Hradilek won eight medals at the ICF Canoe Slalom World Championships with four golds (K1: 2013; K1 team: 2009, 2015; Extreme K1: 2017), three silvers (K1: 2010, K1 team: 2014, 2019) and a bronze (K1 team: 2007). He also won seven medals at the European Championships (4 golds, 2 silvers and 1 bronze).