[6] Sedláček qualified for the 2014 BDO World Darts Championship playing Paul Hogan in the preliminary round, losing 3–1.

He qualified for the 2015 BDO World Darts Championship, playing Paul Coughlin in the preliminary round; he won 3–2.

[8] Following a 3–0 defeat to Keegan Brown at the World Championship, he went on to qualify for the 2019 German Darts Grand Prix in Munich.

Wins over Diogo Portela, Ian White and Darren Webster saw Sedláček reach the quarter-finals, where he went down 6–5 to Max Hopp.

Sedláček was also able to qualify for his home tournament, the 2019 Czech Darts Open, where he was eventually beaten in the second round 6–4 by Ian White.

Due to the results of Robert Owen, Nick Kenny and Jeffrey de Graaf at the World Championship, he dropped to 66th place on the rankings and lost his Tour Card,[14] but he regained it at 2025 Q-School.