Ratajski represented Poland in the inaugural PDC World Cup of darts in partnership with Krzysztof Kciuk. They lost 2–6 in the first round to New Zealand, who were represented by Phillip Hazel and Warren Parry. He did not feature in the tournament again until 2013, once more with Kciuk, and they progressed to the last 16 by finishing second in Group E thanks to beating Gibraltar 5–2. They played the host nation Germany, who were represented by Jyhan Artut and Andree Welge, and were defeated 5–2.