Brown was drawn to face John Part in the first round of the 2015 World Championship, with the match going into a final set after Brown had led 2–0. He took it without reply to win 3–2 and advance to the second round. There, five of the six sets against Adrian Lewis went to deciding legs, with Lewis getting the better of Brown in a 4–2 win. He entered the top 64 on the Order of Merit for the first time afterwards, as the world number 52. Brown was named the PDC's Young Player of the Year at the annual awards dinner. He lost 2–9 to Nathan Derry in the third round of the UK Open. Brown reached the final of the eighth Players Championship and took out a pair of 130 finishes as he averaged 111.72 in defeating Lewis 6–3 to claim his first professional title.