Ratajski qualified for the 2017 BDO World Darts Championship. He earned his first two wins at the event, including a 3–0 victory over Wesley Harms, before narrowly losing to Darius Labanauskas in the last 16. At the 2017 World Cup, Ratajski and Tytus Kanik lost 5–3 in the first round to the Irish team of Mick McGowan and William O'Connor.