Ronny and his brother Kim Huybrechts became the first brothers to play in the World Cup of Darts in February 2013 and advanced from Group H courtesy of a 5–0 win over Hungary. They then pulled off a shock by defeating the Australian pairing of Simon Whitlock and Paul Nicholson, who were the runners up in the event last year, 5–1 with a combined average of 101.08 and then beat Croatia in the quarter-finals, with Ronny defeating Robert Marijanović 4–1 in his singles match. They required a doubles match to see off Finland in the semi-finals which they won 4–0 with a 105.47 average, the highest in the three-year history of the event, to reach the final and a meeting with the English pair of Phil Taylor and Adrian Lewis. Ronny lost both of his singles matches (0–4 to Taylor and 2–4 to Lewis) meaning Kim had to beat Taylor to force a doubles match to decide the title, but he lost 1–4. The brothers dedicated their run in the tournament to their late father, Ludo, who died in December 2012.