In May, Brown won the World Youth Championship 6–4 against Rowby-John Rodriguez at the O2 Arena in London as part of the Premier League finals night. The title secured Brown's place in the 2014 Grand Slam of Darts and 2015 World Championship. At the Grand Slam he lost 1–5 to Dave Chisnall in his opening group game, but then averaged 100.60 in eliminating two-time world champion Adrian Lewis 5–1, and defeated Rodriguez 5–3 to reach the last 16. He faced five-time world champion Raymond van Barneveld and raced into a 9–3 lead to stand just one leg away from the quarter-finals in his first televised event. However, Brown missed a total of five match darts as Van Barneveld closed the gap to 9–7, before he missed three darts in the next leg to allow Brown in to take out 122 on the bull to seal a 10–7 win. He also started well in the last eight against Dave Chisnall, as he held 8–2 and 12–6 leads. However, Brown could not hold on when his opponent began fighting back as Chisnall levelled at 14–14 and ended Brown's tournament with a 14–16 win.