He also won ten medals at the ICF Canoe Slalom World Championships with a gold (C2 team: 2009), five silvers (C2: 2009, 2017; C2 team: 2011, 2013, 2014) and four bronzes (C2: 2011, 2013, 2014; C2 team: 2007). He won the overall World Cup title in the C2 category in 2009, 2010 and 2014. At the European Championships Škantár won a total of 13 medals (7 golds, 1 silver and 5 bronzes).